Search

CN-122016718-A - Non-stop drunk driving detection system and method integrating laser absorption spectrum and laser Raman spectrum

CN122016718ACN 122016718 ACN122016718 ACN 122016718ACN-122016718-A

Abstract

The application provides a system and a method for detecting drunk driving without stopping by combining a laser absorption spectrum and a laser Raman spectrum. The device comprises a dual-mode laser emitting unit, an optical transmission unit and a signal receiving and processing unit. In the transmitting unit, the signal generator generates a superposition modulation signal of sawtooth wave and sine wave to drive the first laser to output modulated laser for absorption spectrum analysis, the second laser to output laser for exciting Raman scattering, and the mode switching controller supports synchronous operation of absorption mode, raman mode or dual mode. The optical transmission unit directs the laser light to the vehicle cabin and collects the return optical signal. The receiving processing unit demodulates the absorption signal through the lock-in amplifier to obtain harmonic waves, analyzes the Raman scattering signal through the spectrometer to obtain characteristic peaks, further calculates alcohol concentration, and achieves rapid and reliable non-contact detection.

Inventors

  • YE WEI
  • LIANG JUN

Assignees

  • 南京莱通中电子科技有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (10)

  1. 1. The non-stop drunk driving detection system integrating the laser absorption spectrum and the laser Raman spectrum is characterized by comprising a dual-mode laser emission unit arranged on one side of a road, a signal receiving and processing unit arranged on the other side of the road and light transmission units arranged on two sides of the road; The dual-mode laser emission unit comprises a signal generator, a laser driver, a first laser, a second laser and a mode switching controller, wherein the signal generator generates a modulation signal, the modulation signal comprises a superposition signal of a sawtooth wave and a sine wave, the laser driver drives the first laser to output a modulation laser signal based on the modulation signal, the second laser outputs continuous or pulse laser used for exciting Raman scattering, and the mode switching controller is used for selecting a first laser mode, a second laser mode or a dual-laser synchronous mode; The light transmission unit comprises a first light component arranged on one side of a road and a second light component arranged on the other side of the road, wherein the first light component is used for converting laser output by a first laser or a second laser into parallel light and emitting the parallel light to a vehicle cabin; The signal receiving and processing unit comprises a first photoelectric detector, a phase-locked amplifier, a second photoelectric detector, a spectrometer and a gas concentration calculating unit, wherein the first photoelectric detector is used for receiving transmission/absorption optical signals converged by a second optical component and converting the transmission/absorption optical signals into first electric signals, the phase-locked amplifier is used for demodulating the first electric signals by taking sine waves as reference signals to obtain harmonic signals, the second photoelectric detector is used for receiving Raman scattering optical signals collected by the second optical component and converting the Raman scattering optical signals into second electric signals, the spectrometer is used for analyzing Raman displacement characteristic peaks of the second electric signals, and the gas concentration calculating unit is used for calculating alcohol gas concentration in a vehicle cabin based on the harmonic signals and/or the Raman displacement characteristic peaks.
  2. 2. The drunk driving detection system without stopping according to claim 1, wherein the central wavelength of the modulated laser signal output by the first laser is 3345 nanometers, the modulated laser signal is positioned at the center of an alcohol gas absorption peak and avoids a shielding wavelength range of a vehicle sunshade film, and the laser wavelength output by the second laser is visible light or near infrared wave band and is suitable for exciting Raman characteristic displacement of ethanol molecules.
  3. 3. The no-stop drunk driving detection system according to claim 1, wherein the gas concentration calculating unit calculates the alcohol gas concentration based on the harmonic signal in the first laser mode in the following manner: ; Wherein, the For the amplitude of the first harmonic, For the second harmonic amplitude, k is the calibration coefficient, Is the absorption coefficient, L is the optical path; and calculating the concentration of the alcohol gas based on the Raman characteristic peak intensity and a preset calibration curve in the second laser mode.
  4. 4. The no-stop drunk driving detection system according to claim 1, wherein the mode switching controller automatically switches the detection mode according to the ambient light intensity, the light transmittance detection result of the sunshade film of the vehicle or the preliminary screening concentration threshold value, or receives an external instruction to perform manual switching.
  5. 5. The drunk driving detection system without stopping according to claim 1, further comprising an environment parameter sensor and a signal fusion processing module, wherein the environment parameter sensor is used for detecting environment temperature and humidity, illumination intensity and vehicle speed, and the signal fusion processing module is used for carrying out weighted fusion on harmonic signals and Raman signals by combining environment parameters and outputting a final alcohol concentration judging result.
  6. 6. The method for detecting drunk driving without stopping by combining laser absorption spectrum and laser Raman spectrum is based on the system of any one of claims 1-5, and is characterized by comprising the following steps: step S1, selecting a working mode according to detection conditions, and controlling a dual-mode laser emission unit to emit corresponding laser; S2, converting laser into parallel light by the first optical component and directing the parallel light to a vehicle cabin in running; S3, collecting optical signals passing through or scattered from a vehicle cabin by the second optical component, and converging the optical signals to the signal receiving and processing unit; Step S4, the signal receiving processing unit performs separation processing on the optical signal: if the mode is an absorption spectrum mode, processing the harmonic signal by a first photoelectric detector and a lock-in amplifier; if the mode is a Raman spectrum mode, a Raman shift spectrum is obtained by processing the second photoelectric detector and the spectrometer; step S5, the gas concentration calculating unit calculates the concentration of the alcohol gas based on the harmonic signal or the Raman spectrum; and S6, outputting a detection result, and carrying out dual-mode result comparison or fusion judgment according to the requirement.
  7. 7. The method of claim 6, wherein in the dual laser synchronization mode, the absorption spectrum signal and the raman scattering signal are synchronously collected, and data fusion is performed through the signal fusion processing module, so that the detection confidence is improved.
  8. 8. The method of claim 6, further comprising the step of dynamically adjusting the laser power and integration time based on vehicle speed to adapt to signal acquisition requirements at different vehicle speeds.
  9. 9. The method of claim 6, wherein if the absorption spectrum pattern detects that the alcohol concentration exceeds a predetermined threshold, the raman spectrum pattern is automatically triggered for a second verification to eliminate false positives.
  10. 10. The method of claim 6, wherein the detection results are uploaded to the traffic management platform in real time and associated with vehicle information to support drunk driving behavior traceability and statistics.

Description

Non-stop drunk driving detection system and method integrating laser absorption spectrum and laser Raman spectrum Technical Field The invention relates to the technical field of information, in particular to a drunk driving detection system and method without stopping a vehicle by integrating a laser absorption spectrum and a laser Raman spectrum. Background Traditional drunk driving detection relies on traffic police to intercept and use an expiration alcohol detector on site, and a driver is required to stop and cooperate, so that traffic jam and traffic efficiency reduction are easy to cause. In recent years, non-stop detection technology based on laser absorption spectrum is gradually developed, and the concentration is inverted by detecting the absorption degree of alcohol gas in a vehicle cabin to laser with specific wavelength, so that the non-stop detection is realized, and the problems of window film sticking, ambient light interference, moisture cross sensitivity and the like still exist. The laser Raman spectrum technology is based on molecular vibration scattering, has the advantages of no need of sample pretreatment, matrix interference resistance, qualitative identification and the like, and is particularly suitable for complex gas mixed systems, but has high equipment cost, large fluorescence interference and limited low concentration sensitivity. In order to overcome the limitation of a single technology and improve the reliability, adaptability and accuracy of drunk driving detection, a fusion system integrating multiple optical detection principles is needed to realize quick and double verification detection of alcohol gas. Disclosure of Invention The invention aims to provide a non-stop drunk driving detection system and method integrating a laser absorption spectrum and a laser Raman spectrum, which realize quick, reliable and non-contact detection of alcohol gas in a running vehicle and improve screening accuracy and environmental adaptability by integrating high-sensitivity detection of the laser absorption spectrum and qualitative identification capability of the laser Raman spectrum. The invention provides a non-stop drunk driving detection system integrating a laser absorption spectrum and a laser Raman spectrum, which mainly comprises the following components: The system comprises a dual-mode laser emission unit arranged on one side of a road, a signal receiving and processing unit arranged on the other side of the road, and light transmission units arranged on two sides of the road; The dual-mode laser emission unit comprises a signal generator, a laser driver, a first laser, a second laser and a mode switching controller, wherein the signal generator generates a modulation signal, the modulation signal comprises a superposition signal of a sawtooth wave and a sine wave, the laser driver drives the first laser to output a modulation laser signal based on the modulation signal, the second laser outputs continuous or pulse laser used for exciting Raman scattering, and the mode switching controller is used for selecting a first laser mode, a second laser mode or a dual-laser synchronous mode; The light transmission unit comprises a first light component arranged on one side of a road and a second light component arranged on the other side of the road, wherein the first light component is used for converting laser output by a first laser or a second laser into parallel light and emitting the parallel light to a vehicle cabin; The signal receiving and processing unit comprises a first photoelectric detector, a phase-locked amplifier, a second photoelectric detector, a spectrometer and a gas concentration calculating unit, wherein the first photoelectric detector is used for receiving transmission/absorption optical signals converged by a second optical component and converting the transmission/absorption optical signals into first electric signals, the phase-locked amplifier is used for demodulating the first electric signals by taking sine waves as reference signals to obtain harmonic signals, the second photoelectric detector is used for receiving Raman scattering optical signals collected by the second optical component and converting the Raman scattering optical signals into second electric signals, the spectrometer is used for analyzing Raman displacement characteristic peaks of the second electric signals, and the gas concentration calculating unit is used for calculating alcohol gas concentration in a vehicle cabin based on the harmonic signals and/or the Raman displacement characteristic peaks. Further, the central wavelength of the modulated laser signal output by the first laser is 3345 nanometers, the modulated laser signal is positioned at the center of an alcohol gas absorption peak and avoids the shielding wavelength range of a vehicle sunshade film, and the laser wavelength output by the second laser is visible light or near infrared band, so that the modulated laser sig