阅读说明：本技术 拍照记录测量结果的酒精检测仪计量检定方法 (Alcohol detector metrological verification method capable of recording measurement results through photographing ) 是由 王一民 施江焕 王维峰 秦树伟 潘卫江 于 2021-07-26 设计创作，主要内容包括：本发明提供一种拍照记录测量结果的酒精检测仪计量检定方法,将酒精检测仪检定装置及视觉识别装置均与电脑进行通信连接,从而实现数据通信。所述电脑上的管理系统软件因此能够获取酒精检测仪检定装置的吹气口输出的标准酒精气体的浓度值,以及视觉识别装置所拍摄的读数值图像。检定人员根据该读数值图像识别出读数值。可以得出更为精确的标准酒精气体浓度值,另一方面,将读数值图像记录在管理系统软件上,既可以方便检定人员人工识别测量结果得出读数值,又可以作为测量结果的原始证据,保证了检定报告的权威性,且可以防止人为修改检定结果。(The invention provides an alcohol detector metrological verification method for recording measurement results by taking pictures, which is characterized in that an alcohol detector verification device and a visual recognition device are in communication connection with a computer, so that data communication is realized. The management system software on the computer can obtain the concentration value of the standard alcohol gas output by the air blowing port of the alcohol detector calibrating device and the reading value image shot by the visual recognition device. The reading value is identified by the verification personnel according to the reading value image. On the other hand, the reading value image is recorded on the management system software, so that the calibrating personnel can conveniently identify the measuring result manually to obtain the reading value, the reading value can also be used as the original evidence of the measuring result, the authority of the calibrating report is ensured, and the calibrating result can be prevented from being manually modified.)

1. The alcohol detector metrological verification method for recording measurement results by taking pictures is characterized by comprising the following steps of:

step S1, providing an alcohol detector (100) to be verified, an alcohol detector verification device (200), a visual recognition device (300) and a computer (400); the alcohol detector calibrating device (200) and the visual recognition device (300) are in communication connection with a computer (400);

the alcohol detector (100) to be calibrated comprises a display screen (101) for displaying the reading of the measurement result;

the alcohol detector calibrating device (200) comprises an air blowing port and can output standard alcohol gas;

the visual recognition device (300) is used for shooting a reading value image displayed on a display screen (101) of the alcohol detector (100) to be calibrated;

the computer (400) is provided with a management system software (410), the management system software (410) can acquire the concentration value of the standard alcohol gas before blowing, can also acquire a reading value image from the visual recognition device (300), and records the concentration value and the reading value image of the standard alcohol gas on the management system software (410);

step S2, setting the concentration and blowing parameters of standard alcohol gas on the alcohol detector calibrating device (200);

s3, placing the alcohol detector (100) to be verified at the air blowing port of the alcohol detector verification device (200), and acquiring the concentration value of standard alcohol gas output by the air blowing port before air blowing by the management system software (410);

step S4, starting the alcohol detector calibrating device (200) to start blowing, displaying the reading of the measuring result on the display screen (101) of the alcohol detector (100) to be calibrated after the blowing is finished, and shooting the reading value image displayed on the display screen (101) of the alcohol detector (100) to be calibrated by the visual recognition device (300);

step S5, the management system software (410) obtains the reading value image of the alcohol detector (100) to be verified from the visual recognition device (300) and records the reading value image on the management system software (410);

step S6, repeating the steps S2-S5 to measure for a plurality of times, identifying the reading value on the management system software (410) by a verification person according to the reading value image, and inputting the reading value into the management system software (410);

and step S7, the management system software (410) automatically analyzes the indication absolute error and the indication relative error of each measurement, automatically analyzes the verification result according to the results of several measurements, and further automatically generates a verification report of the indication error.

2. The alcohol tester metrological verification method of taking a picture to record the measurement results as claimed in claim 1, wherein said alcohol tester verification device (200) is in communication connection with the computer (400) by wire or wirelessly, and said visual recognition device (300) is in communication connection with the computer (400) by wire or wirelessly.

3. The alcohol detector metrological verification method of photographing and recording measurement results of claim 2, wherein the wired means includes a serial data interface, a USB interface, or a network interface, and the wireless means includes bluetooth, WIFI, infrared, 4G, or 5G.

4. The alcohol meter metrological verification method of taking a picture to record the measurement as claimed in claim 2, characterized in that said visual recognition means (300) comprises a base (1), and an alcohol meter adapter (2) and a camera assembly (3) mounted on the base (1); the base (1) comprises an installation plate (11) for installing the alcohol detector adapter seat (2) and the camera assembly (3); the alcohol detector adapting seat (2) is used for placing an alcohol detector (100) to be detected;

the camera assembly (3) comprises a vertical rod supporting seat (31), a camera support (32), a vertical optical axis positioning seat (33), a camera connecting plate (34) and a camera (35); the vertical rod supporting seat (31) is arranged on the mounting plate (11); one end of the camera support (32) is connected with the vertical rod supporting seat (31), and the other end of the camera support is connected with the vertical optical axis positioning seat (33); the camera (35) is connected with the vertical optical axis positioning seat (33) through the camera connecting plate (34); the camera (35) is positioned above the display screen (101) of the alcohol detector (100) to be calibrated and is used for shooting a reading value image displayed by the display screen (101) of the alcohol detector (100) to be calibrated;

the camera (35) is in communication connection with the computer (400) in a wired mode or a wireless mode, and then the management system software (410) on the computer (400) can obtain the reading value image shot by the camera (35) and record the reading value image on the management system software (410).

5. The alcohol meter metrological verification method of taking a picture to record the measurement result as claimed in claim 4, wherein said alcohol meter fitting seat (2) includes a housing groove (21) adapted to the outer shape of the alcohol meter (100) to be verified for housing the alcohol meter (100) to be verified; the alcohol detector (100) to be verified is placed on the accommodating groove (21) and cannot move relatively.

6. The alcohol tester metrological verification method of taking a picture to record the measurement result as claimed in claim 5, wherein the alcohol tester adaptation seat (2) is provided with a plurality of magnets (4), the mounting plate (11) is also provided with a plurality of magnets (4) at corresponding positions, and the mutual attraction of the magnets (4) ensures that the alcohol tester adaptation seat (2) is fixed on the mounting plate (11) and does not move relatively.

7. The alcohol detector metrological verification method of taking a picture and recording the measurement result as claimed in claim 6, wherein the bottom of said housing groove (21) is provided with a plurality of recesses (211), and a plurality of magnets (4) are correspondingly positioned in the plurality of recesses (211); the alcohol detector is characterized in that a plurality of magnet fixing blocks (111) are arranged at corresponding positions on the mounting plate (11), a magnet (4) is fixedly mounted on each magnet fixing block (111), and the alcohol detector adapting seat (2) is guaranteed to be fixed on the mounting plate (11) through mutual attraction of the magnets (4), so that relative movement cannot occur.

8. The alcohol tester metrological verification method of taking a picture to record the measurement result as claimed in claim 7, wherein the bottom of the alcohol tester adaptation seat (2) is further provided with a positioning hole (22), and a corresponding position on the magnet fixing block (111) is provided with a positioning post (112) matched with the positioning hole (22), thereby realizing the positioning of the alcohol tester adaptation seat (2) on the mounting plate (11).

9. The alcohol detector metrological verification method of photographing and recording measurement results of claim 1, wherein said step S4 further comprises: the alcohol detector calibrating device (200) transmits a trigger signal to the management system software (410) within a preset time interval after the end of blowing, and the management system software (410) controls the visual recognition device (300) to shoot after receiving the trigger signal.

10. The alcohol detector metrological verification method of photographing and recording measurement results according to claim 1, wherein the standard alcohol gas outputted from the gas blowing port is derived from a steel cylinder of the standard alcohol gas or a standard alcohol gas generated by an alcohol generating source device;

in the step S2, the blowing parameters include blowing time and blowing flow rate;

the concentration of the standard alcohol gas is 0.1mg/L, 0.4mg/L or 0.6 mg/L; the air blowing time is 6 seconds, and the air blowing flow is 15L/min;

in the step S6, the number of times of repeating the steps S2-S5 is 10;

in the step S7, the management system software (410) automatically calculates the absolute error and relative error of the indication value for each measurement according to the equations (a) and (b);

ΔC＝C-C₀ (a)

in the formula: delta C is an absolute error of an indication value, mg/L;

ΔC_ris an indication of relative error;

c is the reading value of the alcohol detector (100) to be detected, mg/L;

C₀the concentration value of the standard alcohol gas output by the air blowing port is mg/L;

in the step S7, the management system software (410) automatically calculates an average value of the indication absolute errors and an average value of the indication relative errors according to the indication absolute errors and the indication relative errors measured several times, thereby automatically generating a verification report of the indication errors.

Technical Field

The invention relates to the technical field of verification of expired gas alcohol content detectors, in particular to a metrological verification method of an alcohol detector for photographing and recording measurement results.

Background

An alcohol content detector of expired gas, called an alcohol detector for short, is a tool for traffic police law enforcement, belongs to a measuring instrument, and can be used for law enforcement only if the alcohol detector is verified by a measuring department and obtains a verification certificate.

When the metering department performs metering detection on the alcohol detector, the metering detection procedure of the alcohol detector is required (JJG 657-. According to the requirements of the regulation, the standard alcohol gas is needed in the verification process, and is generally derived from the first-grade standard gas contained in a steel bottle or the standard alcohol gas generated by an ethanol generating source device, wherein the indication error (including the indication absolute error and the indication relative error) is measured as follows:

1. setting the standard alcohol gas concentration C on the calibrating device₀For example, 0.600 mg/L;

2. setting blowing parameters such as blowing time, blowing flow and the like on the calibrating device, wherein the blowing flow is 15L/min and the blowing time is 6 seconds;

3. connecting the alcohol detector to an air blowing port of the calibrating device, and starting an air blowing process;

4. if the air blowing is successful, the alcohol detector displays a reading C, such as 0.605mg/L, and the reading is recorded;

5. repeating the above 1-4 processes for measuring again after the alcohol detector returns to zero for 10 times, and averaging

6. Calculating the absolute error Delta C and the relative error Delta C of the indication value of each concentration point according to the formula (1) or the formula (2)_r。

In the formula: delta C is an absolute error of an indication value, mg/L;

ΔC_ris an indication of relative error;

the arithmetic mean value of 10 measurement indications of the alcohol detector is mg/L;

C₀the concentration value of the ethanol standard gas introduced into the alcohol detector is mg/L.

In the process, the calibrating personnel needs to frequently record the reading on the alcohol detector, if the reading is missed, the historical record on the alcohol detector needs to be browsed for additional recording, the recording process is possible to be wrongly recorded, and theoretically, the calibrating personnel also needs to record the standard alcohol gas concentration C on the calibrating device every time the calibrating personnel blows₀Because the concentration C is the same as the first standard gas if the cylinder is filled with the first standard gas₀Will vary with the outlet temperature and atmospheric pressure; or concentration C if the source of the generation is a device₀Will vary with the outlet temperature, atmospheric pressure and process of production. That is, the standard alcohol gas concentration C on the assay device₀Minor variations are possible. Thus, if the calibrating personnel only record the standard alcohol gas concentration C at the very beginning of the calibrating device₀Without being updated at any time, the indication error ac for each measurement may not be accurate. Thus, the examiner needs to record 10 alcohol test readings and 10 standard alcohol gas concentrations. The detection protocol also specifies other measurement items, for example, the subsequent detection needs to measure repeatability and memory residual effect in addition to the indication error measurement, so that the indication errors need to be three, namely 0.1mg/L, 0.4mg/L and 0.6mg/LThe concentration is measured 10 times, the repeatability needs to be measured 10 times by using the concentration of 0.4mg/L, the memory residue effect needs to be measured 10 times by using the concentration of 0.1mg/L, then measured 1 time by using the concentration of 0.4mg/L, and finally measured 1 time by using the concentration of 0.1 mg/L. Therefore, if the alcohol is measured according to the above test items according to the office work, a complete metrological verification measurement process requires 52 exhaled breath measurements on the detected alcohol detector on the verification device in total, and during or after the measurement, the verification personnel must copy the measurement results on the alcohol detector onto paper or computer software, and obtain a verification report after statistical analysis according to the concentration of the standard alcohol gas and the measurement results of the alcohol detector set on the verification device, so as to obtain a verification result of passing or failing, therefore, the conventional verification method is complicated in process and prone to errors. In addition, manual transcription is not only easy to make mistakes, but also provides convenience for arbitrarily modifying detection results, at present, electronic management of metrological verification is greatly promoted, and the electronic alcohol detection measurement also requires automation of the detection process to prevent the occurrence of arbitrarily modifying behaviors, so that improvement is needed.

Disclosure of Invention

The invention aims to provide an alcohol detector metrological verification method for recording measurement results by taking pictures, which records a reading value image on management system software, can not only facilitate verification personnel to manually identify and obtain a reading value, but also ensure the authority of a verification report and prevent verification results from being manually modified.

In order to achieve the aim, the invention provides a metrological verification method of an alcohol detector for recording measurement results by taking pictures, which comprises the following steps:

step S1, providing an alcohol detector to be detected, an alcohol detector detecting device, a visual recognition device and a computer; the alcohol detector calibrating device and the visual recognition device are both in communication connection with a computer;

the alcohol detector to be calibrated comprises a display screen for displaying the reading of the measurement result;

the alcohol detector calibrating device comprises an air blowing port and can output standard alcohol gas;

the visual recognition device is used for shooting a reading value image displayed on a display screen of the alcohol detector to be calibrated;

the computer is provided with a management system software, the management system software can acquire the concentration value of the standard alcohol gas before blowing, can also acquire a reading value image from the visual recognition device, and records the concentration value and the reading value image of the standard alcohol gas on the management system software;

step S2, setting the concentration and blowing parameters of standard alcohol gas on the alcohol detector calibrating device;

s3, placing the alcohol detector to be detected at the air blowing port of the alcohol detector detecting device, and acquiring the concentration value of the standard alcohol gas output by the air blowing port before air blowing by the management system software;

step S4, starting the alcohol detector calibrating device to blow air, displaying the reading of the measuring result on the display screen of the alcohol detector to be calibrated after the air blowing is finished, and shooting the reading value image displayed on the display screen of the alcohol detector to be calibrated by the visual recognition device;

step S5, the management system software obtains the reading value image of the alcohol detector to be verified from the visual recognition device and records the reading value image on the management system software;

s6, repeating the steps S2-S5 to measure for a plurality of times, identifying the reading value on the management system software by a verification person according to the reading value image, and inputting the reading value into the management system software;

and step S7, the management system software automatically analyzes the indication absolute error and the indication relative error of each measurement, automatically analyzes the results of several measurements to obtain a verification result, and further automatically generates a verification report of the indication error.

The alcohol detector calibrating device is in communication connection with a computer in a wired mode or a wireless mode, and the visual recognition device is in communication connection with the computer in a wired mode or a wireless mode.

The wired mode comprises a serial data interface, a USB interface or a network interface, and the wireless mode comprises Bluetooth, WIFI, infrared, 4G or 5G.

The visual recognition device comprises a base, and an alcohol detector adapter and a camera assembly which are arranged on the base; the base comprises a mounting plate for mounting the alcohol detector adapter and the camera assembly; the alcohol detector adapting seat is used for placing an alcohol detector to be verified;

the camera component comprises a vertical rod supporting seat, a camera support, a vertical optical axis positioning seat, a camera connecting plate and a camera; the vertical rod supporting seat is arranged on the mounting plate; one end of the camera support is connected with the vertical rod supporting seat, and the other end of the camera support is connected with the vertical optical axis positioning seat; the camera is connected with the vertical optical axis positioning seat through the camera connecting plate; the camera is positioned above the display screen of the alcohol detector to be calibrated and is used for shooting a reading value image displayed on the display screen of the alcohol detector to be calibrated;

the camera is in communication connection with the computer in a wired mode or a wireless mode, and then management system software on the computer can obtain a numerical reading value image shot by the camera and record the numerical reading value image on the management system software.

The alcohol detector adapting seat comprises an accommodating groove which is adapted to the shape of the alcohol detector to be calibrated and used for accommodating the alcohol detector to be calibrated; the alcohol detector to be detected is placed on the accommodating groove and cannot move relatively.

Be equipped with several magnet on the alcohol detector adaptation seat, also be equipped with several magnet on the mounting panel corresponds the position, guarantee that alcohol detector adaptation seat fixes on the mounting panel through the mutual actuation of magnet, can not take place relative movement.

A plurality of grooves are formed in the bottom of the accommodating groove, and a plurality of magnets are correspondingly positioned in the grooves; the mounting panel is gone up corresponding position and is equipped with several magnet fixed block, magnet of fixed mounting on every magnet fixed block, guarantees through the mutual actuation of magnet that alcohol detector adaptation seat is fixed on the mounting panel to relative movement can not take place.

The bottom of alcohol detector adaptation seat still is equipped with the locating hole, the last corresponding position of magnet fixed block is equipped with the reference column that pairs with the locating hole to realize the location of alcohol detector adaptation seat on the mounting panel.

The step S4 further includes: the alcohol detector calibrating device transmits a trigger signal to the management system software within a preset time interval after the air blowing is finished, and the management system software receives the trigger signal and then controls the visual recognition device to shoot.

The standard alcohol gas output by the air blowing port is derived from the standard alcohol gas in a steel cylinder or the standard alcohol gas generated by an ethanol generating source device;

in the step S2, the blowing parameters include blowing time and blowing flow rate;

the concentration of the standard alcohol gas is 0.1mg/L, 0.4mg/L or 0.6 mg/L; the air blowing time is 6 seconds, and the air blowing flow is 15L/min;

in the step S6, the number of times of repeating the steps S2-S5 is 10;

in step S7, the management system software automatically calculates the absolute error and relative error of the indication value for each measurement according to the equations (a) and (b);

ΔC＝C-C₀ (a)

in the formula: delta C is an absolute error of an indication value, mg/L;

ΔC_ris an indication of relative error;

c is the reading value of the alcohol detector to be detected, mg/L;

C₀the concentration value of the standard alcohol gas output by the air blowing port is mg/L;

in step S7, the management system software automatically calculates an average value of the indication absolute errors and an average value of the indication relative errors according to the indication absolute errors and the indication relative errors measured several times, thereby automatically generating a verification report of the indication errors.

The invention has the beneficial effects that: the invention provides an alcohol detector metrological verification method for recording measurement results by taking pictures, which is characterized in that an alcohol detector verification device and a visual recognition device are in communication connection with a computer, so that data communication is realized. The management system software on the computer can obtain the concentration value of the standard alcohol gas output by the air blowing port of the alcohol detector calibrating device and the reading value image shot by the visual recognition device. The reading value is identified by the verification personnel according to the reading value image. On the other hand, the reading value image is recorded on the management system software, so that the calibrating personnel can conveniently identify the measuring result manually to obtain the reading value, the reading value can also be used as the original evidence of the measuring result, the authority of the calibrating report is ensured, and the calibrating result can be prevented from being manually modified.

Drawings

For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.

In the drawings, there is shown in the drawings,

FIG. 1 is a flow chart of the alcohol detector metrological verification method of the present invention taking a picture to record the measurement results;

FIG. 2 is a block diagram showing the connection relationship between the alcohol detector to be calibrated, the alcohol detector calibrating device, the visual recognition device and the computer according to the present invention;

FIG. 3 is a perspective view of the visual identification device of the present invention;

FIG. 4 is an exploded view of the visual identification device of the present invention;

FIG. 5 is a schematic view of the alcohol detector adapter and the vertical rod support base of the present invention mounted on a mounting plate;

FIG. 6 is a cross-sectional view of the mounting and positioning of the alcohol detector adapter on the base.

Detailed Description

To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Referring to fig. 1, the invention provides a metrological verification method for an alcohol detector by photographing and recording measurement results, comprising the following steps:

step S1, as shown in fig. 2, providing an alcohol tester 100 to be tested, an alcohol tester testing device 200, a visual recognition device 300 and a computer 400; the alcohol detector calibrating device 200 and the visual recognition device 300 are both in communication connection with a computer 400;

as shown in fig. 3 and 4, the alcohol detector 100 to be calibrated includes a display screen 101 for displaying the reading of the measurement result.

The alcohol detector calibrating device 200 comprises an air blowing port and can output standard alcohol gas.

The visual recognition device 300 is used to capture an image of the readings (i.e., a digital photograph or video containing the alcohol content) displayed on the display screen 101 of the alcohol detector 100 to be calibrated.

The computer 400 is provided with a management system software 410, the management system software 410 can acquire the concentration value of the standard alcohol gas before blowing, can also acquire a numerical reading image from the visual recognition device 300, and records the concentration value of the standard alcohol gas and the numerical reading image on the management system software 410;

specifically, the alcohol detector calibrating device 200 is in communication connection with the computer 400 in a wired or wireless manner, and the visual recognition device 300 is in communication connection with the computer 400 in a wired or wireless manner.

The wired mode includes but is not limited to a serial data interface, a USB interface, or a network interface, etc.

The wireless mode includes but is not limited to bluetooth, WIFI, infrared, 4G, or 5G.

The standard alcohol gas output by the air blowing port is derived from the standard alcohol gas in a steel cylinder or the standard alcohol gas generated by an ethanol generating source device. Although this is not a limitation of the present invention, one skilled in the art can select a suitable standard alcohol gas source according to actual needs.

Step S2, setting the concentration and blowing parameters of the standard alcohol gas on the alcohol detector calibrating device 200;

specifically, the blowing parameters include blowing time and blowing flow.

Optionally, the concentration of the standard alcohol gas is 0.1mg/L, 0.4mg/L or 0.6 mg/L; the air blowing time is 6 seconds, and the air blowing flow is 15L/min.

Step S3, placing the alcohol detector 100 to be verified at the air blowing port of the alcohol detector verification device 200, and acquiring the concentration value of the standard alcohol gas output by the air blowing port before air blowing by the management system software 410;

specifically, the management system software 410 performs data communication by sending a command to the alcohol detector calibrating apparatus 200, so as to obtain the concentration value of the standard alcohol gas output from the air blowing port before air blowing.

Step S4, starting the alcohol detector calibrating device 200 to start blowing, after the blowing is finished, displaying a reading of a measurement result on the display screen 101 of the alcohol detector 100 to be calibrated, and shooting a reading value image displayed on the display screen 101 of the alcohol detector 100 to be calibrated by the visual recognition device 300;

specifically, in step S4, the air blowing process may be started by activating a control button on the alcohol detector calibrating device 200; the management system software 410 may also control the alcohol testing device 200 to initiate the insufflation process by issuing commands to the alcohol testing device 200.

Step S5, the management system software 410 obtains the reading value image of the alcohol detector 100 to be certified from the visual recognition device 300, and records the reading value image on the management system software 410;

step S6, repeating the steps S2-S5 to measure for a plurality of times, identifying the reading value on the management system software 410 by a verification personnel according to the reading value image, and inputting the identified reading value into the management system software 410;

specifically, according to the requirements of the assay protocol, in the measurement of the indication error, 10 measurements are required each with the concentration of the standard alcohol gas set to 0.1mg/L, 0.4mg/L, or 0.6mg/L, to obtain the indication error. Therefore, in the step S6, the number of times of repeating the steps S2 to S5 is 10.

Step S7, the management system software 410 automatically analyzes the indication absolute error and the indication relative error of each measurement, and automatically analyzes the results of several measurements to obtain a verification result, thereby automatically generating a verification report of the indication error.

Specifically, the management system software 410 automatically calculates the absolute error and relative error of the indication value for each measurement according to the equations (a) and (b).

ΔC＝C-C₀ (a)

In the formula: delta C is an absolute error of an indication value, mg/L;

ΔC_ris an indication of relative error;

c is the reading value of the alcohol detector 100 to be detected, mg/L;

C₀the concentration value of the standard alcohol gas output by the air blowing port is mg/L.

Specifically, the management system software 410 automatically calculates an average value of the indication absolute errors and an average value of the indication relative errors according to the indication absolute errors and the indication relative errors measured several times, thereby automatically generating a verification report of the indication errors.

It can be understood that the measurement result (i.e., the reading value) of the alcohol detector may also be connected to the computer in a wired or wireless manner, so as to upload the measurement result to the management system software of the computer. However, the alcohol detector manufacturer needs to provide an interface communication protocol and the alcohol detector needs to have the function; for alcohol detectors without communication interface protocol or this function, the reading value on the alcohol detector can be obtained by visual identification. Machine vision technology has been used to identify characters, numbers and letters, and generally includes hardware devices (vision recognition means) and recognition software. The hardware equipment is mainly a camera or a camera, the identification software is open and commercially applied, and numbers, letters and characters on a shot image are identified by adopting various algorithms. The working process is as follows: firstly, the numbers, letters and characters to be identified are photographed or photographed, and then the pictures or videos are subjected to image processing through a software algorithm to obtain output results of the numbers, letters and characters. Therefore, a special algorithm is needed for visual recognition, and the recognition accuracy of the algorithm is high, otherwise, if the recognition is wrong, a wrong verification report is caused, and the current recognition algorithm cannot achieve 100% accuracy, so that the problem of the recognition rate needs to be solved by adopting an automatic recognition method. Therefore, the method adopts a method of firstly shooting to obtain a reading value image on a display screen of the alcohol detector and then manually identifying the reading value image to replace the method of manually recording the measurement result in the prior art.

Specifically, as shown in fig. 3 and 4, in the present invention, the visual recognition apparatus 300 includes a base 1, and an alcohol tester adapter 2 and a camera assembly 3 mounted on the base 1. The base 1 comprises a mounting plate 11 for mounting the alcohol detector adapter 2 and the camera assembly 3. The alcohol detector adapting seat 2 is used for placing an alcohol detector 100 to be verified.

The camera assembly 3 includes a vertical rod support seat 31, a camera support 32, a vertical optical axis positioning seat 33, a camera connecting plate 34, and a camera 35.

The vertical rod support seat 31 is mounted on the mounting plate 11; one end of the camera support 32 is connected with the vertical rod support seat 31, and the other end is connected with the vertical optical axis positioning seat 33; the camera 35 is connected to the vertical optical axis positioning seat 33 through the camera connecting plate 34. The camera 35 is located above the display screen 101 of the alcohol detector 100 to be calibrated, and is configured to capture a reading image displayed on the display screen 101 of the alcohol detector 100 to be calibrated.

The camera 35 is in communication connection with the computer 400 in a wired or wireless manner, and the management system software 410 on the computer 400 can obtain the numerical reading image shot by the camera 35 and record the numerical reading image on the management system software 410. In an alternative embodiment of the present invention, the camera 35 is communicatively connected to the computer 400 through the USB data cable 6, so as to perform data communication.

Preferably, the camera support 32 is "L" shaped to facilitate positioning the camera 35 over a reading image displayed on the display screen 101 of the alcohol meter 100 to be calibrated.

Further, in order to make the reading value image captured by the camera 35 clearer, the camera 35 should be located right above the reading value image displayed on the display screen 101 of the alcohol detector 100 to be calibrated, and the height and the position of the camera 35 may need to be adjusted arbitrarily. The camera support 32 is therefore preferably a gooseneck, which can be bent at will to adjust the position and height of the camera 35 and thus take a clear image of the reading.

Specifically, the base 1 may further include a button (not shown) for controlling the camera 35 to be turned on, the camera 35 may be started to perform a shooting operation when the button is pressed, and then the management system software 410 obtains a reading value image shot by the camera 35.

Of course, if the camera 35 or the management system software 410 can automatically recognize that the display screen 101 of the alcohol testing apparatus 100 to be calibrated has displayed the reading of the measurement result, it is not necessary to set a button to control the turning on of the camera 35, and the camera 35 (or the management system software 410 controls the turning on of the camera 35) can automatically capture the image of the reading displayed on the display screen 101 of the alcohol testing apparatus 100 to be calibrated.

It should be noted that, because the alcohol tester is connected to the computer, the alcohol tester can know the start and end times of the air blowing. And after the air blowing of the alcohol detector calibrating device is finished, the alcohol detector to be calibrated can display the reading in 20 seconds, so that the camera can be controlled to start shooting by taking the time point of the air blowing of the alcohol detector calibrating device as the trigger time.

Therefore, in an alternative embodiment of the present invention, the alcohol testing device 200 transmits a trigger signal to the management system software 410 within a preset time interval after the end of the air blowing, and the management system software 410 receives the trigger signal and controls the camera 35 of the visual recognition device 300 to take a picture. Preferably, the preset time interval is 20 seconds.

In order for the calibrating personnel to be able to clearly distinguish the reading value of the measurement result from each reading value image, it is preferable to place the alcohol detector to be calibrated in a fixed position below the camera. That is, the reading value displayed on the display screen of the alcohol tester (e.g., the alcohol content value 75, the unit BAC mg/100ml) is preferably located at the center of the reading value image captured by the camera, so as to avoid the situation that the reading value in the captured reading value image cannot be completely displayed (i.e., the reading value is not completely displayed, e.g., the upper left half of "75" cannot be captured and is easily mistakenly recognized as "15"). When the alcohol detector is checked, a batch of alcohol detectors with the same model are checked, therefore, in the checking process of the alcohol detectors with the same model, the displayed alcohol content areas are preferably located at the same position in the reading value image (photo or video), so that a complete reading value can be ensured, and the alcohol detectors can be identified quickly by checking personnel. Therefore, the position of the camera can be set only once, so that the verification of the batch of alcohol detectors with the same model can be completed, and the position of the camera does not need to be adjusted before each verification. However, if the calibrating staff holds the calibrating instrument to perform the calibration, the positions of the areas of the alcohol content displayed by different alcohol detectors of the same model on the reading value image are different, so that the situation that the reading value is displayed incompletely may occur, and the reading value identification of the calibrating staff is further influenced.

For the same type (namely the same model) of alcohol detector, the calibration can be completed by setting the positions of the camera and the alcohol detector to be calibrated for one time. Therefore, in the present invention, as shown in fig. 4, the alcohol tester adapter 2 includes a receiving groove 21 adapted to the shape of the alcohol tester 100 to be tested, for receiving the alcohol tester 100 to be tested. The alcohol detector 100 to be calibrated is placed on the accommodating groove 21 and does not move relatively.

As shown in fig. 5, the alcohol tester adapter seat 2 is provided with a plurality of magnets 4, the mounting plate 11 is also provided with a plurality of magnets 4 at corresponding positions, and the alcohol tester adapter seat 2 is ensured to be fixed on the mounting plate 11 through mutual attraction of the magnets 4, so that relative movement cannot occur.

In an alternative embodiment of the present invention, the bottom of the accommodating groove 21 is provided with a plurality of grooves 211, and the plurality of magnets 4 are correspondingly located in the plurality of grooves 211. The last corresponding position of mounting panel 11 is equipped with several magnet fixed block 111, and magnet 4 of fixed mounting on every magnet fixed block 111 guarantees through the mutual attraction of magnet 4 that alcohol detector adaptation seat 2 fixes on mounting panel 11 to relative movement can not take place.

Further, as shown in fig. 6, a positioning hole 22 is further formed in the bottom of the alcohol tester adapter seat 2, and a positioning column 112 matched with the positioning hole 22 is disposed at a corresponding position on the magnet fixing block 111, so that the alcohol tester adapter seat 2 is positioned on the mounting plate 11.

In other embodiments of the invention, a positioning column may be arranged at the bottom of the alcohol detector adapter seat, and a positioning hole matched with the magnet fixing block is arranged on the magnet fixing block, so that the alcohol detector adapter seat can be positioned on the mounting plate.

The alcohol detector adapter seat is provided with the accommodating groove which is matched with the shape of the alcohol detector, so that the alcohol detector is just placed on the accommodating groove and cannot move relatively. And alcohol content appearance adaptation seat and camera subassembly are all fixed mounting on the mounting panel of base, and the camera of camera subassembly is located the display screen of alcohol content appearance directly over, and the camera is just showing the regional (numerical reading) of alcohol content on this alcohol content appearance's display screen promptly, because the regional fixed unchangeable of showing alcohol content on the display screen of alcohol content appearance. Therefore, the display content on the display screen of the alcohol detector on the market does not change greatly, the camera can shoot a reading value image after the alcohol detector is placed on the alcohol detector adapting seat, the area (reading value) for displaying the alcohol content can be always located at the central position after the management system software acquires the reading value image, and verification personnel can clearly and completely see the reading value, so that the verification personnel can identify the alcohol detector. In the invention, the alcohol detector adaptive seat and the mounting plate of the base are positioned through the positioning columns and the positioning holes, namely, the different alcohol detector adaptive seats are associated with the camera through the positioning columns/the positioning holes, so that an area (reading value) displaying the alcohol content in a reading value image shot by the camera can be always ensured to be positioned at the central position, and a calibrating worker can clearly and completely see the reading value, thereby being capable of identifying the alcohol detector.

It should be noted that, in the prior art, the calibrating personnel need to look over the history record after the whole detection process is completed, and input all the measurement results of the alcohol detector to be calibrated into the management system software of the computer for statistical analysis; or the calibration personnel need to record a reading value by using a pen every time of measurement, and then input the reading value into the management system software of the computer for statistical analysis. When the former looks over the history record, the reading values in the history record are easy to be mixed due to the fact that the difference between the front and back measurement results is not large; in the latter case, if the reading value of a certain measurement result is not recorded in time by a verification person due to various reasons in the measurement process, the historical record needs to be reviewed afterwards, and the situation of error recording is easy to occur. In the invention, after each measurement (the reading is displayed on the display screen of the alcohol detector to be calibrated), the camera of the visual recognition device shoots a reading value image and uploads the reading value image to the management system software of the computer, and the management system software records the reading value image. The method and the device can not only facilitate the subsequent manual identification of the measurement result, but also serve as the original evidence of the measurement result, prevent the verification result from being manually modified, and ensure the authority of the verification report.

In summary, the invention provides a metrological verification method for an alcohol detector by photographing and recording measurement results, wherein a verification device and a visual recognition device of the alcohol detector are both in communication connection with a computer, so that data communication is realized. The management system software on the computer can obtain the concentration value of the standard alcohol gas output by the air blowing port of the alcohol detector calibrating device and the reading value image shot by the visual recognition device. The reading value is identified by the verification personnel according to the reading value image. On the other hand, the reading value image is recorded on the management system software, so that the calibrating personnel can conveniently identify the measuring result manually to obtain the reading value, the reading value can also be used as the original evidence of the measuring result, the authority of the calibrating report is ensured, and the calibrating result can be prevented from being manually modified.

As described above, it will be apparent to those skilled in the art that various other changes and modifications can be made based on the technical solution and the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the appended claims.