CN111982851A - Alcohol gas detection device and detection method - Google Patents

Abstract

The invention provides an alcohol gas detection device and a detection method, comprising a gas collection component, a gas detection component and a data processing component fixed in sequence; the gas collection component is used to collect the gas exhaled by a person under test; the gas detection component includes a light source emission unit and light detectors; the light source emission unit is used to provide modulated light of a specific spectrum, and is used to emit the modulated light of a specific spectrum to the gas collection component; the light detector is used to detect the modulated light of a specific spectrum after absorbing alcohol gas. Modulate light intensity; the data processing component is used to judge whether the breath exhaled by the tested person contains alcohol gas, or detect the gas exhaled by the tested person according to the change of the light intensity of the modulated light of a specific spectrum before and after absorbing alcohol gas alcohol gas concentration. The invention can effectively improve the response speed of alcohol gas detection, prolong the life of the alcohol gas detection device, and can also effectively improve the accuracy of the alcohol gas detection result.

Description

Alcohol gas detection device and detection method

technical field

The invention relates to the technical field of optical detection, in particular to an alcohol gas detection device and a detection method.

Background technique

In order to prevent the harm caused by drunk driving, breath alcohol detectors are usually equipped in key places such as bus companies, long-distance stations, and airports. Most of the existing breath alcohol detectors are based on the electrochemical principle for alcohol detection, and use the built-in electrochemical alcohol sensor to detect the alcohol gas content in the breath exhaled by people. However, electrochemical alcohol sensors have problems such as slow response and short lifespan, which lead to the need for regular calibration or replacement of electrochemical alcohol sensors. In addition, the electrochemical alcohol sensor needs to be in contact with alcohol gas to achieve detection. If the electrochemical alcohol sensor is not in sufficient contact with alcohol gas, the alcohol detection result may be inaccurate.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide an alcohol gas detection device and a detection method, which can effectively improve the response speed of alcohol detection, prolong the life of the alcohol gas detection device, and effectively improve the accuracy of alcohol gas detection results.

In a first aspect, an embodiment of the present invention provides an alcohol gas detection device, including a gas collection component, a gas detection component, and a data processing component fixed in sequence; wherein, the gas collection component is used to collect the gas exhaled by the tested person; The gas detection assembly includes a light source emission unit and a light detector; the light source emission unit is used to provide modulated light of a specific spectral band, and to emit the modulated light of the specific spectral band to the gas collection assembly, So that the modulated light of the specific spectral band absorbs the gas exhaled by the tested person after absorbing the water vapor collected in the gas collection component; the light detector is used to detect the modulated light of the specific spectral band after absorbing alcohol gas The light intensity is sent to the data processing component; the data processing component is used to receive the modulated light intensity of a specific spectral band after absorbing alcohol gas, and according to the modulated light intensity of the specific spectral band before and after absorbing alcohol gas Change, determine whether the breath exhaled by the tested person contains alcohol gas, or detect the alcohol gas concentration in the breath exhaled by the tested person.

In one embodiment, the gas collection assembly includes a water filter membrane, an air guide hood and a gas pool that are fixed in sequence; wherein, the water filter membrane is used to absorb water vapor contained in the breath exhaled by the tested person ; The air guide hood adopts a closed-mouth structure, which is used to guide the gas exhaled by the tested person to move to the gas pool; the gas pool is used to collect the gas exhaled by the tested person.

In one embodiment, the light source emitting unit includes an infrared light source, an optical chopper and a reflective element; wherein, the infrared light source is used to emit infrared light of a specific spectral band; the optical chopper is used to obtain the infrared light of a specific spectral band modulated light; the reflective element is used for reflecting the modulated light of the specific spectral band to the gas cell, and emitting the modulated light of the specific spectral band passing through the gas cell to the photodetector.

In one embodiment, the reflective element includes a plurality of flat mirrors and a plurality of concave mirrors; each of the flat mirrors and each of the concave mirrors is coated with a reflective film; the gas collection assembly further includes The movable end caps fixed on both sides of the gas pool, each of the movable end caps is fixed with the plane reflection mirror or the concave reflection mirror.

In one embodiment, the device further includes a fingerprint collection component, and the fingerprint collection component includes a fingerprint collection instrument and a fingerprint information storage unit; wherein, the fingerprint collection instrument is used to collect the fingerprint of the tested person; the The fingerprint information storage unit is used to store the fingerprint information of the tested person.

In an embodiment, the device further includes a body temperature detection component, the body temperature detection component includes an optical element, an infrared sensor and a signal processing unit; wherein, the optical element is used for converging the infrared rays radiated by the person under test; The infrared sensor is used for converting the infrared light into an electrical signal, and sending the electrical signal to the signal processing unit; the signal processing unit is used for receiving the electrical signal and converting it to obtain the body temperature of the tested person .

In one embodiment, the signal processing unit includes a signal amplifier, a signal collector and a signal processor; wherein the signal amplifier is used for amplifying the electrical signal; the signal collector is used for amplifying the amplified signal The processed electrical signal is subjected to analog-to-digital conversion processing to obtain a digital signal corresponding to the electrical signal; the signal processor is configured to convert the digital signal to obtain the body temperature of the tested person.

In one embodiment, the device further includes a human-computer interaction component, and the human-computer interaction component includes a touch display screen and a voice broadcasting unit; wherein, the touch display screen is used to display the gas exhaled by the tested person Whether it contains alcohol gas and the body temperature of the tested person; the voice broadcasting unit is used to prompt the tested person to perform fingerprint detection.

In a second aspect, an embodiment of the present invention further provides an alcohol gas detection method, the method is applied to the alcohol gas detection device according to any one of the first aspect, and the method includes: using a gas collection component to collect the Measure the gas exhaled by the person; use the light source emitting unit in the gas detection component to provide modulated light of a specific spectrum, and emit the modulated light of the specific spectrum to the gas collection component, so that the specific spectrum is The modulated light absorbs the gas exhaled by the tested person after absorbing water vapor collected in the gas collection component, and uses the light detector to detect the modulated light intensity of a specific spectrum after absorbing alcohol gas; according to the specific spectrum The light intensity change of the modulated light of the segment before and after absorbing alcohol gas can be used to determine whether the breath exhaled by the tested person contains alcohol gas, or to detect the alcohol gas concentration in the breath exhaled by the tested person.

In one embodiment, the step of obtaining whether the breath exhaled by the tested person contains alcohol gas according to the modulated light intensity of the specific spectral band after absorbing the alcohol gas includes:

In the case that there is no alcohol gas in the gas collection component, the light intensity of the modulated light of the specific spectral band before absorbing alcohol gas is detected by the light detector;

In the case that the alcohol gas is collected in the gas collection component, the optical detector is used to detect the light intensity of the modulated light of the specific spectral band after absorbing the alcohol gas;

According to the change of the light intensity of the modulated light of a specific spectrum before and after absorbing alcohol gas, it is judged whether the breath exhaled by the tested person contains alcohol gas, or the concentration of alcohol gas in the breath exhaled by the tested person is detected.

An alcohol gas detection device and a detection method provided by the embodiments of the present invention include a gas collection component, a gas detection component and a data processing component which are fixed in sequence; wherein, the gas collection component is used to collect the gas exhaled by a person under test; the gas detection component It includes a light source emitting unit and a light detector; the light source emitting unit is used to provide modulated light of a specific spectral band, and to emit the modulated light of a specific spectral band to a gas collection component, so that the modulated light of a specific spectral band can absorb the gas The gas exhaled by the tested person after absorbing the water vapor collected in the collection component; the photodetector is used to detect the modulated light intensity of a specific spectral band after absorbing alcohol gas, and send it to the data processing component; the data processing component is used to receive the absorption The modulated light intensity of a specific spectrum after alcohol gas, according to the change of the light intensity of the modulated light of a specific spectrum before and after absorbing the alcohol gas, to determine whether the breath exhaled by the tested person contains alcohol gas, or to detect whether the tested person is exhaled. The concentration of alcohol gas in the breath exhaled by a person. The above-mentioned device adopts the principle of optical detection to detect the gas exhaled by the tested person, and has a relatively fast response speed, and because the optical related components have a long life, the embodiments of the present invention can effectively alleviate the problem that the device needs to periodically calibrate or update the optical related components. . In addition, when the alcohol gas detection device provided by the embodiment of the present invention performs detection, the detection can be realized without contacting the alcohol gas with the optical element. Therefore, the alcohol gas detection result of the above-mentioned device provided by the embodiment of the present invention is not affected by the alcohol gas and the optical correlation. The contact degree of the components is affected, and the alcohol gas detection results have high accuracy.

Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the description, claims and drawings.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

1 is a schematic structural diagram of an alcohol gas detection device according to an embodiment of the present invention;

2 is a schematic structural diagram of another alcohol gas detection device provided by an embodiment of the present invention;

3 is a schematic structural diagram of a gas cell provided in an embodiment of the present invention;

4 is a schematic structural diagram of a reflective element provided by an embodiment of the present invention;

FIG. 5 is a schematic flowchart of an alcohol gas detection method according to an embodiment of the present invention.

Icons: 1-Gas collection component; 2-Gas detection component; 3-Data processing component; 1.1-Water filter membrane; 1.2-Gas guide hood; 1.3-Gas pool; - Light detector; 2.3 - Detector driver; 2.1.1 - Infrared light source; 2.1.2 - Optical chopper; 2.1.3 - Reflective element; 2.1.4 - Light source driver; Collector; 4.2-fingerprint information storage unit; 5-body temperature detection component; 5.1-optical element; 5.2-infrared sensor; 5.3-signal processing unit; 6-human-computer interaction component; 6.1-touch display screen; 6.2-voice broadcasting unit ; 2.1.3.1 - first plane mirror; 2.1.3.2 - second plane mirror; 2.1.3.3 - first concave mirror; 2.1.3.4 - second concave mirror; 2.1.3.5 - third concave mirror ; 2.1.3.6 - Third Plane Mirror.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely below with reference to the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

At present, the existing breath alcohol detectors have problems such as slow response, short lifespan, and inaccurate test results. Moreover, the breath alcohol detectors need to be in contact with the human mouth by means of mouthpieces and other accessories to perform alcohol gas detection. , it is more inconvenient to use. In view of this, the implementation of the present invention provides an alcohol gas detection device and detection method, which does not require accessories such as mouthpieces, and can achieve alcohol gas detection through a non-contact method, that is, a person exhales at a certain distance from the device, and can effectively improve alcohol gas detection. The detection response speed can prolong the life of the alcohol gas detection device, and can also effectively improve the accuracy of the alcohol gas detection result.

In order to facilitate the understanding of this embodiment, an alcohol gas detection device disclosed in the embodiment of the present invention is first introduced in detail. Referring to the schematic structural diagram of an alcohol gas detection device shown in FIG. 1 , the device includes sequentially fixed gas collection devices. Component 1, gas detection component 2 and data processing component 3.

In one embodiment, the above-mentioned gas collection assembly 1 is used to collect the gas exhaled by the tested person. Among them, in practical applications, the person to be tested faces the alcohol gas detection device and exhales at a certain distance, and the exhaled gas is collected into the gas collection component.

In one embodiment, the gas detection assembly 2 includes a light source emitting unit 2.1 and a light detector 2.2. Wherein, the light source emission unit 2.1 is used to provide modulated light of a specific spectral band, and to emit the modulated light of a specific spectral band to the gas collection component, so that the modulated light of the specific spectral band absorbs the light collected in the gas collection component. For the breath exhaled by the tested person after inhaling the water vapor, in one embodiment, the light source emitting unit may be provided with a light source for providing a specific spectral band, and modulated light of a specific spectral band can be obtained by modulating the light. In addition, The light source emitting unit may also be provided with a reflective element, so as to emit modulated light of a specific spectral band to the gas collection assembly. The light detector 2.2 is used to detect the modulated light intensity of a specific spectral band after absorbing alcohol, and send it to the data processing component. In practical applications, because alcohol gas has an absorption effect on a specific spectrum, especially strong absorption at 3300 nm to 3500 nm, and basically no absorption near 3900 nm, based on this characteristic, the embodiment of the present invention adjusts the adjustable spectrum of a specific spectrum. The light is sent to the gas collection component, and the tunable light of the specific spectrum is used to absorb the alcohol gas collected in the gas collection component, so as to judge the exhalation of the tested person based on the change of the light intensity of the modulated light of the specific spectrum before and after absorbing the alcohol gas. Whether the gas contains alcohol gas, or detect the alcohol gas concentration in the breath exhaled by the tested person.

The data processing component 3 is used to receive the modulated light intensity of a specific spectral band after absorbing alcohol, and obtain the detection result according to the change of the light intensity of the modulated light of the specific spectral band before and after absorbing alcohol gas. The detection result may include whether the breath exhaled by the tested person contains alcohol gas, and may also include the alcohol concentration in the breath exhaled by the tested person.

The above-mentioned alcohol gas detection device provided by the embodiment of the present invention uses the optical detection principle to detect the gas exhaled by the tested person, and has a relatively fast response speed, and because the optical correlation element has a long life, the embodiment of the present invention can effectively alleviate the The problem of the device requiring periodic calibration or updating of optically related components. In addition, the alcohol gas detection device provided by the embodiment of the present invention does not need to contact the alcohol gas with the optical element during detection, and the detection can be realized in a non-contact manner. Therefore, the alcohol gas detection result of the above-mentioned device provided by the embodiment of the present invention is inconsistent. It is affected by the contact degree of alcohol gas and optical related components, and the detection result of alcohol gas has high accuracy.

In order to facilitate the understanding of the alcohol gas detection device provided by the above-mentioned embodiments, the embodiment of the present invention provides another alcohol gas detection device. Refer to the structural schematic diagram of another alcohol gas detection device shown in FIG. 2 , which is shown in FIG. 2 . It can be seen that the above-mentioned gas collection assembly 1 includes a water filter membrane 1.1, an air guide hood 1.2 and a gas pool 1.3 fixed in sequence; the light source emission unit 2.1 includes an infrared light source 2.1.1, an optical chopper 2.1.2 and a reflection element 2.1.3, The light source emission unit 2.1 further includes a light source driver 2.1.4 connected with the infrared light source 2.1.1; the gas detection component 2 further includes a detector driver 2.3 connected with the light detector 2.2; the above-mentioned alcohol gas detection device also includes a fingerprint collection component 4, The fingerprint collecting component 4 includes a fingerprint collecting instrument 4.1 and a fingerprint information storage unit 4.2; the above-mentioned alcohol gas detection device further includes a body temperature detecting component 5, and the body temperature detecting component 5 includes an optical element 5.1, an infrared sensor 5.2 and a signal processing unit 5.3; the above-mentioned alcohol gas detection The device further includes a human-computer interaction component 6, and the human-computer interaction component 6 includes a touch display screen 6.1 and a voice broadcasting unit 6.2.

Based on the alcohol gas detection device shown in FIG. 2 , the embodiments of the present invention further explain the functions of each component in the alcohol gas detection device.

In one embodiment, the above-mentioned water filtering membrane 1.1 is used to absorb and remove the water vapor contained in the breath exhaled by the tested person. In practical applications, the water filter membrane can be disassembled and replaced, which can be used to absorb the water vapor contained in the gas exhaled by the tested person without blocking the gas exhaled by the tested person.

In one embodiment, the above-mentioned air guide hood 1.2 is used to guide the gas exhaled by the tested person to the gas pool. Optionally, the air guide hood can be a constricted structure with a wide top and a narrow bottom. Using the air guide hood of this structure, the gas exhaled by the tested person can be guided into the gas pool in a converged state. Since the embodiments of the present invention provide The air guide hood has a good gas gathering effect, so it can improve the accuracy of alcohol gas detection results to a certain extent.

In one embodiment, the above-mentioned gas cell 1.3 is used to collect the gas exhaled by the tested person. Optionally, the gas pool can be a semi-closed rectangular box. In order to facilitate the understanding of the above-mentioned gas pool, the embodiment of the present invention provides a schematic structural diagram of a gas pool as shown in FIG. 3 , and the gas collection assembly also includes movable end covers 1.4 fixed on both sides of the gas pool 1.3. Plane or concave mirrors are fixed on the end caps 1.4. In practical applications, the gas pool 1.3 is detachably connected to the movable end cover 1.4, and the movable end cover 1.4 is provided with a boss, which is bonded to a flat mirror or a concave mirror through the boss to adjust the flat mirror independently. the pitch angle.

In one embodiment, the above-mentioned infrared light source 2.1.1 is used to emit infrared light. Optionally, the infrared light source is a wide-spectrum thermal light source, with wavelengths covering near-infrared to far-infrared, and the light source driver 2.1.4 can be used to power the infrared light source and perform temperature control at the same time.

In an embodiment, the above-mentioned optical chopper 2.1.2 is used to modulate the infrared light emitted by the infrared light source to obtain modulated light of a specific spectral band. In practical applications, the infrared light emitted by the above-mentioned infrared light source may be continuous light, and the optical chopper device modulates the continuous light emitted by the infrared light source into periodic discontinuous light with a certain frequency (such as 100 Hz to several thousand Hz) (ie, , the modulated light of the above-mentioned specific spectrum). In addition, the optical chopper can also output a modulation frequency. Specifically, the above-mentioned periodic intermittent light is directly converted into an alternating current signal through mechanical chopping, and the chopping frequency is adjusted by controlling the rotational speed of the optical chopper, thereby Get the modulation frequency.

In one embodiment, the above-mentioned reflective element 2.1.3 is used to reflect the modulated light of a specific spectral band to the gas cell, and to emit the modulated light of the specific spectral band of the gas cell to the photodetector. In one embodiment, the reflective element includes a plurality of flat mirrors and a plurality of concave mirrors, and each of the flat mirrors and each of the concave mirrors is coated with a reflective film, and the reflective film may be an aluminum film, a silver film or a gold film etc., the required reflective film may be selected based on the actual situation, which is not limited in this embodiment of the present invention. In order to facilitate the understanding of the above-mentioned reflective element, the embodiment of the present invention provides a schematic structural diagram of a reflective element as shown in FIG. 4 . As shown in FIG. 4 , the reflective element provided by the embodiment of the present invention includes a first plane mirror 2.1 .3.1, second flat mirror 2.1.3.2, first concave mirror 2.1.3.3, second concave mirror 2.1.3.4, third concave mirror 2.1.3.5 and third flat mirror 2.1.3.6, each reflection The mirrors are arranged at a certain angle, and the optical path is turned through the reflection principle, and is reflected multiple times in the gas cell to reflect the modulated light of a specific spectral band to the gas cell, and to pass the modulated light of a specific spectral band through the gas cell. emitted to the photodetector. In addition, the reflector can be glued to the mirror base, which is mounted in the gas cell by means of screws.

For the gas detection assembly provided by the above-mentioned embodiment, the working process is as follows: after the continuous light emitted by the infrared light source is modulated, after the continuous light emitted by the first plane reflector, the second plane reflector, the first concave reflector, and the second concave reflector , the third concave reflector and the third plane reflector are reflected multiple times in the reflection system, and finally converge to the infrared detector (that is, the above-mentioned light detector). Infrared light penetrates the gas exhaled by the tested person collected in the gas pool. If it contains alcohol gas, the infrared light is absorbed by the alcohol gas, the light intensity is weakened, and the light intensity signal changes greatly. If there is no alcohol gas, the infrared light is only weakly affected by the system, and the change of the light intensity signal is small. By comparing the light intensity signal received by the infrared detector, the gas exhaled by the tested person is detected.

In one embodiment, the above-mentioned light detector 2.2 may be a modular infrared spectrometer, or an integrated multi-channel single-point spectral detector. The infrared detector driver can provide signal demodulation function and signal conditioning function, or only provide signal conditioning function, so as to improve the signal-to-noise ratio through the above functions. In addition, the above-mentioned detector driver 2.3 can be used to power the photodetector 2.2.

In one embodiment, the fingerprint collecting device 4.1 in the above fingerprint collecting component 4 is used to collect the fingerprint of the tested person, the fingerprint information storage unit 4.2 is used to store the fingerprint information of the tested person, and the fingerprint information storage unit is also the fingerprint database. . In practical applications, the fingerprint of the tested person is automatically collected by the fingerprint collector 4.1. If the fingerprint information of the tested person is successfully collected three times in a row, the three collection results are combined into a complete fingerprint and stored in the fingerprint information storage unit 4.2. to complete the fingerprint information entry. If the collection fails, it will prompt to collect fingerprints again, the program will automatically compare the fingerprint information in the fingerprint information database, and display the information of the people who have successfully compared. In addition, after the fingerprint registration of the tested person is successful, there is no need to register again. The next time the test is performed, the fingerprint can be punched directly. The program will automatically compare the punched fingerprint and the fingerprint database information, and finally the information of the tested person will be displayed. If the fingerprint registration is successful and the registration is repeated again, the fingerprint information collected this time can be used to cover the previously collected fingerprint information of the tested person.

In one embodiment, the optical element 5.1 in the body temperature detection assembly 5 is used for converging the infrared rays radiated by the human body, and the infrared sensor 5.2 is used for converting the infrared rays into electrical signals and sending the electrical signals to the signal processing unit. The signal processing unit 5.3 It is used to receive the electrical signal to get the body temperature of the tested person. Further, an embodiment of the present invention also provides a signal processing unit, the signal processing unit may include a signal amplifier, a signal collector and a signal processor, wherein the signal amplifier is used to amplify the electrical signal; the signal collector is used to The amplified electrical signal is processed by analog-to-digital conversion to obtain a digital signal corresponding to the electrical signal; the signal processor is used to obtain the body temperature of the tested person according to the digital signal. In practical applications, the infrared rays radiated by the human body are collected by the optical system to the infrared sensor. The infrared sensor converts the optical signal into an electrical signal for output. The output electrical signal is amplified by the signal amplifier and sent to the signal collector. After analog-to-digital conversion, the It is transmitted to the signal processor, and is converted into the body temperature value of the measured person after algorithm processing (such as look-up table and detector temperature correction algorithm) and emissivity correction in the signal processor. Among them, the above emissivity represents the ability of an object to absorb and emit infrared energy. The surface of an object with different emissivity will radiate different energy under the same conditions such as temperature. Specifically, the higher the emissivity of an object, the radiation of the object. The larger the energy is, in order to compensate the measurement error caused by different emissivity, the emissivity value of the instrument should be adjusted according to the material of the object.

In one embodiment, the above-mentioned data processing component 3 can also be used to collect data of the alcohol gas detection component, the fingerprint collection component and the body temperature detection component, and comprehensively judge whether the breath exhaled by the tested person contains alcohol gas.

In one embodiment, the touch screen 6.1 in the human-machine interface assembly 6 is used to display whether the breath exhaled by the tested person contains alcohol gas and the temperature of the tested person, and the voice broadcasting unit 6.2 is used to prompt the tested person Perform fingerprint detection.

To sum up, the alcohol gas detection device provided by the embodiment of the present invention does not require accessories such as a mouthpiece, and can detect alcohol gas by a non-contact method, that is, the tested person exhales at a certain distance from the device, and the embodiment of the present invention provides The new alcohol gas detection device also has the advantages of fast response, long life and high detection accuracy.

Based on the alcohol detection device provided by the above embodiment, an embodiment of the present invention further provides an alcohol gas detection method, which is applied to the alcohol detection device provided by the above embodiment. Refer to an alcohol gas detection method shown in FIG. 5 . The schematic flowchart of the method mainly includes the following steps S502 to S506:

In step S502, the gas exhaled by the tested person is collected by using the gas collection component. In one embodiment, the water filtration membrane in the gas collection component absorbs the water vapor contained in the gas exhaled by the person under test, and the gas exhaled by the person under test after the water vapor is removed through the air guide hood in the gas collection element Collected into the gas pool to complete the collection process of the gas exhaled by the tested person.

Step S504, using the light source emission unit in the gas detection component to provide modulated light of a specific spectral band, and emit the modulated light of the specific spectral band to the gas collection component, so that the modulated light of the specific spectral band is absorbed in the gas collection component. The collected gas exhaled by the tested person after inhaling the water vapor, and the modulated light intensity of the specific spectral band of the modulated light of the specific spectral band after absorbing the alcohol gas is detected by the photodetector. In one embodiment, after the continuous light emitted by the infrared light source is modulated, it is reflected by the first flat mirror, the second flat mirror, the first concave mirror, the second concave mirror, the third concave mirror and the third concave mirror. There are multiple reflections in the reflection system composed of three plane mirrors, and finally converge to the infrared detector. Infrared light penetrates the gas exhaled by the tested person collected in the gas pool. If the gas exhaled by the tested person contains alcohol, the infrared light will be absorbed by the alcohol gas, resulting in the weakening of the light intensity signal detected by the photodetector and the light intensity. The signal changes greatly. If the gas exhaled by the tested person does not contain alcohol, the infrared light will only be weakly affected by the alcohol gas detection device, and the light intensity signal changes slightly.

Step S506: Receive the modulated light intensity of the specific spectral section after absorbing the alcohol gas sent by the photodetector, and determine whether the breath of the tested person is exhaled according to the change of the light intensity of the modulated light of the specific spectral section before and after absorbing the alcohol gas. Contains alcohol gas, or detects the alcohol gas concentration in the breath exhaled by the tested person.

The embodiment of the present invention provides a specific implementation method for judging whether the breath exhaled by the tested person contains alcohol gas, or detecting the alcohol gas concentration in the gas exhaled by the tested person. When no alcohol gas is collected in the collecting component, the modulated light of a specific spectral band is emitted to the gas collecting component, and the light intensity of the modulated light of the specific spectral band before absorbing the alcohol gas (it can be called the first light intensity signal) is detected. , and when the alcohol gas is collected in the gas collection component, detect the light intensity of the modulated light in a specific spectral band after absorbing the alcohol gas (it can be called the second light intensity signal), and then compare the modulated light in the specific spectral band in The light intensity after absorbing alcohol gas and the light intensity of the modulated light of the specific spectrum after absorbing alcohol gas can be obtained to obtain the detection result of the exhaled gas of the tested person (such as whether the exhaled gas of the tested person contains alcohol gas or The concentration of alcohol gas in the breath exhaled by the tested person). In practical applications, the light intensities of two characteristic spectral channels are extracted from the infrared detector, one of which has an absorption effect on alcohol gas, and the other spectral channel has no absorption on alcohol gas. Under the condition that the alcohol gas is collected in the gas collection component, the photodetector is used to detect the first light intensity signal of the modulated light of the specific spectral band before absorbing the alcohol gas. At this time, two characteristics of the first light intensity signal The spectral channels are respectively denoted as S1 and S2. When the alcohol gas is collected in the gas collection component, the second light intensity signal of the modulated light of a specific spectrum band after absorbing the alcohol gas is detected by the photodetector. The two characteristic spectral channels of the two light intensity signals are denoted as S1' and S2', respectively.

Assume

When k≤k', it means that there is no significant change in the light intensity signal of the spectral channel that absorbs alcohol gas, while the light intensity signal of the spectral channel that does not absorb alcohol gas does not change or the light intensity signal is weakened, so it can be determined The breath exhaled by the tested person does not contain alcohol gas.

When k>k', it means that the light intensity signal of the spectral channel that absorbs alcohol gas is weakened by the alcohol gas absorption, and the light intensity signal of the spectral channel that does not absorb alcohol gas does not change, so it can be determined that the tested person Exhaled breath contains alcohol gas.

The embodiment of the present invention also provides a specific application example of using the above-mentioned alcohol gas detection device to detect the gas exhaled by the tested person: the tested person's finger touches the fingerprint collection component, and the fingerprint database is compared to confirm the tested person's personnel Information; the body temperature detection component starts to detect the body temperature of the tested person. If the tested person's body temperature is normal, the voice broadcast unit prompts the tested person to exhale; the gas detection component judges whether the tested person exhales through the signal change of the light detector. If the breath exhaled by the tested person is collected, the alcohol gas test is performed immediately. The data processing component determines whether the breath exhaled by the tested person contains alcohol gas, and displays the temperature of the tested person and the alcohol gas detection result through the human-machine interface component, such as whether there is alcohol gas in the exhaled gas, or whether there is alcohol gas in the exhaled gas or not. alcohol content, etc.

The above-mentioned alcohol gas detection and detection method provided by the embodiment of the present invention uses the optical detection principle to detect the gas exhaled by the tested person, and has a relatively fast response speed, and because the optical related device has a long life, the embodiment of the present invention can effectively Alleviates the problem of devices requiring periodic calibration or updating of optically related components. In addition, when the alcohol gas detection device provided by the embodiment of the present invention performs detection, the detection can be realized without contacting the alcohol gas with the optical element. Therefore, the alcohol detection result of the above-mentioned device provided by the embodiment of the present invention is not affected by the optical correlation between the alcohol gas and the optical element. The contact degree of the device is affected, and the alcohol detection result has a high accuracy.

Finally, it should be noted that the above-mentioned embodiments are only specific implementations of the present invention, and are used to illustrate the technical solutions of the present invention, but not to limit them. The protection scope of the present invention is not limited thereto, although referring to the foregoing The embodiment has been described in detail the present invention, and those of ordinary skill in the art should understand: any person skilled in the art who is familiar with the technical field of the present invention can still modify the technical solutions described in the foregoing embodiments within the technical scope disclosed by the present invention. Or can easily think of changes, or equivalently replace some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered in the present invention. within the scope of protection. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. The alcohol gas detection device is characterized by comprising a gas collection assembly, a gas detection assembly and a data processing assembly which are fixed in sequence; wherein,

the gas collecting assembly is used for collecting gas exhaled by a tested person;

the gas detection assembly comprises a light source emission unit and a light detector; the light source emission unit is used for providing modulatable light with a specific spectrum band and emitting the modulatable light with the specific spectrum band to the gas collection assembly, so that the modulatable light with the specific spectrum band absorbs the gas, collected in the gas collection assembly, exhaled by the person to be tested after water vapor is absorbed; the optical detector is used for detecting the modulatable light intensity of a specific spectrum band after the alcohol gas is absorbed and sending the modulatable light intensity to the data processing component;

the data processing assembly is used for receiving the modulatable light intensity of the specific spectrum band after the alcohol gas is absorbed, and judging whether the gas exhaled by the tested person contains the alcohol gas or not or detecting the concentration of the alcohol gas in the gas exhaled by the tested person according to the light intensity change of the modulatable light of the specific spectrum band before and after the alcohol gas is absorbed.

2. The apparatus of claim 1, wherein the gas collection assembly comprises a water filtration membrane, a gas guide hood and a gas tank which are fixed in sequence; wherein,

the water filtering membrane is used for filtering water vapor contained in gas exhaled by the tested person;

the gas guide cover adopts a closing-up structure and is used for guiding gas exhaled by the tested person into the gas pool;

the gas pool is used for collecting gas exhaled by the tested person.

3. The apparatus of claim 2, wherein the light source emitting unit comprises an infrared light source, an optical chopper, and a reflecting element; wherein,

the infrared light source is used for emitting infrared light with a specific spectrum band;

the optical chopper is used for modulating the infrared light to obtain modulated light with a specific spectrum band;

the reflecting element is used for reflecting the modulatable light of the specific spectrum band to the gas cell and emitting the modulatable light of the specific spectrum band passing through the gas cell to the light detector.

4. The apparatus of claim 3, wherein the reflective element comprises a plurality of planar mirrors and a plurality of concave mirrors; each of the planar reflectors and each of the concave reflectors are plated with a reflective film;

the gas collecting assembly further comprises movable end covers fixed on two sides of the gas pool, and the plane reflector or the concave reflector is fixed on each movable end cover.

5. The apparatus of claim 1, further comprising a fingerprint acquisition assembly, the fingerprint acquisition assembly comprising a fingerprint acquirer and a fingerprint information storage unit; wherein,

the fingerprint acquisition instrument is used for acquiring the fingerprint of the person to be detected;

the fingerprint information storage unit is used for storing the fingerprint information of the tested person.

6. The device of claim 1, further comprising a body temperature detection assembly comprising an optical element, an infrared sensor, and a signal processing unit; wherein,

the optical element is used for converging infrared rays radiated by the tested person;

the infrared sensor is used for converting the infrared rays into electric signals and sending the electric signals to the signal processing unit;

the signal processing unit is used for receiving the electric signal and converting the electric signal into the body temperature of the person to be measured.

7. The apparatus of claim 6, wherein the signal processing unit comprises a signal amplifier, a signal collector and a signal processor; wherein,

the signal amplifier is used for amplifying the electric signal;

the signal collector is used for carrying out analog-to-digital conversion processing on the amplified electric signal to obtain a digital signal corresponding to the electric signal;

and the signal processor is used for converting the digital signal to obtain the body temperature of the tested person.

8. The device of claim 1, further comprising a human-computer interaction component, wherein the human-computer interaction component comprises a touch display screen and a voice broadcast unit; wherein,

the touch display screen is used for displaying whether the gas exhaled by the tested person contains alcohol gas and the body temperature of the person;

the voice broadcasting unit is used for prompting the tested personnel to carry out fingerprint detection.

9. An alcohol gas detection method applied to the alcohol gas detection apparatus according to any one of claims 1 to 8, the method comprising:

collecting gas exhaled by a person to be detected by using a gas collecting assembly;

providing modulatable light with a specific spectrum band by using a light source emitting unit in a gas detection assembly, emitting the modulatable light with the specific spectrum band to a gas collection assembly so that the modulatable light with the specific spectrum band absorbs gas, collected in the gas collection assembly, exhaled by a person to be detected after water vapor is absorbed, and detecting the modulatable light intensity with the specific spectrum band after alcohol gas is absorbed by using a light detector;

and receiving the modulated light intensity of the specific spectrum band after the alcohol gas is absorbed, and judging whether the gas exhaled by the detected person contains the alcohol gas or not or detecting the concentration of the alcohol gas in the gas exhaled by the detected person according to the light intensity change of the modulated light of the specific spectrum band before and after the alcohol gas is absorbed.

10. The method of claim 9, wherein the step of determining whether the alcohol gas is contained in the exhaled air of the person under test or detecting the alcohol gas concentration in the exhaled air of the person under test based on the change in light intensity of the modulated light of the specific spectrum before and after the absorption of the alcohol gas comprises:

detecting, with the light detector, a light intensity of the modulatable light of the particular spectral band prior to absorption of the alcohol gas in the absence of alcohol gas in the gas collection assembly;

detecting, with the light detector, a light intensity of the modulatable light of the particular spectral band after absorption of the alcohol gas, with the alcohol gas collected in the gas collection assembly;

and judging whether the gas exhaled by the tested person contains alcohol gas or not according to the light intensity change of the modulated light in the specific spectrum before and after the modulated light absorbs the alcohol gas, or detecting the concentration of the alcohol gas in the gas exhaled by the tested person.

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