A single light source laser drive system for reflective laser drunk driving detection
A laser-driven, reflective technology, used in color/spectral property measurement, measurement devices, material analysis by optical means, etc., can solve problems such as high cost and complex system, and achieve reduced system cost, complexity, and improvement. The effect of detection accuracy
Active Publication Date: 2019-10-25
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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However, the laser drive system with two laser light sources has the problems of complex system and high cost
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[0027] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.
[0028] The single-light source laser driving system for radiant laser drunk driving detection disclosed in the present application generates three-segment composite scanning waves of rising current section, falling current section and constant current section. As a driving signal of a laser, the detection is continuously converted over time. The laser beam and the reference laser beam complete the detection of ethanol gas, which reduces the complex...
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This application discloses a single light source laser drive system for reflective laser drunk driving detection. The signal modulator modulates the output signals of the scanning wave signal generator and the sine wave signal generator to obtain a three-segment composite scanning wave as a laser. The driving signal, the output wavelength of the laser driven by the constant current segment of the three-segment composite scanning wave is in the non-absorption region of ethanol gas. Through the detection results of this segment, the noise interference generated by the environment can be eliminated by comparison. The laser is combined in the three-segment The output wavelength of the rising current section and the falling current section of the scanning wave includes the central wavelength absorbed by ethanol gas, which is used to detect the concentration of ethanol gas, and through the driving of the rising current section and the falling current section, symmetrical scanning is realized to eliminate detection The process passes through symmetrical disturbances due to the scanning characteristics. Therefore, the driving of a laser light source is realized, the complexity of the system is reduced, the cost of the system is reduced, and the detection accuracy is improved.
Description
Technical field [0001] This application relates to the field of photoelectric detection technology, and specifically to a single-light source laser driving system for reflective laser drunk driving detection. Background technique [0002] With the gradual improvement of social living standards and the increasing number of motor vehicles, people’s lives and property safety are seriously endangered by drunk driving. At present, the detection and investigation of drunk driving behavior mainly uses traditional breathing alcohol detectors. When drivers are checked for drunk driving, vehicles need to be parked, which not only affects traffic, but also has low efficiency and high labor costs. [0003] The fast drunk driving detection system using TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology can realize drunk driving detection for the driver while the vehicle is driving. The theoretical basis of TDLAS technology is Beer Lambert’s absorption law. After the laser passes th...
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IPC IPC(8): G01N21/39G01N21/01
CPCG01N21/01G01N21/39G01N2021/396
Inventor 王彪阮慧房思超郭少艾
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI