CN111208065A - Drunk driving remote measuring method, device and system - Google Patents
Drunk driving remote measuring method, device and system Download PDFInfo
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- CN111208065A CN111208065A CN202010145770.0A CN202010145770A CN111208065A CN 111208065 A CN111208065 A CN 111208065A CN 202010145770 A CN202010145770 A CN 202010145770A CN 111208065 A CN111208065 A CN 111208065A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N2021/1757—Time modulation of light being essential to the method of light modification, e.g. using single detector
Abstract
The invention provides a drunk driving remote measuring method, a drunk driving remote measuring device and a drunk driving remote measuring system, and relates to the technical field of drunk driving detection, wherein the drunk driving remote measuring method comprises the steps of obtaining a first harmonic signal and a second harmonic signal which are sent by a drunk driving remote measuring system; the first harmonic signal and the second harmonic signal are obtained by preprocessing mid-infrared laser passing through a detected vehicle; calculating an alcohol concentration length product according to the first harmonic signal and the second harmonic signal; and judging whether the detected vehicle contains alcohol according to the alcohol concentration length product so as to judge whether the vehicle is suspected to be drunk or not. The invention can improve the detection efficiency, improve the detection accuracy and avoid missing detection.
Description
Technical Field
The invention relates to the technical field of drunk driving detection, in particular to a drunk driving remote measuring method, device and system.
Background
Drunk driving is easy to cause serious traffic accidents, and the death rate is high, so drunk driving behaviors must be stringently stricken. At present, the drunk driving judgment method mainly measures the alcohol concentration in human blood directly or indirectly, such as a blood assay method, an expiration detection method, an alcohol test paper method and the like, and the methods all need manual detection on site or in a laboratory, so that the method is time-consuming and labor-consuming, low in detection efficiency and has the condition of missed detection.
Disclosure of Invention
The invention aims to provide a drunk driving remote measuring method, a drunk driving remote measuring device and a drunk driving remote measuring system, which can improve the detection efficiency, improve the detection accuracy and avoid missed detection.
In a first aspect, an embodiment provides a drunk driving telemetry method, including:
acquiring a first harmonic signal and a second harmonic signal sent by a drunk driving remote measuring system; the first harmonic signal and the second harmonic signal are obtained by preprocessing mid-infrared laser passing through a detected vehicle;
calculating an alcohol concentration length product according to the first harmonic signal and the second harmonic signal;
and judging whether the detected vehicle contains alcohol or not according to the alcohol concentration length product so as to judge whether the vehicle owner is suspected to be drunk.
In an alternative embodiment, the alcohol concentration length product is calculated according to the following equation:
wherein C represents alcohol concentration, L represents alcohol gas width, C L represents alcohol concentration length product, S1fRepresenting the first harmonic signal, S2fRepresents the second harmonic signal, k represents the first order correction coefficient, and b represents the correction constant.
In a second aspect, an embodiment provides a drunk driving telemetry device, comprising:
the acquisition module is used for acquiring a first harmonic signal and a second harmonic signal which are sent by the drunk driving remote measuring system; the first harmonic signal and the second harmonic signal are obtained by preprocessing mid-infrared laser passing through a detected vehicle;
the calculation module is used for calculating an alcohol concentration length product according to the first harmonic signal and the second harmonic signal;
and the judging module is used for judging whether the detected vehicle contains alcohol according to the alcohol concentration length product so as to judge whether the driver is suspected to be drunk and driven.
In a third aspect, embodiments provide a drunk driving telemetry system, comprising a laser detection module, a reflection module, and a telemetry device as described in the previous embodiments;
the laser detection module is connected with the remote measuring device and used for transmitting a mid-infrared laser signal to a vehicle to be measured, receiving the mid-infrared laser signal reflected by the reflection module and preprocessing the received mid-infrared laser signal to obtain a first harmonic signal and a second harmonic signal;
the reflection module is used for receiving the intermediate infrared laser signal emitted to the detected vehicle by the laser detection module and reflecting the intermediate infrared laser signal to the laser detection module;
and the remote measuring device is used for judging whether the detected vehicle contains alcohol or not according to the first harmonic signal and the second harmonic signal so as to judge whether the driver is suspected to be drunk or not.
In an optional embodiment, the laser detection module comprises a mid-infrared laser emission module, a laser collimation and convergence module, a detector module and a pretreatment module;
the intermediate infrared laser emission module is used for emitting intermediate infrared laser;
the laser collimation and convergence module is used for collimating and converging the mid-infrared laser emitted by the mid-infrared laser emission module to emit parallel mid-infrared laser to the reflection module; receiving the parallel mid-infrared laser reflected by the reflection module, and converging the received parallel mid-infrared laser to a focus;
the detector module is used for modulating the mid-infrared laser converged at the focus, converting the modulated mid-infrared laser into a modulated electric signal, and conditioning the modulated electric signal to obtain a conditioned signal;
the preprocessing module is used for demodulating the conditioning signal into a first harmonic signal and a second harmonic signal.
In an alternative embodiment, the reflection module comprises at least two reflection sub-modules; the number of the reflection sub-modules is matched with the distance between the reflection module and the laser detection module.
In an alternative embodiment, the mid-infrared laser emission module comprises a laser driver, a mid-infrared laser, and an infrared fiber;
the laser driver is used for providing driving voltage for the intermediate infrared laser;
the intermediate infrared laser is used for emitting intermediate infrared laser;
the infrared optical fiber is used for transmitting the mid-infrared laser emitted by the mid-infrared laser to the laser collimation and convergence module.
In an alternative embodiment, the laser collimating and condensing module includes a convex lens and a collimator;
the collimator is used for receiving the mid-infrared laser transmitted by the infrared optical fiber, collimating the received mid-infrared laser and then transmitting parallel mid-infrared laser;
the convex lens is used for receiving the intermediate infrared laser reflected by the reflection module and converging the reflected intermediate infrared laser to a focus.
In an alternative embodiment, the detector module comprises a single-point infrared detector and a detector driving module;
the single-point infrared detector is used for modulating the mid-infrared laser reflected by the laser collimation and convergence module to obtain a modulated electric signal;
and the detector driving module is used for amplifying and filtering the modulated electric signal modulated by the single-point infrared detector to obtain a conditioned signal.
The drunk driving remote measuring method, the drunk driving remote measuring device and the drunk driving remote measuring system can transmit mid-infrared laser signals to a vehicle to be measured; the device can reflect the intermediate infrared laser signal sent by the laser detection module; the laser detection module receives the signal reflected by the reflection module and then carries out pretreatment to obtain a first harmonic signal and a second harmonic signal; the drunk driving detection result can be obtained according to the first harmonic signal and the second harmonic signal so as to judge whether the detected vehicle contains alcohol or not. The invention can improve the detection efficiency, improve the detection accuracy and avoid missing detection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a drunk driving telemetry method according to an embodiment of the present invention;
fig. 2 is a system schematic diagram of a drunk driving telemetering device provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a drunk driving telemetry system according to an embodiment of the present invention;
fig. 4 is another schematic structural diagram of a drunk driving telemetry system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Icon: 10-a laser detection module; 11-convex lens; 12-a laser driver; 13-mid-infrared laser; 14-a collimator; 15-infrared optical fiber; 16-single point infrared detector; 17-a detector drive module; 18-a pre-treatment module; 20-a reflective module; 21-an acquisition module; 22-a calculation module; 23-a judgment module; 30-a telemetry device; 40-a license plate recognition module; 400-an electronic device; 401 — a communication interface; 402-a processor; 403-a memory; 404-bus.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
At present, when a traffic management department detects drunk driving of a driver, manual detection is usually adopted, time and labor are wasted, the detection accuracy rate is low, and the condition of missed detection exists.
Some patents in China propose a mode of detecting drunk driving by adopting a laser, but the adopted near-infrared lasers are extremely low in sensitivity to alcohol, are easily affected by water vapor and are extremely high in false detection rate, so that the method is not suitable for drunk driving remote measurement, and mature drunk driving remote measurement product application based on the near-infrared laser is not found.
Based on this, the embodiment provides a drunk driving remote measuring method, device and system, which can improve detection efficiency, improve detection accuracy, and avoid missed detection, and the invention is described in detail through the following embodiments.
Referring to fig. 1, an embodiment provides a drunk driving telemetry method, including:
step S110, acquiring a first harmonic signal and a second harmonic signal sent by a drunk driving remote measuring system; the first harmonic signal and the second harmonic signal are obtained by preprocessing mid-infrared laser passing through a detected vehicle;
step S120, calculating alcohol concentration length product according to the first harmonic signal and the second harmonic signal;
and step S130, judging whether the detected vehicle contains alcohol according to the alcohol concentration length product so as to judge whether the vehicle owner is suspected to be drunk.
Specifically, in the present embodiment, drunk driving telemetry is performed according to a first harmonic signal and a second harmonic signal demodulated from a mid-infrared laser signal, where the second harmonic signal is sensitive to alcohol concentration and is proportional to alcohol concentration and laser intensity, and the first harmonic signal is insensitive to alcohol concentration and is proportional to laser intensity. Based on this, in the present embodiment, the alcohol concentration length product is calculated from the first harmonic signal and the second harmonic signal, and it is determined whether or not the vehicle contains alcohol based on the alcohol concentration length product. Namely, when the alcohol concentration length product is larger than the preset threshold value, the vehicle is judged to contain alcohol.
Alternatively, in step S120 of the above embodiment, the alcohol concentration length product is calculated according to the following formula:
wherein C represents alcohol concentration, L represents alcohol gas width, C L represents alcohol concentration length product, S1fRepresenting the first harmonic signal, S2fRepresents the second harmonic signal, k represents the first order correction coefficient, and b represents the correction constant.
Specifically, k and b are values obtained by a plurality of tests in the test stage. In the testing stage, under the premise of knowing the alcohol concentration and the alcohol gas width, the k value and the b value are obtained through multiple measurements.
Referring to fig. 2, an embodiment provides a drunk driving telemetry device, including:
the acquisition module 21 is used for acquiring a first harmonic signal and a second harmonic signal sent by the drunk driving remote measuring system; the first harmonic signal and the second harmonic signal are obtained by preprocessing mid-infrared laser passing through a detected vehicle;
a calculation module 22, configured to calculate an alcohol concentration length product according to the first harmonic signal and the second harmonic signal;
and the judging module 23 is configured to judge whether the detected vehicle contains alcohol according to the alcohol concentration length product, so as to judge whether the driver is suspected to be drunk.
Alternatively, in the calculation module 22 of the above embodiment, the alcohol concentration length product is calculated according to the following formula:
wherein C represents alcohol concentration, L represents alcohol gas width, C L represents alcohol concentration length product, S1fRepresenting the first harmonic signal, S2fRepresents the second harmonic signal, k represents the first order correction coefficient, and b represents the correction constant.
Referring to fig. 3, an embodiment provides a drunk driving telemetry system, including a laser detection module, a reflection module, and a telemetry device as in the previous embodiment;
the laser detection module 10 is connected with the remote measuring device 30 and is used for transmitting a mid-infrared laser signal to the vehicle to be detected, receiving the mid-infrared laser signal reflected by the reflection module 20, and preprocessing the received mid-infrared laser signal to obtain a first harmonic signal and a second harmonic signal;
the reflection module 20 is configured to receive a mid-infrared laser signal emitted by the laser detection module 10 to the vehicle to be detected, and reflect the mid-infrared laser signal to the laser detection module 10;
and the remote measuring device 30 is used for judging whether the detected vehicle contains alcohol or not according to the first harmonic signal and the second harmonic signal so as to judge whether the driver is suspected to be drunk or not.
Specifically, the wavelength of the mid-infrared laser signal transmitted by the laser detection module 10 of this embodiment is 3300nm to 3500 nm. Alcohol has strong absorption in infrared laser with the mid-infrared spectrum wavelength of 3300nm to 3500nm, so that a laser with a suitable peak wavelength between 3300nm and 3500nm can be selected for alcohol detection, for example, a laser with a peak wavelength of 3345nm or 3390nm is selected, but not limited to the above two.
The laser detection module 10 of this embodiment is a tunable laser, which is a laser capable of continuously changing the output wavelength of the laser within a certain range. The laser has wide application, and can be used for spectroscopy, photochemistry, medicine, biology, integrated optics, pollution monitoring, semiconductor material processing, information processing, communication and the like.
According to the embodiment, the tunable characteristic of the laser is utilized, the laser is modulated in a wavelength modulation spectrum mode, the infrared detector is utilized to receive the modulated laser signal, the first harmonic and the second harmonic of the laser signal can be obtained, the harmonic signal comprises an alcohol concentration signal, and the alcohol concentration can be inverted according to the beer Lambert law and a specific fitting algorithm, so that whether the alcohol is contained in the vehicle or not can be judged.
The embodiment can transmit a mid-infrared laser signal to the detected vehicle through the laser detection module 10; the middle infrared laser signal sent by the laser detection module 10 is reflected by the reflection module 20; the laser detection module 10 receives the signal reflected by the reflection module 20 and then carries out preprocessing to obtain a first harmonic signal and a second harmonic signal; then, the drunk driving detection result can be obtained through the telemetering device 30 according to the first harmonic signal and the second harmonic signal so as to judge whether the detected vehicle contains alcohol or not. The invention can improve the detection efficiency, improve the detection accuracy and avoid missing detection.
Optionally, the laser detection module 10 in the above implementation includes a mid-infrared laser emission module, a laser collimation and convergence module, a detector module, and a preprocessing module 18;
the middle infrared laser emission module is used for emitting middle infrared laser;
the laser collimation and convergence module is used for collimating and converging the mid-infrared laser emitted by the mid-infrared laser emission module to emit parallel mid-infrared laser to the reflection module 20; receiving the parallel mid-infrared laser light reflected by the reflection module 20, and converging the received parallel mid-infrared laser light to a focus;
the detector module is used for modulating the mid-infrared laser converged at the focus, converting the modulated mid-infrared laser into a modulated electric signal, and conditioning the modulated electric signal to obtain a conditioned signal;
and a preprocessing module 18 for demodulating the conditioned signal into a first harmonic signal and a second harmonic signal.
Specifically, the laser detection module 10 of the present embodiment emits mid-infrared laser light through the mid-infrared laser emission module, sends the emitted laser light to the reflection module 20 in parallel through the laser collimation and convergence module, receives the reflected mid-infrared laser light through the detector module, and modulates the reflected mid-infrared laser light into a modulation electrical signal; the modulated electrical signals are converted to first and second harmonic signals by the pre-processing module 18.
The second harmonic signal is sensitive to alcohol concentration and is in direct proportion to the alcohol concentration and the laser intensity, the first harmonic signal is insensitive to the alcohol concentration and is in direct proportion to the laser intensity, and according to the principle, the first harmonic signal and the second harmonic signal are detected through the remote measuring device 30 to judge whether the detected vehicle contains alcohol or not.
Compared with the adoption of manual detection, the alcohol telemetering is carried out by adopting the mid-infrared laser, the accuracy rate is higher, and missing detection is avoided.
Optionally, the reflection module 20 in the above implementation includes at least two reflection sub-modules; the number of reflection sub-modules is adapted to the distance between the reflection module 20 and the laser detection module 10.
Specifically, a plurality of reflection modules 20 may be provided, and in fig. 2, two reflection modules 20 may be provided and may be adjusted according to a distance from the laser detection module 10. Generally, the number of the reflection modules 20 is about 3.
Optionally, the mid-infrared laser emission module in the above implementation includes a laser driver 12, a mid-infrared laser 13, and an infrared optical fiber 15;
a laser driver 12 for supplying a driving voltage to the mid-infrared laser 13;
a mid-infrared laser 13 for emitting mid-infrared laser light;
and the infrared optical fiber 15 is used for transmitting the mid-infrared laser emitted by the mid-infrared laser 13 to the laser collimation and convergence module.
Specifically, the laser driver 12 controls the mid-infrared laser 13 to emit modulated mid-infrared laser light.
The mid-infrared laser light is quasi-transmitted to the collimator 14 through the infrared fiber 15.
Optionally, the laser collimating and converging module in the above implementation includes a convex lens 11 and a collimator 14;
the collimator 14 is used for receiving the mid-infrared laser transmitted by the infrared fiber 15, collimating the received mid-infrared laser and then transmitting parallel mid-infrared laser;
and the convex lens 11 is used for receiving the mid-infrared laser light reflected by the reflection module 20 and converging the reflected mid-infrared laser light to a focus.
Specifically, the collimator 14 is configured to collimate the mid-infrared laser light sent by the infrared fiber 15 and then parallel to the emission value reflection module 20. The convex lens 11 is used for receiving the parallel mid-infrared laser light reflected by the reflection module 20 and converging the parallel mid-infrared laser light to a focus.
Optionally, the detector module in the above implementation includes a single-point infrared detector 16 and a detector driving module 17;
the single-point infrared detector 16 is used for modulating the mid-infrared laser reflected by the laser collimation and convergence module to obtain a modulated electric signal;
and the detector driving module 17 is configured to amplify and filter the modulated electrical signal modulated by the single-point infrared detector 16 to obtain a conditioned signal.
Specifically, the single-point infrared detector 16 converts the modulated laser signal into a modulated electrical signal, and the modulated electrical signal is conditioned (i.e., amplified and filtered) by the detector driving module 17 and enters the embedded processor.
Referring to fig. 4, optionally, the drunk driving telemetry system of the above embodiment further includes a license plate recognition module 40;
and the license plate recognition module 40 is used for recording the license plate information of the detected vehicle.
Specifically, referring to fig. 4, the laser detection module 10 and the reflection module 20 are respectively disposed at two ends of a road, when a vehicle passes through the drunk driving remote measurement system of the embodiment, the license plate recognition module 40 recognizes a license plate and informs the remote measurement device 30 to control the laser detection module 10 to start working, the remote measurement device 30 collects signals of the laser detection module 10 to perform analysis processing, and when the vehicle containing alcohol is found, the drunk driving detection result is sent to a remote monitoring center (such as a traffic police monitoring platform or a terminal for alarming) in real time in a wired or wireless network manner.
Optionally, telemetry device 30 in the above implementation includes an embedded processor.
Specifically, the embedded processor demodulates the modulated electrical signal to obtain a first harmonic signal and a second harmonic signal of the modulated laser signal, and transmits the first harmonic signal and the second harmonic signal to the telemetry device 30.
Referring to fig. 5, an embodiment of the present invention further provides an electronic device 400, which includes a communication interface 401, a processor 402, a memory 403, and a bus 404, where the processor 402, the communication interface 401, and the memory 403 are connected by the bus 404; the memory 403 is used to store computer programs that enable the processor 402 to execute the drunk driving telemetry method, and the processor 402 is configured to execute the programs stored in the memory 403.
Optionally, embodiments of the present invention further provide a computer readable medium having non-volatile program code executable by a processor, the program code causing the processor to execute the drunk driving telemetry method as in the above embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A drunk driving telemetry method, comprising:
acquiring a first harmonic signal and a second harmonic signal sent by a drunk driving remote measuring system; the first harmonic signal and the second harmonic signal are obtained by preprocessing mid-infrared laser passing through a detected vehicle;
calculating an alcohol concentration length product according to the first harmonic signal and the second harmonic signal;
and judging whether the detected vehicle contains alcohol or not according to the alcohol concentration length product so as to judge whether the vehicle owner is suspected to be drunk.
2. The method of claim 1, wherein the alcohol concentration length product is calculated according to the following equation:
wherein C represents alcohol concentration, L represents alcohol gas width, C L represents alcohol concentration length product, S1fRepresenting the first harmonic signal, S2fRepresents the second harmonic signal, k represents the first order correction coefficient, and b represents the correction constant.
3. A drunk driving telemetry device, comprising:
the acquisition module is used for acquiring a first harmonic signal and a second harmonic signal which are sent by the drunk driving remote measuring system; the first harmonic signal and the second harmonic signal are obtained by preprocessing mid-infrared laser passing through a detected vehicle;
the calculation module is used for calculating an alcohol concentration length product according to the first harmonic signal and the second harmonic signal;
and the judging module is used for judging whether the detected vehicle contains alcohol according to the alcohol concentration length product so as to judge whether the driver is suspected to be drunk and driven.
4. The apparatus of claim 3, wherein the alcohol concentration length product is calculated according to the following equation:
wherein C represents alcohol concentration, L represents alcohol gas width, C L represents alcohol concentration length product, S1fRepresenting the first harmonic signal, S2fRepresents the second harmonic signal, k represents the first order correction coefficient, and b represents the correction constant.
5. A drunk driving telemetry system comprising a laser detection module, a reflection module and a telemetry device as claimed in claim 3;
the laser detection module is connected with the remote measuring device and used for transmitting a mid-infrared laser signal to a vehicle to be measured, receiving the mid-infrared laser signal reflected by the reflection module and preprocessing the received mid-infrared laser signal to obtain a first harmonic signal and a second harmonic signal;
the reflection module is used for receiving the intermediate infrared laser signal emitted to the detected vehicle by the laser detection module and reflecting the intermediate infrared laser signal to the laser detection module;
and the remote measuring device is used for judging whether the detected vehicle contains alcohol or not according to the first harmonic signal and the second harmonic signal so as to judge whether the driver is suspected to be drunk or not.
6. The system of claim 5, wherein the laser detection module comprises a mid-infrared laser emission module, a laser collimation and convergence module, a detector module, and a pre-processing module;
the intermediate infrared laser emission module is used for emitting intermediate infrared laser;
the laser collimation and convergence module is used for collimating and converging the mid-infrared laser emitted by the mid-infrared laser emission module to emit parallel mid-infrared laser to the reflection module; receiving the parallel mid-infrared laser reflected by the reflection module, and converging the received parallel mid-infrared laser to a focus;
the detector module is used for modulating the mid-infrared laser converged at the focus, converting the modulated mid-infrared laser into a modulated electric signal, and conditioning the modulated electric signal to obtain a conditioned signal;
the preprocessing module is used for demodulating the conditioning signal into a first harmonic signal and a second harmonic signal.
7. The system of claim 5, wherein the reflection module comprises at least two reflection sub-modules; the number of the reflection sub-modules is matched with the distance between the reflection module and the laser detection module.
8. The system of claim 6, wherein the mid-infrared laser emission module comprises a laser driver, a mid-infrared laser, and an infrared fiber;
the laser driver is used for providing driving voltage for the intermediate infrared laser;
the intermediate infrared laser is used for emitting intermediate infrared laser;
the infrared optical fiber is used for transmitting the mid-infrared laser emitted by the mid-infrared laser to the laser collimation and convergence module.
9. The system of claim 6, wherein the laser collimating and condensing module comprises a convex lens and a collimator;
the collimator is used for receiving the mid-infrared laser transmitted by the infrared optical fiber, collimating the received mid-infrared laser and then transmitting parallel mid-infrared laser;
the convex lens is used for receiving the intermediate infrared laser reflected by the reflection module and converging the reflected intermediate infrared laser to a focus.
10. The system of claim 6, wherein the detector module comprises a single point infrared detector and a detector driver module;
the single-point infrared detector is used for modulating the mid-infrared laser reflected by the laser collimation and convergence module to obtain a modulated electric signal;
and the detector driving module is used for amplifying and filtering the modulated electric signal modulated by the single-point infrared detector to obtain a conditioned signal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113758898A (en) * | 2020-06-05 | 2021-12-07 | 清华大学 | Drunk driving detection method and system |
| CN114384044A (en) * | 2021-12-30 | 2022-04-22 | 北京无线电计量测试研究所 | Remote alcohol gas concentration measuring device and control method thereof |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113758898A (en) * | 2020-06-05 | 2021-12-07 | 清华大学 | Drunk driving detection method and system |
| CN113758898B (en) * | 2020-06-05 | 2022-09-06 | 清华大学 | Drunk driving detection method and system |
| CN114384044A (en) * | 2021-12-30 | 2022-04-22 | 北京无线电计量测试研究所 | Remote alcohol gas concentration measuring device and control method thereof |
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