阅读说明：本技术 一种基于复合传感器的航空煤油浓度检测方法及装置 (Aviation kerosene concentration detection method and device based on composite sensor ) 是由 包新月 汪箭 朱霁平 于 2020-12-24 设计创作，主要内容包括：本发明公开了一种基于复合传感器的航空煤油浓度检测方法及装置,具有高响应速度、高灵敏度、抗干扰性小和检测数据准确可靠的特点,设计了基于复合传感器的煤油浓度便携式预警装置,包括以下检测步骤组成,步骤一、利用传感器检测单元对煤油浓度进行同步检测,实现半导体传感器模组和红外传感器模组同步的对煤油蒸汽进行检测,步骤二、利用复合判定单元对感器检测单元的结果进行判定输出,实现对煤油蒸汽快速响应的同时得到高精度的检测数据,步骤三、一体化预警单元通过与复合判定单元的数据传输,实现煤油浓度信息实时监测和预警。本发明综合复合传感设计与判定技术,结合预警单元,实现了应用于航空煤油运输渠道中的便携式预警装置。(The invention discloses an aviation kerosene concentration detection method and device based on a composite sensor, which have the characteristics of high response speed, high sensitivity, small anti-interference performance and accurate and reliable detection data. The portable early warning device is applied to aviation kerosene transportation channels by integrating composite sensing design and judgment technology and combining the early warning unit.)

1. A aviation kerosene concentration detection method based on a composite sensor is characterized by comprising the following steps:

step 1: synchronously detecting the concentration of the kerosene steam by using a sensor detection unit; the sensor detection unit refers to a semiconductor sensor module and an infrared sensor module; the synchronous detection means that two different sensor modules synchronously detect the kerosene steam;

step 2: the composite judgment unit is used for judging and outputting the result of the sensor detection unit, and the composite judgment unit is used for acquiring and compositely judging the sensor signal of the sensor detection unit, so that the kerosene concentration is quickly responded and accurate metering data is given;

and step 3: the integrated early warning unit realizes early warning through data transmission with the composite judgment unit, the integrated early warning unit realizes real-time display of kerosene steam concentration and graded early warning, and the graded early warning refers to different degrees of warning modes set according to explosion limits;

the sensor detection unit includes: the infrared sensor module comprises a semiconductor sensor module and an infrared sensor module; the semiconductor sensor module develops a micro-nano film on an MEMS (micro-electromechanical system) microplate, and is a micro-nano film type gas-sensitive sensor based on an MEMS micro heater, kerosene steam passes through the semiconductor sensor module, the resistance value of the micro-nano film type gas-sensitive sensor generates corresponding oscillation due to the weak change of the concentration of the kerosene steam, and the current concentration of the kerosene steam is detected by obtaining the resistance value of the sensor through oscillation frequency; the infrared sensor module is a gas sensor based on an NDIR infrared absorption principle, and comprises a light source which is made for kerosene steam and has an obvious C-H bond absorption effect, an optical cavity, a dual-channel detector and a microprocessor, wherein after the light source is absorbed by the optical cavity with a certain length, the intensity of the light source which penetrates through the gas sensor based on the NDIR infrared absorption principle is monitored, so that the concentration of the kerosene steam is represented, the microprocessor carries out signal acquisition, processing and output, and meanwhile, a temperature sensor is arranged in the gas sensor for carrying out temperature compensation, so that the detection precision of the sensor is improved;

the composite judgment unit realizes signal acquisition and composite judgment of the dual-mode composite sensor; the signal acquisition of the dual-mode composite sensor comprises the following steps: acquiring signals of a semiconductor sensor module and acquiring signals of an infrared sensor module;

the integrated early warning unit comprises: the device comprises a main control chip, an alarm module, an LCD module and a power supply module; the main control chip adopts a microcontroller internally integrated with an A/D converter and an LCD driver to realize data processing of processing unit signals and function control of other modules; the alarm module consists of an LED alarm lamp, a buzzer and a vibrator, and has sound, light and vibration alarm functions, the electric buzzer adopts a passive buzzer, and the vibrator adopts a button vibrator; the LCD module comprises a key module and a backlight detection module, the key module realizes multiple functions of different working states, and the backlight detection module is responsible for detecting the light intensity of the environment; the power module adopts a lithium battery and is responsible for continuously supplying power to the alarm module and the LCD module.

2. The aviation kerosene concentration detection method based on the composite sensor as claimed in claim 1, characterized in that: in the step 2 and the step 3, the composite judgment unit also acquires signal data of the sensor detection unit to perform composite judgment, and the hierarchical early warning is realized by using the data transmission of the composite judgment unit and the integrated early warning unit; the signal data includes signal data of the semiconductor sensor module and the infrared sensor module.

3. The aviation kerosene concentration detection method based on the composite sensor as claimed in claim 1, characterized in that: in the step 1, the process of synchronously detecting the kerosene concentration by using the sensor detection unit comprises the following steps:

(1) the detection process of the semiconductor sensor module comprises the following steps: the semiconductor sensor consists of a heater and an MEMS sensor, wherein the heater is modeled as a resistor, the temperature is improved through flowing current and dissipation power, once the heater is provided to a set high-temperature working environment through heating voltage, when the concentration of kerosene steam in the environment changes, the resistance value of the gas sensor generates corresponding oscillation by utilizing the oscillation principle, and the resistance value of the sensor and the concentration of the kerosene steam at the moment are obtained through oscillation frequency;

(2) the infrared sensor module detection process: the gas sensor based on the NDIR infrared absorption principle adopts a light source with obvious C-H bond absorption effect, after the light source passes through an optical cavity body with a certain length for absorption and an optical filter, a dual-channel infrared detector monitors the intensity of infrared light penetrating through the optical filter, and a microprocessor carries out signal acquisition and processing and finally outputs the concentration of kerosene steam.

4. The aviation kerosene concentration detection method based on the composite sensor as claimed in claim 1, characterized in that: in the step 2, the process of determining and outputting the result of the sensor detection unit by using the composite determination unit is as follows:

firstly, signal acquisition is carried out on a sensor detection unit, and then composite judgment and output are carried out on the acquired data through a processing circuit in a composite judgment unit; the signal acquisition comprises a semiconductor sensor module signal and an infrared sensor module signal.

5. The aviation kerosene concentration detection method based on the composite sensor as claimed in claim 1, characterized in that: in the step 3, the data transmission between the composite judgment unit and the integrated early warning unit realizes the following early warning:

the signals output by the composite judgment detection unit are amplified by a sensor signal acquisition and amplification module of the integrated early warning unit and are transmitted to a main control chip for AD conversion; the main control chip converts the AD value into the kerosene steam concentration, then the kerosene steam concentration is displayed by the LCD module in real time, the converted kerosene steam concentration is compared with the threshold value of the first-stage early warning and the threshold value of the second-stage early warning, and the buzzer, the vibrator and the LED alarm lamp are controlled through the I/O port of the main control chip.

6. The aviation kerosene concentration detection method based on the composite sensor as claimed in claim 5, characterized in that: the LCD module realizes real-time display of kerosene vapor concentration, is provided with a buzzer, a vibrator and a plurality of icons of an LED alarm lamp to display the current working state, comprises a key module and a backlight detection module, and realizes multiple functions by scanning the length of time for which a key is pressed and matching with the current working state; the backlight detection module is responsible for detecting the intensity of ambient light and comprises a photosensitive element and a resistor, the photoreceptor converts the light intensity in the environment into an electric signal, the electric signal is amplified by the resistor and then is subjected to AD conversion by a main control chip, the AD conversion is compared with a threshold value to judge the intensity of the ambient light, the backlight lamp is quickly lightened according to the output of the key module or the alarm module when the intensity of the ambient light is lower than the set threshold value, and the backlight lamp is automatically extinguished when the intensity of the ambient light is higher than or equal to the set threshold value; the buzzer adopts a passive buzzer, and gives out high, medium and low sounds to realize graded alarm of different tones; the vibrator adopts a button vibrator; the LED alarm lamp emits red and yellow light.

7. The aviation kerosene concentration detection method based on the composite sensor as claimed in claim 5, characterized in that: the threshold value of the primary early warning and the threshold value of the secondary early warning are set according to the lower explosion limit LEL of the kerosene steam, the threshold value of the primary early warning is set to be 25% LEL, and the threshold value of the primary early warning is set to be 50% LEL; the primary early warning adopts an LED alarm lamp and a buzzer to alarm in a combined manner, the LED alarm lamp flashes in yellow, and the buzzer sends out a middle tone; the secondary early warning adopts LED alarm lamp, bee calling organ, electromagnetic shaker to jointly report to the police, and the red scintillation of LED alarm lamp, bee calling organ send the high pitch, and the vibrator lasts vibrations, stops reporting to the police through the button module.

8. The aviation kerosene concentration detection method based on the composite sensor as claimed in claim 7, characterized in that: the setting of the lower explosion limit is to determine the volume ratio of air to kerosene steam according to a partial pressure distribution method, the kerosene steam is charged into a mixing chamber from low concentration to high concentration, an ignition experiment is carried out, an integrated detection unit and a composite determination unit are taken to detect the average value Li of the maximum unexploded kerosene steam concentration before explosion and the minimum kerosene steam concentration during explosion, i represents the experiment times, the ignition experiment is repeated, each time Li (L1, L2, L3.. Ln) is recorded, after n times of experiments, the value of the lower explosion limit LEL is (L1+ L2+. Ln)/n, and the process of the ignition experiment is as follows:

firstly, adding a certain amount of aviation kerosene into a gas generating device, then heating the exterior of a launching device to make the aviation kerosene in the device generate partial steam, respectively flushing the kerosene steam in the gas generating device into a mixing chamber and a shock tube in a partial pressure distribution mode, then opening a valve to introduce a certain amount of air, starting a circulating pump to circulate to uniformly mix the gas in the mixing chamber and the shock tube, connecting an igniter to the shock tube to ignite and detonate, and simultaneously collecting kerosene concentration data in the mixing chamber; the kerosene concentration data in the mixing chamber is detected by an integrated detection unit and a composite judgment unit.

9. The utility model provides an aviation kerosene concentration detection device based on compound sensor which characterized in that includes: a sensor detection unit and a composite determination unit;

the sensor detection unit includes: the infrared sensor module comprises a semiconductor sensor module and an infrared sensor module; the semiconductor sensor module is formed by developing a micro-nano film on an MEMS (micro-electromechanical system) microplate, and is based on the whole silicon substrate and composed of a heater and a sensor surface sensitive material; the infrared sensor module is a gas sensor based on an NDIR infrared absorption principle and comprises a light source with an obvious C-H bond absorption effect, an optical cavity, a dual-channel detector, a narrow-band optical filter and a microprocessor;

the composite judgment unit realizes signal acquisition and composite judgment of the dual-mode composite sensor; the signal acquisition of the dual-mode composite sensor comprises the following steps: acquiring signals of the semiconductor sensor module and the infrared sensor module;

the integrated early warning unit comprises: the device comprises a sensor signal acquisition and amplification module, a main control chip, an alarm module, an LCD module and a power supply module; the main control chip adopts a microcontroller internally integrated with an A/D converter, a timer, a serial port module and an LCD driver to realize data processing of signals of a processing unit and function control of other modules, wherein the other modules comprise a signal acquisition and amplification module, a composite judgment unit and an alarm module; the alarm module consists of an LED alarm lamp, a buzzer and a vibrator, and has sound, light and vibration alarm functions, the electric buzzer adopts a passive buzzer, and the vibrator adopts a button vibrator; the LCD module comprises a key module and a backlight detection module, the key module realizes multiple functions of different working states, the working states are divided into an alarm state and a non-alarm state, and the backlight detection module is responsible for detecting the light intensity of the environment; the power module adopts a lithium battery and continuously supplies power for each module.

Technical Field

The invention relates to the technical field of aviation kerosene concentration detection, in particular to an aviation kerosene concentration detection method and device based on a composite sensor.

Background

Aviation kerosene is a petroleum product, mainly composed of hydrocarbon compounds of different fractions, has suitable density, high heat value and good combustion performance, is widely applied to the field of aerospace, and can be used as fuel of a piston type direct injection engine or used as substitute fuel in a diesel engine. Meanwhile, the aviation kerosene is a fuel with certain evaporability and extremely high combustion heat value, and once a mixture of steam and air meets open fire or certain induced energy, combustion and explosion accidents are easily caused in the storage and transportation processes of the aviation kerosene, so that the great casualties and property loss are caused, and the research of the kerosene leakage detection technology has very important significance for the development of aviation industry. The aviation kerosene comprises hundreds of components such as paraffin (straight-chain paraffin and branched-chain paraffin), cycloparaffin, aromatic hydrocarbon and the like, the components are complex, if the aviation kerosene is detected through traditional chemical components, a large amount of time and manpower are consumed, the consumable materials matched with instruments are various, the cost of data acquisition is too high, and the requirement of timely responding to the concentration of the aviation kerosene is difficult to achieve; meanwhile, the aviation kerosene has anesthesia and stimulation effects on human bodies, and when the aviation kerosene is inhaled at high concentration, symptoms such as headache, hypodynamia, even coma and the like are presented, so that the detection time is not suitable to be overlong. In order to better prevent accidents caused by leakage of the aviation kerosene in the processes of transportation and storage, a new detection method is needed to replace manual detection, and meanwhile, high timeliness, high safety and high precision of obtaining the concentration data of the leaked aviation kerosene are ensured.

The sensor is a high-precision detection instrument and has important application value in aviation kerosene detection. The first existing scheme is mainly aimed at liquid kerosene leakage in a fuel chamber in the flight of an airplane, is not suitable for other leakage of kerosene in storage and transportation, and has the dielectric constant influenced by temperature. In the second existing scheme, the electric signal output by the thermal conductivity sensor is changed due to the weak change of the concentration of the volatile multi-carbon alkane in the air, and the corresponding kerosene vapor concentration value can be obtained after the weak signal output by the thermal conductivity sensor is amplified and filtered to be subjected to linearization processing by a single chip microcomputer. In the third existing scheme, since the kerosene contains propane, the concentration of propane in the air is collected through a hydrocarbon sensor, and if the collected concentration of propane exceeds a preset threshold value, kerosene leakage around the kerosene is indicated. Based on the analysis of the sensor principle, the characteristics of quick response, high detection sensitivity and interference resistance of a single sensor are difficult to achieve simultaneously. In order to detect the concentration of the leaked aviation kerosene more accurately and quickly, a plurality of sensors are required to be integrated for composite judgment, and accurate metering data can be given out while the sensors respond quickly.

The aviation kerosene transportation mode usually includes railway transportation, road transportation, pipeline transportation and oil tanker transportation, wherein the railway transportation and the road transportation become the transportation modes mainly adopted by numerous domestic small airports due to the characteristics of small investment, flexible transportation, timeliness and the like, the population distribution along the railway and the road is dense, once an oil leakage accident occurs, the aviation kerosene concentration early warning device specially used for the railway kerosene transportation can cause great casualties and property loss to nearby residential areas and traffic crowds along the road, and the aviation kerosene concentration early warning device is needed to prevent major accidents.

Disclosure of Invention

The invention solves the problems: the method and the device for detecting the concentration of the aviation kerosene based on the composite sensor have the advantages of rapid identification and detection and accurate analysis and judgment, and realize real-time monitoring and graded alarm of the aviation kerosene steam.

The technical scheme of the invention is as follows:

a aviation kerosene concentration detection method based on a composite sensor comprises the following steps:

step 1: synchronously detecting the concentration of the kerosene steam by using a sensor detection unit; the sensor detection unit refers to a semiconductor sensor module and an infrared sensor module; the synchronous detection means that two different sensor modules synchronously detect the kerosene steam;

step 2: the composite judgment unit is used for judging and outputting the result of the sensor detection unit, and the composite judgment unit is used for acquiring and compositely judging the sensor signal of the sensor detection unit, so that the kerosene concentration is quickly responded and accurate metering data is given;

and step 3: the integrated early warning unit realizes early warning through data transmission with the composite judgment unit, the integrated early warning unit realizes real-time display of kerosene steam concentration and graded early warning, and the graded early warning refers to different degrees of warning modes set according to explosion limits;

the sensor detection unit includes: the infrared sensor module comprises a semiconductor sensor module and an infrared sensor module; the semiconductor sensor module develops a micro-nano film on an MEMS (micro-electromechanical system) microplate, and is a micro-nano film type gas-sensitive sensor based on an MEMS micro heater, kerosene steam passes through the semiconductor sensor module, the resistance value of the micro-nano film type gas-sensitive sensor generates corresponding oscillation due to the weak change of the concentration of the kerosene steam, and the current concentration of the kerosene steam is detected by obtaining the resistance value of the sensor through oscillation frequency; infrared sensor module is based on the gas sensor of NDIR infrared absorption principle, include the obvious light source to C-H key absorption effect who formulates to kerosene steam, optical cavity, binary channels detector and microprocessor, after absorbing through certain length optical cavity to the light source, by the gas sensor monitoring light source intensity that sees through based on the infrared absorption principle of NDIR, with this concentration that shows kerosene steam, microprocessor carries out signal acquisition, handle and output, simultaneously built-in temperature sensor, can carry out temperature compensation, can further promote the detection precision of sensor.

The composite judgment unit realizes signal acquisition and composite judgment of the dual-mode composite sensor; the signal acquisition of the dual-mode composite sensor comprises the following steps: the system comprises a semiconductor sensor module signal acquisition unit and an infrared sensor module signal acquisition unit.

The integrated early warning unit comprises: the device comprises a main control chip, an alarm module, an LCD module and a power supply module; the main control chip selects an internal integrated A/D converter and an LCD driver of the ultra-low power consumption microcontroller to realize data processing of signals of the processing unit and function control of other modules; the other modules comprise a sensor detection unit and a composite judgment unit; the alarm module consists of an LED alarm lamp, a buzzer and a vibrator, and has sound, light and vibration alarm functions, the electric buzzer adopts a passive buzzer, and the vibrator adopts a small button vibrator; the LCD module comprises a key module and a backlight detection module, the key module realizes multiple functions of different working states, and the backlight detection module is responsible for detecting the light intensity of the environment; the power supply module adopts a lithium battery and is responsible for continuously supplying power to each module, and each module comprises an alarm module, an LCD module and a power supply module.

In the step 2 and the step 3, the composite judgment unit also acquires signal data of the sensor detection unit to perform composite judgment, and the hierarchical early warning is realized by using the data transmission of the composite judgment unit and the integrated early warning unit; the signal data includes signal data of the semiconductor sensor module and the infrared sensor module.

In the step 1, the process of synchronously detecting the kerosene concentration by using the sensor detection unit comprises the following steps:

(1) the detection process of the semiconductor sensor module comprises the following steps: the semiconductor sensor consists of a heater and an MEMS sensor, wherein the heater is modeled as a resistor, the temperature is increased through flowing current and dissipation power, once the heater is provided to a set high-temperature working environment through heating voltage, when the concentration of kerosene steam in the environment changes, the resistance value of the gas sensor generates corresponding oscillation by using an oscillation principle, and the resistance value of the sensor and the concentration of the kerosene steam at the moment are obtained through oscillation frequency.

(2) The infrared sensor module detection process: the gas sensor based on the NDIR infrared absorption principle adopts a light source with obvious C-H bond absorption effect, after the light source passes through an optical cavity body with a certain length for absorption and an optical filter, a dual-channel infrared detector monitors the intensity of infrared light penetrating through the optical filter, and a microprocessor carries out signal acquisition and processing and finally outputs the concentration of kerosene steam.

In the step 2, the process of determining and outputting the result of the sensor detection unit by using the composite determination unit is as follows:

firstly, signal acquisition is carried out on a sensor detection unit, and then composite judgment and output are carried out on the acquired data through a processing circuit in a composite judgment unit. The signal acquisition comprises a semiconductor sensor module signal and an infrared sensor module signal.

In the step 3, the data transmission between the composite judgment unit and the integrated early warning unit realizes the following early warning:

the signals output by the composite judgment detection unit are amplified by a sensor signal acquisition and amplification module of the integrated early warning unit and are transmitted to a main control chip for AD conversion; the main control chip converts the AD value into the kerosene steam concentration, then the kerosene steam concentration is displayed by the LCD module in real time, the converted kerosene steam concentration is compared with the threshold value of the first-stage early warning and the threshold value of the second-stage early warning, and the buzzer, the vibrator and the LED alarm lamp are controlled through the I/O port of the main control chip.

The LCD module realizes real-time display of kerosene vapor concentration, is provided with a buzzer, a vibrator and a plurality of icons of an LED alarm lamp to display the current working state, comprises a key module and a backlight detection module, and realizes multiple functions by scanning the length of time for which a key is pressed and matching with the current working state; the backlight detection module is mainly responsible for detecting the intensity of ambient light and comprises a photosensitive element and a resistor, the light intensity in the environment is converted into an electric signal by the photoreceptor, the electric signal is amplified by the resistor and then is subjected to AD conversion by the main control chip, the intensity of the ambient light is judged by comparing with a threshold value, the backlight lamp is quickly lightened according to the output of the key module or the alarm module under weak light, and the backlight lamp is automatically extinguished under strong light. The buzzer adopts a passive buzzer, can emit high, medium and low sounds and realize the graded alarm of different tones; the vibrator adopts a small button vibrator; the LED alarm lamp can emit red light and yellow light.

The threshold value of the primary early warning and the threshold value of the secondary early warning are set according to the Lower Explosion Limit (LEL) of kerosene steam, the threshold value of the primary early warning is set to be 25% LEL, and the threshold value of the primary early warning is set to be 50% LEL; the primary early warning adopts an LED alarm lamp and a buzzer to alarm in a combined manner, the LED alarm lamp flashes in yellow, and the buzzer sends out a middle tone; the secondary early warning adopts LED alarm lamp, bee calling organ, electromagnetic shaker to jointly report to the police, and the red scintillation of LED alarm lamp, bee calling organ send the high pitch, and the vibrator lasts vibrations, and accessible button module stops reporting to the police.

The method comprises the steps of charging kerosene steam into a mixing chamber from low concentration to high concentration, carrying out an ignition experiment, taking an average value Li of the maximum unexploded kerosene steam concentration before explosion and the minimum kerosene steam concentration when explosion occurs, wherein i represents the experiment times, repeating the ignition experiment and recording Li (L1, L2, L3.. Ln) each time, wherein after n times of experiments, the value of the lower explosion limit LEL is (L1+ L2+. Ln)/n, and the process of the ignition experiment is as follows:

firstly, adding a certain amount of aviation kerosene into a gas generating device, then heating the exterior of a launching device to enable the aviation kerosene in the device to generate partial steam, respectively flushing the kerosene steam in the gas generating device into a mixing chamber and a shock tube in a partial pressure distribution mode, then opening a valve to introduce a certain amount of air, starting a circulating pump to circulate for 20min to enable the gas in the mixing chamber and the shock tube to be uniformly mixed, carrying out an ignition and detonation experiment at a shock tube connecting point igniter, and detecting kerosene concentration data in the mixing chamber through an integrated detection unit and a composite judgment unit.

The invention provides a sensor-based aviation kerosene concentration detection device, which is characterized in that a sensor detection unit and a composite judgment unit are used for carrying out composite judgment, and an integrated early warning unit is combined for transmission, so that quick response is realized, accurate concentration data is given out, and a portable device for real-time monitoring and early warning in an aviation kerosene transportation channel is designed; the channel for aviation kerosene transportation comprises transportation tools such as railways, highways, pipelines, cruise ships and the like.

The sensor detection unit includes: the infrared sensor module comprises a semiconductor sensor module and an infrared sensor module; the semiconductor sensor module is a micro-nano film type gas-sensitive sensor based on an MEMS (micro-electromechanical system) micro heater by developing a micro-nano film on an MEMS micro plate; the infrared sensor module is a gas sensor based on an NDIR infrared absorption principle and comprises a light source with an obvious C-H bond absorption effect, an optical cavity, a dual-channel detector, a narrow-band optical filter and a microprocessor.

The composite judgment unit realizes signal acquisition and composite judgment of the dual-mode composite sensor; the signal acquisition of the dual-mode composite sensor comprises the following steps: the system comprises a semiconductor sensor module signal acquisition unit and an infrared sensor module signal acquisition unit.

The integrated early warning unit comprises: the device comprises a sensor signal acquisition and amplification module, a main control chip, an alarm module, an LCD module and a power supply module; the main control chip selects an internal integrated A/D converter, a timer, a serial port module and an LCD driver of the ultra-low power consumption microcontroller to realize data processing of signals of the processing unit and function control of other modules, wherein the other modules comprise a sensor signal acquisition and amplification module, a composite judgment unit and an alarm module; the alarm module consists of an LED alarm lamp, a buzzer and a vibrator, and has sound, light and vibration alarm functions, the electric buzzer adopts a passive buzzer, and the vibrator adopts a small button vibrator; the LCD module comprises a key module and a backlight detection module, the key module realizes multiple functions of different working states, and the backlight detection module is responsible for detecting the light intensity of the environment; the power module adopts a lithium battery and continuously supplies power for each module.

Compared with the prior art, the invention has the advantages that:

(1) the invention utilizes the sensor detection unit to detect the kerosene steam, and the semiconductor sensor module in the sensor detection unit develops the micro-nano film on the MEMS microplate, so that the sensor has the advantages of high sensitivity and quick response time, is suitable for being integrated and used in a small volume, and simultaneously has higher heating speed and greatly reduced power consumption compared with a traditional sensor based on an MEMS micro heater; the gas sensor module of selecting for use NDIR infrared absorption principle in the sensor detecting element has formulated the customization to the obvious light source of C-H bond absorption effect to kerosene steam, adopts the binary channels to survey simultaneously and realizes space double-optical-path reference compensation, and built-in temperature sensor when getting rid of the detection interference can carry out temperature compensation, further promotes the detection precision of sensor.

(2) The invention utilizes the composite judging unit to judge and output the result of the sensor detecting unit, the sensor detecting unit adopts the working modes of independent work and information composite processing, the semiconductor and the infrared sensor work independently and synchronously, and the signal output by the composite judging unit has high timeliness and high precision.

(3) The invention can realize the graded early warning of the kerosene steam concentration by combining the composite judging unit with the integrated early warning unit, and designs the portable early warning device based on the technology, the device has small volume, light weight, wearing or holding, and high sensitivity, realizes the rapid and accurate real-time monitoring and early warning of the kerosene concentration, and has important application value for detecting the aviation kerosene concentration in road transportation and railway transportation.

Drawings

FIG. 1 is a schematic diagram of the sensor detecting unit of the present invention;

FIG. 2 is a schematic diagram of the operation mode of the composite determination unit according to the present invention;

FIG. 3 is a schematic block diagram of a portable aviation kerosene concentration detector based on a composite sensor according to the present invention;

FIG. 4 is a detection flow chart of the portable aviation kerosene concentration detector based on the composite sensor.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in fig. 1, the sensor detecting unit includes: the infrared sensor module comprises a semiconductor sensor module and an infrared sensor module; the semiconductor sensor module is formed by developing a micro-nano film on an MEMS (micro-electromechanical system) microplate, and is based on the whole silicon substrate and composed of a heater and a sensor surface sensitive material; the infrared gas sensor is used for realizing high-precision metering detection while eliminating detection interference, a gas sensor module of an NDIR infrared absorption principle is selected for the sensor, a light source, an optical cavity and a dual-channel detector which are obvious in C-H bond absorption effect are customized for kerosene steam, spatial dual-light-path reference compensation is realized, a microprocessor carries out signal acquisition, processing and output, a temperature sensor is arranged in the sensor, temperature compensation can be carried out, and the detection precision of the sensor is further improved.

As shown in fig. 2, the process of synchronous detection of kerosene vapor passing through the semiconductor sensor module and the infrared sensor module in the sensor detection unit is as follows:

(1) the detection process of the semiconductor sensor module comprises the following steps: the semiconductor sensor consists of a heater and a sensor surface sensitive material, wherein the heater is modeled as a small resistor, the temperature of the heater is improved by a large amount of current flowing through the heater and necessary power dissipation, once the heater resistor is provided to a certain high-temperature working environment through heating voltage, the resistance value of the sensor is changed by kerosene steam through the adsorption and desorption principle of the sensitive material, when the concentration of the kerosene steam in the environment is changed, the resistance value of the sensor is changed, and the concentration of the kerosene steam at the moment can be detected according to the resistance value.

(2) The infrared sensor module detection process: the light source adopts a light source with obvious C-H bond absorption effect, after the light source is absorbed by an optical cavity with a certain length and passes through an optical filter, the intensity of infrared light passing through the optical filter is monitored by a dual-channel infrared detector, and the microprocessor acquires and processes signals and finally outputs the concentration of kerosene steam.

The composite judgment unit firstly acquires signals from the sensor detection unit and then compositely judges and outputs the acquired data through a processing circuit in the composite judgment unit. The signal acquisition includes semiconductor sensor module signal and infrared sensor module signal, and wherein the semiconductor sensor module has the corresponding time short, the high advantage point of sensitivity, and the infrared sensor module has the advantage that detection accuracy is high, the interference killing feature is strong, and the output after compound judgement possesses the advantage of its two kinds of sensor modules simultaneously.

As shown in figure 3, the portable aviation kerosene concentration detector based on the composite sensor comprises a sensor detection unit, a composite judgment unit and an integrated early warning unit. Wherein integration early warning unit includes: the device comprises a main control chip, an alarm module, an LCD module and a power supply module; the main control chip selects an internal integrated A/D converter, a timer, a serial port module and an LCD driver of the ultra-low power consumption microcontroller to realize data processing of signals of the processing unit and function control of other modules, wherein the other modules comprise a sensor signal acquisition and amplification module, a composite judgment unit and an alarm module; the alarm module consists of an LED alarm lamp, a buzzer and a vibrator, and has triple alarms of sound, light and vibration, the electric buzzer adopts a passive buzzer, and the vibrator adopts a small button vibrator; the LCD realizes real-time display of kerosene vapor concentration, and is provided with a buzzer, a vibrator and a plurality of icons of an LED alarm lamp for displaying the current working state, the LCD comprises a key module and a backlight detection module, and the key module realizes multiple functions by scanning the length of time for which a key is pressed and matching with the current working state; the backlight detection module is mainly responsible for detecting the intensity of ambient light and consists of a photosensitive element and a resistor; the power supply module adopts a lithium battery and is responsible for continuously supplying power to each module, and each module comprises an alarm module, an LCD module and a power supply module.

As shown in fig. 4, the detection process of the portable aviation kerosene concentration detector based on the composite sensor of the present invention includes:

and (5) initializing the system. The system initialization refers to initialization of preset parameters, including initialization of an early warning threshold and initialization of a backlight brightness threshold. The early warning threshold is set by the Lower Explosion Limit (LEL) of kerosene steam, the threshold of the primary early warning is set to 25% LEL, and the threshold of the primary early warning is set to 50% LEL. The backlight brightness threshold is set by human.

And (6) self-checking the equipment. The equipment self-checking is to judge whether the sensor detection unit works normally.

And (5) performing composite detection by the sensor. The sensor composite detection means that the kerosene steam respectively passes through the infrared sensor and the semiconductor sensor, and the two sensors simultaneously detect the concentration of the kerosene steam.

And (5) performing composite judgment display. And a processing circuit in the composite judgment unit carries out composite judgment on signals of the infrared sensor and the semiconductor sensor module, and the concentration value of the kerosene steam subjected to composite judgment is acquired and displayed on an LCD screen in real time.

And (6) judging a threshold value. Comparing the composite judgment result with an initial early warning threshold, and if the composite judgment result is greater than or equal to 50% LEL, performing secondary warning, wherein the secondary warning adopts an LED warning lamp, a buzzer and a vibrator to perform combined warning, the LED warning lamp flashes in red, the buzzer emits high tones, the vibrator vibrates continuously, and the warning can be stopped through a key module; if the result of compound judgement is less than 50% LEL and simultaneously more than or equal to 25% LEL, then carry out the primary alarm, the LED alarm lamp buzzer combination is reported to the police to the primary alarm, and LED alarm lamp yellow lamp scintillation, the buzzer sends the mediant, and accessible button module stops reporting to the police.