阅读说明：本技术 一种基于时域oct测距的非接触式电子体温计 (Non-contact electronic thermometer based on time domain OCT ranging ) 是由 秦嘉 安林 高儒将 于 2020-05-25 设计创作，主要内容包括：本发明公开了一种基于时域OCT测距的非接触式电子体温计,提出的一种基于时域OCT测距的非接触式电子体温计,使体温测量时设备处于一个合适位置和距离,以提高非接触式电子测温设备的测温精度；包括壳体和设置于壳体内的电源、温度传感器、OCT测距模块、集成电路模块、显示屏、蜂鸣器、指示与报警模块；所述电源与所述集成电路模块连接,所述集成电路模块包括控制芯片、温度信号转换单元、距离信号转换单元、显示驱动单元、音频处理单元。在整个体温测量系统中加入基于时域OCT技术的测距功能,所得的距离参数能够提醒使用者将设备放于一个合适位置对被测者进行温度测量,距离参数也可用于对设备进行校正以获得更高的读数精度。(The invention discloses a non-contact electronic thermometer based on time domain OCT (optical coherence tomography) ranging, which is provided to enable equipment to be in a proper position and distance during body temperature measurement so as to improve the temperature measurement precision of non-contact electronic temperature measurement equipment; the OCT ranging system comprises a shell, and a power supply, a temperature sensor, an OCT ranging module, an integrated circuit module, a display screen, a buzzer and an indication and alarm module which are arranged in the shell; the power supply is connected with the integrated circuit module, and the integrated circuit module comprises a control chip, a temperature signal conversion unit, a distance signal conversion unit, a display driving unit and an audio processing unit. The distance measurement function based on the time domain OCT technology is added into the whole body temperature measurement system, the obtained distance parameter can remind a user to place the equipment at a proper position to measure the temperature of a measured person, and the distance parameter can also be used for correcting the equipment to obtain higher reading precision.)

1. A non-contact electronic thermometer based on time domain OCT ranging is characterized by comprising a shell, and a power supply, a temperature sensor, an OCT ranging module, an integrated circuit module, a display screen, a buzzer and an indication and alarm module which are arranged in the shell;

the power supply is coupled to the integrated circuit module,

the integrated circuit module comprises a control chip, a temperature signal conversion unit, a distance signal conversion unit, a display driving unit and an audio processing unit,

the indicating and alarming module, the temperature signal conversion unit, the distance signal conversion unit, the display driving unit and the audio processing unit are respectively connected with the control chip, the temperature signal conversion unit is connected with the temperature sensor, the distance signal conversion unit is connected with the OCT ranging module, the display driving unit is connected with the display screen, and the audio processing unit is connected with the buzzer.

2. The time-domain OCT ranging-based non-contact electronic thermometer of claim 1, wherein the OCT ranging module comprises a light source, a sample arm, a reference arm, a fiber coupler and a photoelectric sensor, one end of the fiber coupler is connected with the reference arm and the sample arm respectively, and the other end of the fiber coupler is connected with the light source and the photoelectric sensor respectively; the distance signal conversion unit is connected with the photoelectric sensor.

3. The time-domain OCT ranging-based non-contact electronic thermometer of claim 1, wherein: the temperature signal conversion unit comprises a first preceding stage signal processing unit and a first A/D device, and the temperature sensor is connected with the first A/D device through the first preceding stage signal processing unit.

4. The time-domain OCT ranging-based non-contact electronic thermometer of claim 1, wherein: the distance signal conversion unit comprises a second preceding stage signal processing unit and a second A/D device, and the photoelectric sensor is connected with the second A/D device through the second preceding stage signal processing unit.

5. The time-domain OCT ranging-based non-contact electronic thermometer of claim 1, wherein the power supply is a 3.3v or 5v power supply.

6. The time-domain OCT ranging-based non-contact electronic thermometer according to any of claims 1-5, wherein the integrated circuit module further has a memory unit, and the memory unit is connected to the control chip.

7. The time-domain OCT ranging-based non-contact electronic thermometer of claim 6, wherein the integrated circuit module further comprises a key unit, and the key unit is connected to the control chip and connected to a key arranged on the housing.

8. The time-domain OCT ranging-based non-contact electronic thermometer of claim 7, wherein the integrated circuit module further has a reset unit, and the reset unit is connected to the control chip.

Technical Field

The invention relates to the technical field of temperature detection, in particular to a non-contact electronic thermometer based on time domain OCT ranging.

Background

Thermometers, also known as medical thermometers, are used to measure body temperature and provide information about the body temperature to a doctor. The contact glass mercury thermometer is the most common thermometer, can measure the body temperature of different positions of a human body and judge whether the human body generates heat or not according to the temperature values of different positions of the normal human body, and is characterized in that mercury cannot return into a mercury bubble after the thermometer leaves the human body, and the thermometer can keep the body temperature reading, so the thermometer is the most accurate thermometer, but the reading has errors and is fragile in material.

Electronic thermometers have been developed which convert temperature parameters into physical parameters of other media, such as resistance, voltage, current, etc., which have a certain relationship with temperature, and which are detected and processed to obtain physical parameters that are digitally displayed for reference. The electronic thermometer has the advantages that the temperature can be measured in a non-contact mode, clear temperature reading can be obtained, and compared with a mercury thermometer, the electronic thermometer is more visual and convenient to carry. The electronic thermometers also comprise ear thermometers and forehead thermometers, wherein the ear thermometers are used for measuring the radiation temperature of eardrum membranes, a probe needs to be aligned with an inner ear canal, and the electronic thermometers are obviously inconvenient or uncomfortable in practical use; the forehead temperature thermometer is a novel thermometer and has the advantages of high accuracy and convenience in reading and carrying.

Besides the thermometer, the thermometer is also provided with a sticker thermometer, and the thermometer can be repeatedly used, has small volume and low precision, and is convenient to carry; a nipple thermometer, which is mainly used for testing the body temperature of the baby who sucks the milk; the ear thermometer is expensive and not suitable for common families, the disposable thermometer is slightly larger in appearance and can correctly measure the oral temperature, and the disposable thermometer can avoid cross infection of diseases among patients, but is relatively high in cost.

However, the existing thermometers, such as contact thermometers including mercury thermometers, generally take 6 to 10 minutes in actual operation, take relatively much time, and are not suitable for emergency situations; the accuracy of the sticker thermometer is low, and misjudgment is easy to occur; the non-contact thermometer and the ear thermometer can give uncomfortable feeling in actual use; although the readings of electronic thermometers such as an infrared thermometer and a forehead thermometer are clear, the distance measured at each time cannot be guaranteed to be consistent, the practical use only can provide a rough range suitable for measurement, and the electronic element has errors, so that the readings have certain errors, and the measurement precision is not easy to guarantee.

The OCT (optical coherence tomography) technology is an imaging technology utilizing interference of weak coherent light, detects back scattering or several scattering signals of the weak coherent light at different depth layers of a biological tissue, and obtains a structural image of the biological tissue through scanning. The OCT technology is initially used for biomedical tomography, and is being advanced to other fields, composite nondestructive testing, thickness measurement, high-density data storage, and the like, with the development of the OCT technology.

Therefore, in order to solve the problems that the measuring distances of the existing non-contact type clinical thermometers are difficult to unify and the measuring precision cannot be effectively guaranteed, the invention aims to provide the non-contact type electronic clinical thermometer combining OCT (optical coherence tomography) distance measurement.

Disclosure of Invention

The invention aims to provide a non-contact electronic thermometer based on time domain OCT ranging, which solves one or more technical problems in the prior art and provides at least one beneficial choice or creation condition.

According to the non-contact electronic thermometer based on time domain OCT ranging provided by the technical scheme of the invention, the equipment is in a proper position and distance during body temperature measurement, so that the temperature measurement precision of the non-contact electronic temperature measurement equipment is improved.

Specifically, a non-contact electronic thermometer based on time domain OCT ranging includes the following steps:

a non-contact electronic thermometer based on time domain OCT ranging comprises a shell, and a power supply, a temperature sensor, an OCT ranging module, an integrated circuit module, a display screen, a buzzer and an indication and alarm module which are arranged in the shell; the power supply is connected with the integrated circuit module, the integrated circuit module comprises a control chip, a temperature signal conversion unit, a distance signal conversion unit, a display driving unit and an audio processing unit, the indication and alarm module, the temperature signal conversion unit, the distance signal conversion unit, the display driving unit and the audio processing unit are respectively connected with the control chip, the temperature signal conversion unit is connected with the temperature sensor, the distance signal conversion unit is connected with the OCT ranging module, the display driving unit is connected with the display screen, and the audio processing unit is connected with the buzzer.

One of the functions of the reference arm is to compensate the optical path length so that a certain optical path length difference is generated between the sample arm and the reference arm to obtain a more pronounced interference pattern, and the other purpose of the reference arm is to adjust the optical power.

By using the OCT ranging module, under the condition that the optical path compensated by the reference arm is fixed, the distance between the equipment and the position to be measured of the human body can be obtained by utilizing the interference position of the two beams of light; the distance parameter is used for prompting the measurement distance between the equipment and a human body, and if the distance parameter is too large, the buzzer gives an alarm to prompt a user whether the distance measurement is too large in real time, so that the distance measurement can be flexibly adjusted to ensure the temperature measurement within a set distance range, the inaccurate temperature measurement caused by the too large distance measurement is avoided, and the accurate and reliable temperature measurement is ensured; meanwhile, the temperature compensation device can be used for equipment correction, and can compensate the temperature through the distance to obtain a human body temperature value with higher precision.

Furthermore, the OCT ranging module comprises a light source, a sample arm, a reference arm, an optical fiber coupler and a photoelectric sensor, wherein one end of the light coupler is connected with the reference arm and the sample arm respectively, the other end of the light coupler is connected with the light source and the photoelectric sensor respectively, namely one end of the light coupler is connected with the reference arm and the sample arm, and the other end of the light coupler is connected with the light source and the photoelectric sensor. A camera (detector) part in the OCT system is replaced by a photoelectric sensor, an optical signal is obtained by the photoelectric sensor, and the obtained digital signal is converted after being processed by a basic circuit module; the distance signal conversion unit is connected with the photoelectric sensor.

Further, the temperature signal conversion unit comprises a first preceding stage signal processing unit and a first A/D device, and the temperature sensor is connected with the first A/D device through the first preceding stage signal processing unit.

Furthermore, the distance signal conversion unit comprises a second preceding stage signal processing unit and a second a/D device, and the photoelectric sensor (or called as a photoelectric sensor) is connected with the second a/D device through the second preceding stage signal processing unit. Further, the power supply is a 3.3v or 5v power supply.

As a further improvement of the above solution, the integrated circuit module further has a memory cell (NOR/NAND/DRAM/SRAM memory chip) connected to the control chip; in order to facilitate storing of the measurement results.

Furthermore, the integrated circuit module is also provided with a key unit, and the key unit is connected to the control chip and connected with a key arranged on the shell, so that the function selection operations such as start-stop operation, display adjustment and the like of the equipment are facilitated.

Furthermore, the integrated circuit module is also provided with a reset unit which is connected with the control chip; so as to reset when the equipment is halted, thereby improving the stability of the system.

The invention has the beneficial effects that: the distance measurement function based on the time domain OCT technology is added into the whole body temperature measurement system, the obtained distance parameter can remind a user to place the equipment at a proper position to measure the temperature of a measured person, and the distance parameter can also be used for correcting the equipment to obtain higher reading precision.

Drawings

The above and other features of the present invention will become more apparent by describing in detail embodiments thereof with reference to the attached drawings in which like reference numerals designate the same or similar elements, it being apparent that the drawings in the following description are merely exemplary of the present invention and other drawings can be obtained by those skilled in the art without inventive effort, wherein:

FIG. 1 is a schematic diagram of a time-domain OCT configuration;

fig. 2 is an overall signal flow diagram of an electronic thermometer for time-domain OCT ranging.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

The invention provides a non-contact electronic thermometer based on time domain OCT ranging, which has the working principle that:

a schematic diagram of a time domain OCT structure of a non-contact electronic thermometer based on time domain OCT ranging is shown in figure 1, the working principle is that a light source SLED emits light with required wavelength, the light enters an optical fiber coupler CP through an optical fiber, a light beam is divided into two beams of light, one beam of light enters a reference system (reference arm) through the optical fiber and a collimator, the other beam of light irradiates the surface of a sample to be measured (sample arm), the reflected or backscattered light of the two beams of light is integrated into one beam of light at the optical fiber coupler again and detected by a detector, and the detector converts an optical signal into an electric signal and then executes a digital signal processing algorithm at a PC end to obtain sample depth scanning. The core of the OCT technology for realizing the distance measurement is that two beams of light generate interference when the optical paths of the reference arm and the sample arm are equal. The distance measurement principle is as follows: under the condition that the optical path of the reference arm is fixed, the distance between the sample arm and the photoelectric sensor can be obtained by utilizing the interference position of the two beams of light, and the distance between the device and the position to be measured of the human body can be obtained at the same time; the distance parameter can be used for prompting the distance between the equipment and the human body, also can be used for equipment correction, and can be used for compensating the temperature through the distance to obtain a human body temperature value with higher precision;

in the scheme, the adopted circuit module comprises an MCU minimum system, a key, a temperature sensor, a photoelectric sensor, an A/D conversion device, an audio processing circuit, an external storage unit (storage unit), an LCD display module, a buzzer, an indication and alarm module and a power supply; MCU mainly handles the signal that photoelectric sensor and temperature sensor obtained in proper order, and whole equipment can be first range finding, the later temperature measurement. When the time-domain OCT ranging principle is used, a photoelectric sensor is adopted to replace a camera (detector) part in an OCT system, an optical signal is obtained by the photoelectric sensor, a digital signal obtained by converting the optical signal through the photoelectric sensor and an A/D device II (A/D2) is processed by an MCU of the whole electronic thermometer system, and the whole signal flow diagram of the electronic thermometer for time-domain OCT ranging is shown in FIG. 2;

setting distance parameters of the equipment from a position to be measured in an MCU (microprogrammed control unit), when a thermometer is close to the position (forehead, armpit and the like) to be measured of a human body, a time domain OCT (optical coherence tomography) system firstly carries out distance measurement, interference fringes can be obtained when two beams of light interfere, a sinusoidal voltage signal can be obtained after the sinusoidal voltage signal passes through a photoelectric sensor, the signal is preprocessed by a second preceding stage signal processing unit (a second preceding stage signal processing circuit 2), then transmitted to a second A/D (A/D2, A/D chip) device, and converted into a digital signal through the second A/D device (A/D2) device to be stored in a storage unit; processing the data through an MCU internal program or algorithm, and when the data accord with a sinusoidal signal, indicating that the equipment is proper to the position to be measured of the human body, and the buzzer can give out a prompt tone;

after the distance measurement is completed, the equipment can carry out temperature test by itself at the moment. After the temperature sensor obtains the temperature signal, the first preceding stage signal processing unit (the first preceding stage signal processing circuit 1) preprocesses the voltage signal, transmits the voltage signal to the first A/D device (A/D1, A/D chip), and processes the digital signal by the MCU. After the temperature test is finished, the buzzer can also send out a prompt tone, and meanwhile, the temperature value can be displayed in the LCD display module;

the first preceding-stage signal processing unit and the second preceding-stage signal processing unit are both preceding-stage processing circuits (preprocessing circuits), which are circuits that perform a series of preprocessing on the voltage signal before analog-to-digital conversion, such as temperature, readout, amplification, noise cancellation, and the like of the photoelectric signal. The preceding processing circuit not only affects the dynamic range of the temperature sensor and the photoelectric sensor system, but also greatly affects the expansion of the system function, and the circuit of each module in the preceding processing circuit at least comprises a gain amplifier.

The alarm processing part contained in the MCU program comprises: 1. the distance error alarm is carried out, and when the distance cannot be in a proper range for a long time, the system can send out buzzing sound and flashing indication; 2. when the human body is in different body temperature states such as normal and fever, the device can prompt the user of the human body temperature state in different modes, for example, a buzzer makes different sounds and an indicator lamp can be represented by different flashing speeds;

the system also comprises a dead halt reset circuit for improving the stability of the system; the key circuit performs function selection operations such as start-stop operation, display adjustment and the like on the equipment.

Although the present invention has been described in considerable detail and with reference to certain illustrated embodiments, it is not intended to be limited to any such details or embodiments or any particular embodiment, so as to effectively encompass the intended scope of the invention. Furthermore, the foregoing describes the invention in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial modifications of the invention, not presently foreseen, may nonetheless represent equivalent modifications thereto.