Laser real-time online drunk driving detection device and method

Abstract

The invention provides a laser real-time online drunk driving detection device and method.The device comprises a control unit, a laser unit, a first light path unit, a second light path unit, a light path merging unit and a receiving unit, the light intensity change is alternately recorded by switching two light paths or the light intensity change of ethanol exhaled by a driver in a to-be-detected area is recorded at the same time; and the ethanol content is calculated in the receiving unit according to the change of the light intensity, and various complex high-order frequency sweeping function requirements of the laser are not needed in the process, so that the structure of the device is simplified, and the cost is further reduced. The ethanol data result is transmitted only through one receiving unit, so that the data transmission bandwidth resource demand is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of ethanol detection, and in particular relates to a laser real-time online drunk driving detection device and method. Background Art

[0002] Tunable Diode Laser Absorption Spectroscopy, abbreviated as TDLAS (tunable semiconductor laser spectroscopy), has been widely used in specific types of gas detection, including online monitoring of automobile exhaust nitrogen oxides, human exhaled methane concentration detection, gas remote sensing system analysis, etc. In the detection process, a variety of special absorption wavelength lasers are matched in a targeted manner according to the type of gas to be tested, and the output wavelength of the laser is controlled by frequency modulation. The light waves with power changes at different frequencies of the laser beam passing through the area to be tested are scanned, and the real-time changes in the concentration of various gases to be tested in the area to be tested are solved according to the data of each light wave combined with a specific set of material equations. However, this calculation method is relatively complicated, and the high-frequency modulation technology laser used to suppress noise and obtain extremely high sensitivity will also lead to a high cost of the TDLAS system. Summary of the invention

[0003] In view of the above problems, the present invention proposes a laser real-time online drunk driving detection device, comprising:

[0004] Control unit;

[0005] A laser unit connected to the control unit so that the control unit controls the laser unit to turn on and off;

[0006] A first optical path unit, when the first optical path unit is connected to the control unit, so that the control unit controls the amount of light entering the optical path, and the laser unit is connected to the first optical path unit to provide a first light source;

[0007] A first optical path unit, when the first optical path unit is connected to the control unit so that the control unit controls the amount of light entering the optical path, the laser unit is connected to the first optical path unit to provide a first light source, and the first optical path unit is arranged side by side with the first optical path unit;

[0008] An optical path merging unit, wherein the outgoing light beams of the first optical path unit and the second optical path unit are alternately emitted from the optical path merging unit to the area to be measured;

[0009] A receiving unit is arranged at an interval with the optical path merging unit, and the area to be tested is located between the optical path merging unit and the receiving unit, so that the receiving unit receives the power change of the detection light beam to calculate the ethanol content of the two optical paths in sequence;

[0010] Or when the control unit is not connected to the first optical path unit and the second optical path unit, so that the receiving unit simultaneously receives the power change of the detection light beam and calculates the ethanol content of the two optical paths at the same time, the receiving unit is connected to the control unit to transmit the calculated ethanol content to the control unit to provide a basis for law enforcement.

[0011] Optionally, when the control unit is respectively connected to the first optical path unit and the second optical path unit, the first optical path unit includes a first collimator, a first two-dimensional adjustment member, a first shutter and a first half-wave plate which are arranged in sequence at intervals, the control unit is connected to the first shutter to control the amount of light entering so that the light beams emitted from the two optical paths can be alternately incident on the receiving unit through the optical path merging unit, the laser unit is connected to the first collimator, and the light of the first half-wave plate is emitted to the optical path merging unit.

[0012] Optionally, the first optical path unit and the second optical path unit have the same structure.

[0013] Optionally, when the control unit is respectively connected to the first optical path unit and the first optical path unit, the receiving unit includes a first photoelectric probe and a first recorder connected to each other, the optical path merging unit is connected to the first photoelectric probe, and the first recorder is connected to the control unit.

[0014] Optionally, the optical path merging unit includes a first beam-combining prism and a first reflector that are arranged at intervals, the first beam-combining prism is arranged at intervals behind the first optical path unit to emit the first light source from the first beam-combining prism to the area to be measured, the first reflector is arranged at intervals behind the first optical path unit, the first light source is entered into the first beam-combining prism through the first reflector to be emitted to the area to be measured through the first beam-combining prism.

[0015] Optionally, the control unit includes an industrial computer and a shutter controller connected to each other, the industrial computer is connected to the receiving unit and the laser unit respectively, and the shutter controller is connected to the first optical path unit and the first optical path unit respectively.

[0016] Optionally, the laser unit includes a first laser, a first pigtail and a second pigtail, one end of the first pigtail is connected to the first optical path unit, one end of the second pigtail is connected to the first optical path unit, and the first laser is respectively connected to the other ends of the first pigtail and the second pigtail to generate two light waves.

[0017] Optionally, when the control unit is not connected to the first optical path unit and the first optical path unit, the first optical path unit includes a first collimating mirror, a first two-dimensional adjustment member and a first half-wave plate which are arranged in sequence and spaced apart, the laser unit is connected to the first collimating mirror, the first half-wave plate is located after the optical path merging unit, and the light of the first half-wave plate is emitted to the optical path merging unit, so that the light beams emitted from the first half-wave plate and the first optical path unit can pass through the optical path merging unit and be incident on the receiving unit at the same time.

[0018] Optionally, the first optical path unit and the second optical path unit have the same structure.

[0019] Optionally, when the control unit is not connected to the first optical path unit and the first optical path unit, the receiving unit includes a second beam splitting prism, a second reflector, a first photoelectric probe, a second photoelectric probe and a first recorder, the second beam splitting prism and the optical path merging unit are arranged at corresponding intervals so that the area to be measured is located between the second beam splitting prism and the optical path merging unit, the second beam splitting prism and the second reflector are arranged at intervals so that different light waves are separated by the second beam splitting prism and incident on the second reflector, the second beam splitting prism and the first photoelectric probe are arranged at corresponding intervals, the second reflector and the second photoelectric probe are arranged at corresponding intervals, the first photoelectric probe and the second photoelectric probe are respectively connected to the first recorder to simultaneously receive the ethanol content calculated under different light waves, and the first recorder is connected to the control unit.

[0020] The present invention also provides a laser real-time online detection method for drunk driving, the method comprising:

[0021] Alternately control the light output of the two laser beams emitted, so that the two laser beams alternately pass through the driver in the area to be detected, or simultaneously control the emission of the two laser beams, so that the two laser beams simultaneously pass through the driver in the area to be detected;

[0022] alternately or simultaneously receiving the power changes of the two laser beams and calculating the ethanol content in the two beams according to the power changes;

[0023] The calculated ethanol content is recorded and uploaded to the control terminal to provide a basis for law enforcement.

[0024] The laser real-time online drunk driving detection device of the present invention records the light intensity change alternately or simultaneously in the detection area by switching two optical paths, and calculates the ethanol content in the receiving unit according to the light intensity change. This process does not require various complex high-order frequency sweeping functions of the laser, simplifies the structure of the device, and reduces the cost. Since the ethanol data result is transmitted through only one receiving unit, the data transmission bandwidth resource requirement is reduced.

[0025] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of a laser real-time online drunk driving detection device according to an embodiment of the present invention is shown;

[0028] Figure 2 Another schematic diagram of the laser real-time online drunk driving detection device in the embodiment of the present invention is shown;

[0029] Figure 3 A schematic diagram of the process of a laser real-time online drunk driving detection method in an embodiment of the present invention is shown.

[0030] In the figure:

[0031] 5-first collimator, 7-first two-dimensional adjustment part, 9-first shutter, 11-first half-wave plate, 6-second collimator, 8-second two-dimensional adjustment part, 10-second shutter, 12-second half-wave plate, 15-first photoelectric probe, 16-first recorder, 13-first beam combining prism, 14-first reflector, 17-industrial computer, 2-shutter controller, 1-first laser, 3-first pigtail, 4-second pigtail, 18-second beam splitting prism, 19-second reflector, 20-second photoelectric probe. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1As shown, the present invention provides a laser real-time online detection device for drunk driving, including: a control unit, a laser unit, a first optical path unit, a first optical path unit, an optical path merging unit and a receiving unit, the control unit is connected to the laser unit to control the laser unit to turn on and off, when the first optical path unit is connected to the control unit to control the amount of light entering the optical path, the laser unit is connected to the first optical path unit to provide a first light source, the first optical path unit is connected to the control unit, so that the control unit controls the amount of light entering the optical path, the laser unit is connected to the first optical path unit to provide a first light source, the first optical path unit is connected to the control unit, so that the control unit controls the amount of light entering the optical path, the laser unit is connected to the first optical path unit to provide a first light source, the first optical path unit is connected to the first optical path unit The first optical path unit and the second optical path unit are arranged side by side, the outgoing light beams of the first optical path unit and the second optical path unit are alternately emitted from the optical path merging unit to the area to be measured, the receiving unit and the optical path merging unit are arranged at intervals, and the area to be measured is located between the optical path merging unit and the receiving unit, so that the receiving unit receives the power change of the detection light beam and calculates the ethanol content of the two optical paths in sequence; or when the control unit is not connected to the first optical path unit and the second optical path unit, so that the receiving unit simultaneously receives the power change of the detection light beam and calculates the ethanol content of the two optical paths at the same time, and the receiving unit is connected to the control unit to transmit the calculated ethanol content to the control unit to provide a basis for law enforcement. When the control unit is connected to the first optical path unit and the second optical path unit respectively, the light intensity change is recorded alternately by controlling the switching of the two optical paths, the light intensity change of the driver's exhaled ethanol in the area to be detected is recorded alternately, and the ethanol content is calculated in the receiving unit according to the light intensity change, or when the control unit is not connected to the first optical path unit and the second optical path unit, the light intensity change of the driver's exhaled ethanol in the area to be detected is recorded at the same time, and the ethanol content is calculated in the receiving unit according to the light intensity change of the two light beams. The above process does not require various complex high-order sweeping function requirements of the laser, simplifies the structure of the device, and thus reduces the cost. It should be noted that the present invention is based on the investigation of the spectral characteristics of ethanol vapor, and performs absorption spectrum detection in the spectrum band that can exclude most other types of gas crosstalk, avoiding the complicated algorithm design modeling of complex data; based on excluding most gas characteristic interference, the tunable laser function design is optimized, and the working characteristic absorption spectrum is determined by basic narrowband sweeping during equipment debugging and calibration, but no sweeping is performed during actual operation, therefore, the expensive sweeping-related components are optimized, that is, various complex high-order sweeping function requirements of the laser are not required, and the structure of the device is simplified. In addition, based on the limited diffusion rate of ethanol vapor in a relatively closed cab, different optical channels are scanned in time-sharing manner and share a characteristic spectrum receiving unit (sensor), which further reduces the cost of the entire device and reduces the data transmission bandwidth requirement of the device while meeting the measurement target requirements.The laser unit in the present invention can generate two different lasers, that is, the laser unit uses a dual-wavelength output laser, and the central wavelengths of the lasers are 1409.5nm and 1392.5nm, respectively. According to the 1392.5nm and 1409.5nm frequency points, a set of equations can be constructed to simultaneously solve the water vapor concentration and the ethanol concentration, and the ethanol concentration content can be detected, so as to determine whether it is drunk driving or drunk driving. That is, when a vehicle passes through the area to be detected, the laser beam generates light intensity fluctuations, which are recorded and calculated by the receiving unit to calculate the real-time changes in the ethanol vapor concentration, and the detection results are uploaded to the control unit of the traffic management (related database) to provide a basis for law enforcement.

[0034] In one embodiment, when the control unit is connected to the first optical path unit and the first optical path unit respectively, the first optical path unit includes a first collimator 5, a first two-dimensional adjustment member 7, a first shutter 9 and a first half-wave plate 11 which are arranged in sequence, and the control unit is connected to the first shutter 9 to control the amount of light entering so that the light beams emitted from the two optical paths can be alternately incident on the receiving unit through the optical path merging unit, the laser unit is connected to the first collimator 5, and the light of the first half-wave plate 11 is emitted to the optical path merging unit. It should be noted that the first two-dimensional adjustment member 7 can adjust the direction of the light beam incident thereon. If the light beam is tilted, the direction of the first two-dimensional adjustment member 7 is adjusted to keep the light beam path parallel. The first shutter 9 is controlled by the control unit so that the amount of light entering the first shutter 9 can be increased or decreased or even closed, so that the amount of light entering cannot pass through the first shutter 9. At this time, the shutter in the first optical path unit is opened, and another light beam passes through this shutter. Of course, the amount of light entering the shutter can also be adjusted, thereby realizing two fast light beams that can be alternately or sequentially received by the receiving unit. This method does not require various complex high-order frequency scanning function requirements of the laser, simplifies the structure of the device, and reduces the cost.

[0035] In one embodiment, the first optical path unit and the second optical path unit have the same structure. It should be noted that, since the first optical path unit and the first optical path unit have the same structure, the first optical path unit also includes a second collimator 6, a second two-dimensional adjustment member 8, a second shutter 10 and a second half-wave plate 12 which are arranged in sequence, the second collimator 6 is connected to the laser unit, and the light beam of the second half-wave plate 12 is emitted to the optical path merging unit. The functions and effects of the various components of the first optical path unit are the same as those of the various components of the first optical path unit, and will not be described here.

[0036] Further, the two shutters can use the model controller of GCI-73M, PF06-28 or #87-325, the specifications of the first collimator are to cover 1409nm, NA is not more than 0.16, and the divergence angle is not more than 0.5mrad, using GCX-LF15PC-1064, or NIR-CLM-W1409-1-FA, or Guangke 14028, and the specifications of the second collimator are to cover 1392.5nm, NA is not more than 0.16, and the divergence angle is not more than 0.5mrad, using GCX-LF15PC-1064 or NIR-CLM-W1392.5-1-FA or Guangke 140281. The specifications of the first two-dimensional adjustment part and the second two-dimensional adjustment part are the same, both of which have a clamping diameter of M12×0.5mm, and the models used are GCM-080235M, Hanguang NMM12.7, or POLARIS-K05S1. The aperture of both shutters is not less than 10mm, and the model is GCI-7103M-B, PF06-28 (aperture), or optoelectronic T-interface electric switch #11-153. The first half-wave plate passes the central wavelength of 1409nm, and the second half-wave plate passes the central wavelength of 1392.5nm. The models of the two half-wave plates need to be specially customized. The aperture of the reflector is not less than 10mm, and the model is GCC-102202, or optical instrument CM11-025A / U, or PF10-03-P01.

[0037] In one embodiment, when the control unit is connected to the first optical path unit and the first optical path unit respectively, the receiving unit includes a first photoelectric probe 15 and a first recorder 16 connected thereto, the optical path merging unit is connected to the first photoelectric probe 15, and the first recorder 16 is connected to the control unit. It should be noted that the first photoelectric probe 15 can receive the light beam that irradiates the person in the vehicle, and can calculate the light intensity fluctuation or power of the received light beam, and finally can calculate the real-time change of the ethanol vapor concentration, and can convert the optical signal into an electrical signal, and transmit the calculated ethanol vapor concentration in real time to the first recorder 16 for recording, and then transmit the recorded data to the control unit through the first recorder 16, so as to provide a basis for law enforcement for law enforcement personnel. The first photoelectric probe covers a wavelength of 1350-1450nm and a range of 50nW-40mW, and its model is S122C, or 818-IR / DB, or PD10-IR-PJ-C. The maximum sampling frequency of the first recorder 16 is not less than 100Hz, and its model is PM100D, or 843-R, or NOVAⅡ.

[0038] In one embodiment, the optical path merging unit includes a first beam-combining prism 13 and a first reflector 14 which are arranged at intervals. The first beam-combining prism 13 is arranged at intervals behind the first optical path unit to emit the first light source from the first beam-combining prism 13 to the area to be measured. The first reflector 14 is arranged at intervals behind the first optical path unit. The first light source is introduced into the first beam-combining prism 13 through the first reflector 14 to emit to the area to be measured through the first beam-combining prism 13. It should be noted that although the two light beams are finally combined into one and emitted from the first beam-combining prism 13, the two light beams can be emitted in different time periods by adjusting the corresponding shutters, and can be emitted alternately. This design method has a simpler structure. The covering wavelength of the beam-combining prism is 1350-1450nm, and the light-through diameter is not less than 10mm. Its model is GCC-402132, or PBS0012-1200-1500, or PBS054.

[0039] In one embodiment, the control unit includes an industrial computer 17 and a shutter controller 2 connected to each other, the industrial computer 17 is connected to the receiving unit and the laser unit respectively, and the shutter controller 2 is connected to the first optical path unit and the first optical path unit respectively. Optionally, the industrial computer 17 is used to control the operation of each component and receive the transmitted data, and the shutter controller 2 can control the amount of light entering the first shutter 9, that is, it can control the opening or closing of the first shutter 9. Of course, the specific execution command is issued to the first shutter 9 by the industrial computer 17, that is, it can control the operation of the laser unit.

[0040] In one embodiment, the laser unit includes a first laser 1, a first pigtail 3 and a second pigtail 4, one end of the first pigtail 3 is connected to the first optical path unit, one end of the second pigtail 4 is connected to the first optical path unit, and the first laser 1 is connected to the other ends of the first pigtail 3 and the second pigtail 4 respectively to generate two light waves. It should be noted that the laser unit is equipped with two central wavelength linear polarization lasers of 1409.5nm and 1392.5nm, which are connected to the corresponding optical paths through the first pigtail 3 and the second pigtail 4 respectively, and the output power of the optical fiber collimator is not less than 10mW and the diameter is not less than 80mm according to the characteristic size of the human mouth and nose width, and the laser beam is coaxially passed through the area to be measured through the PS polarization beam combiner (i.e., beam combining prism). Considering that the spatial distribution of human exhaled gas is generally relatively slow, the response of the optical power change of different channels can be recorded in time by controlling each shutter with the same sensor (i.e., receiving unit). In addition, when the whole device is tested at the factory, a silicone airbag with a valve storing ethanol vapor samples is used to release gas to simulate the process of drunk drivers exhaling alcohol-containing gas in the detection area. The calculation results of infrared measurement (i.e., the receiving unit) are compared with the concentration of the stored ethanol vapor samples to evaluate the accuracy of the measurement system. The first pigtail covers 1409nm, single longitudinal mode polarization-maintaining fiber, and its model is DH-FSM1064-APC-2, or LD-300-2300, or PMP1060, and the second pigtail covers 1392.5nm, single longitudinal mode polarization-maintaining fiber, and its model is DH-FSM1064-APC-2, or LD-300-2300, or PMP1060.

[0041] like Figure 2As shown, when the control unit is not connected to the first optical path unit and the first optical path unit, the first optical path unit includes a first collimator 5, a first two-dimensional adjustment member 7 and a first half-wave plate 11 which are arranged in sequence, the laser unit is connected to the first collimator 5, the first half-wave plate 11 is located after the optical path merging unit, and the light of the first half-wave plate 11 is emitted to the optical path merging unit, so that the light beams emitted from the first half-wave plate 11 and the first optical path unit can be incident on the receiving unit at the same time through the optical path merging unit. It should be noted that in order to measure the relatively rapid change of ethanol concentration, such as a motor vehicle in a galloping state, since there is no function to adjust the amount of light entering, the light beams of the two paths of light are simultaneously incident on the receiving unit through the optical path merging unit, and the receiving unit can receive the power change of the two paths of light beams and calculate it, and at the same time calculate the ethanol content. This process does not require various complex high-order frequency sweeping function requirements of the laser, simplifies the structure of the device, and thus reduces the cost. It should be noted that the present invention is based on a survey of the spectral characteristics of ethanol vapor, and performs absorption spectrum detection in a spectral band that can exclude most other types of gas crosstalk, thereby avoiding complicated algorithm design and modeling of complex data; based on eliminating most gas characteristic interference, the functional design of the tunable laser is optimized, and only the basic narrow-band frequency sweep is used to determine the working characteristic absorption spectrum during equipment debugging and calibration, while the frequency sweep is not performed during actual operation. Therefore, expensive frequency sweep-related components are optimized, that is, various complex high-order frequency sweep function requirements of the laser are not required, and the structure of the present device is simplified.

[0042] In one embodiment, the first optical path unit and the second optical path unit have the same structure. It should be noted that since the first optical path unit and the first optical path unit have the same structure, the first optical path unit also includes a second collimator 6, a second two-dimensional adjustment member 8, and a second half-wave plate 12 that are sequentially arranged at intervals. The second collimator 6 is connected to the laser unit, and the light beam of the second half-wave plate 12 is emitted to the optical path merging unit. The functions and effects of the various components of the first optical path unit are the same as those of the various components of the first optical path unit, and are not described here.

[0043] In one embodiment, when the control unit is not connected to the first optical path unit and the first optical path unit, the receiving unit includes a second beam splitting prism 18, a second reflector 19, a first photoelectric probe 15, a second photoelectric probe 20 and a first recorder 16. The second beam splitting prism 18 and the optical path merging unit are arranged at intervals so that the area to be measured is located between the second beam splitting prism 18 and the optical path merging unit. The second beam splitting prism 18 and the second reflector 19 are arranged at intervals so that different light waves are separated by the second beam splitting prism 18 and incident on the second reflector 19. The second beam splitting prism 18 and the first photoelectric probe 15 are arranged at intervals, the second reflector 19 and the second photoelectric probe 20 are arranged at intervals, the first photoelectric probe 15 and the second photoelectric probe 20 are respectively connected to the first recorder 16 to simultaneously receive the ethanol content calculated under different light waves, and the first recorder 16 is connected to the control unit. It should be noted that the second beam splitter prism 18 is arranged at intervals after the first optical path unit to receive the light source incident on the area to be measured, and the light source is emitted from the second beam splitter prism 18 to the second reflector 19 or the first photoelectric probe 15. Further, the two beams are finally merged into one, so that the two beams are emitted to the second beam splitter prism 18 in the receiving unit at the same time, and then the second beam splitter prism 18 separates the two different beams, one is incident on the first photoelectric probe 15 and the power change of this beam is calculated to obtain the ethanol content, and the data is transmitted to the first recorder 16 for recording, and the other is incident on the second reflector 19, and the second reflector 19 is incident on the second photoelectric probe 20 and the power change of this beam is calculated to obtain the ethanol content, and the data is transmitted to the first recorder 16 for recording, and all the recorded data are transmitted to the control unit through the first recorder 16 to provide a basis for law enforcement. This design method has a simpler structure. Optionally, the control unit is an industrial computer to coordinate the operation of the overall components. The laser unit is equipped with two central wavelength linear polarization first lasers 1 of 1409.5nm and 1392.5nm, which are connected to the corresponding optical paths through the first pigtail 3 and the second pigtail 4, respectively, and the output power of the optical fiber collimator is not less than 10mW and the diameter is not less than 80mm according to the characteristic size of the human mouth and nose width, and the laser beam is coaxially passed through the area to be measured through the PBS polarization beam combiner (i.e., beam combiner prism). The second beam splitter prism covers a wavelength of 1350-1450nm, and the light diameter is not less than 10mm. Its model is GCC-402132, or optical instrument PBS0012-1200-1500, or PBS054. The light diameter of the second reflector is not less than 10mm, and its model is GCC-102202, or optical instrument CM11-025A / U, or PF10-03-P01. The second photoelectric sensor covers a wavelength of 1350-1450nm and a range of 50nW-40mW. Its model is S122C, or 818-IR / DB, or PD10-IR-PJ-C.

[0044] It should be noted that the selection of various components in the present invention does not have a specific technical orientation, and general shelf products currently available in the market can meet the requirements.

[0045] like Figure 3 As shown, the present invention also provides a laser real-time online detection method for drunk driving, the method comprising:

[0046] Step S10, alternately controlling the light output of the two laser beams emitted, so that the two laser beams alternately pass through the driver in the area to be detected, or simultaneously controlling the emission of the two laser beams, so that the two laser beams simultaneously pass through the driver in the area to be detected;

[0047] Step S20, alternately or simultaneously receiving power changes of the two laser beams and calculating the ethanol content in the two beams according to the power changes;

[0048] Step S30, record the calculated ethanol content and upload it to the control end to provide a basis for law enforcement. Through the above steps, the two optical paths are alternately controlled to alternately record the light intensity changes or simultaneously record the light intensity changes of the driver's exhaled ethanol in the area to be detected, and the ethanol content is calculated in the receiving unit according to the light intensity changes. This process does not require various complex high-order sweep frequency function requirements of the laser, simplifies the structure of the device, and thus reduces the cost. Since the ethanol data results are transmitted only through one receiving unit, the data transmission bandwidth resource requirements are reduced.

[0049] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions 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.

Claims

1. A laser real-time online detection device for drunk driving, characterized in that: include: Control unit; A laser unit connected to the control unit so that the control unit controls the laser unit to turn on and off; A first optical path unit, when the first optical path unit is connected to the control unit, so that the control unit controls the amount of light entering the optical path, and the laser unit is connected to the first optical path unit to provide a first light source; A first optical path unit, when the first optical path unit is connected to the control unit so that the control unit controls the amount of light entering the optical path, the laser unit is connected to the first optical path unit to provide a first light source, and the first optical path unit is arranged side by side with the first optical path unit; An optical path merging unit, wherein the outgoing light beams of the first optical path unit and the second optical path unit are alternately emitted from the optical path merging unit to the area to be measured; A receiving unit is arranged at an interval with the optical path merging unit, and the area to be tested is located between the optical path merging unit and the receiving unit, so that the receiving unit receives the power change of the detection light beam to calculate the ethanol content of the two optical paths in sequence; Or when the control unit is not connected to the first optical path unit and the second optical path unit, so that the receiving unit simultaneously receives the power change of the detection light beam and calculates the ethanol content of the two optical paths at the same time, the receiving unit is connected to the control unit to transmit the calculated ethanol content to the control unit to provide a basis for law enforcement.

2. The laser real-time online drunk driving detection device according to claim 1 is characterized in that: When the control unit is connected to the first optical path unit and the second optical path unit respectively, the first optical path unit comprises a first collimator (5), a first two-dimensional adjustment member (7), a first shutter (9) and a first half-wave plate (11) which are arranged in sequence and spaced apart from each other; the control unit is connected to the first shutter (9) to control the amount of light entering so that the light beams emitted from the two optical paths can be alternately incident on the receiving unit through the optical path merging unit; the laser unit is connected to the first collimator (5), and the light from the first half-wave plate (11) is emitted to the optical path merging unit.

3. The laser real-time online drunk driving detection device according to claim 1 or 2, characterized in that: The first optical path unit and the second optical path unit have the same structure.

4. The laser real-time online drunk driving detection device according to claim 1 is characterized in that: When the control unit is connected to the first optical path unit and the first optical path unit respectively, the receiving unit includes a first photoelectric probe (15) and a first recorder (16) connected to each other, the optical path merging unit is connected to the first photoelectric probe (15), and the first recorder (16) is connected to the control unit.

5. The laser real-time online drunk driving detection device according to claim 1 is characterized in that: The optical path merging unit comprises a first beam-combining prism (13) and a first reflector (14) which are arranged at intervals. The first beam-combining prism (13) is arranged at intervals behind the first optical path unit so as to emit the first light source from the first beam-combining prism (13) to the area to be measured. The first reflector (14) is arranged at intervals behind the first optical path unit. The first light source is introduced into the first beam-combining prism (13) through the first reflector (14) so ​​as to emit to the area to be measured through the first beam-combining prism (13).

6. The laser real-time online drunk driving detection device according to claim 1 is characterized in that: The control unit comprises an industrial computer (17) and a shutter controller (2) connected to each other, the industrial computer (17) being connected to the receiving unit and the laser unit respectively, and the shutter controller (2) being connected to the first optical path unit and the first optical path unit respectively.

7. The laser real-time online drunk driving detection device according to claim 1 is characterized in that: The laser unit comprises a first laser (1), a first pigtail (3) and a second pigtail (4); one end of the first pigtail (3) is connected to the first optical path unit, one end of the second pigtail (4) is connected to the first optical path unit, and the first laser (1) is respectively connected to the other ends of the first pigtail (3) and the second pigtail (4) to generate two light waves.

8. The laser real-time online drunk driving detection device according to claim 1 is characterized in that: When the control unit is not connected to the first optical path unit and the first optical path unit, the first optical path unit comprises a first collimator (5), a first two-dimensional adjustment member (7) and a first half-wave plate (11) which are arranged in sequence and spaced apart from each other, the laser unit is connected to the first collimator (5), the first half-wave plate (11) is located after the optical path merging unit, and the light of the first half-wave plate (11) is emitted to the optical path merging unit, so that the light beams emitted from the first half-wave plate (11) and the first optical path unit can pass through the optical path merging unit and simultaneously be incident on the receiving unit.

9. The laser real-time online drunk driving detection device according to claim 8 is characterized in that: The first optical path unit and the second optical path unit have the same structure.

10. The laser real-time online drunk driving detection device according to claim 8, characterized in that: When the control unit is not connected to the first optical path unit and the first optical path unit, the receiving unit comprises a second beam splitting prism (18), a second reflector (19), a first photoelectric probe (15), a second photoelectric probe (20) and a first recorder (16); the second beam splitting prism (18) and the optical path merging unit are arranged at intervals so that the area to be measured is located between the second beam splitting prism (18) and the optical path merging unit; the second beam splitting prism (18) and the second reflector (19) are arranged at intervals so that different light waves are separated by the second beam splitting prism (18) and incident on the second reflector (19); the second beam splitting prism (18) and the first photoelectric probe (15) are arranged at intervals so that the second reflector (19) and the second photoelectric probe (20) are arranged at intervals so that the first photoelectric probe (15) and the second photoelectric probe (20) are respectively connected to the first recorder (16) to simultaneously receive the ethanol content calculated under different light waves; and the first recorder (16) is connected to the control unit.

11. A laser real-time online detection method for drunk driving, characterized in that: The method comprises: Alternately control the light output of the two laser beams emitted, so that the two laser beams alternately pass through the driver in the area to be detected, or simultaneously control the emission of the two laser beams, so that the two laser beams simultaneously pass through the driver in the area to be detected; alternately or simultaneously receiving the power changes of the two laser beams and calculating the ethanol content in the two beams according to the power changes; The calculated ethanol content is recorded and uploaded to the control terminal to provide a basis for law enforcement.

Images