Portable and non-contact laser alcohol measurement device and method

Abstract

The invention relates to a portable and non-contact laser alcohol measurement device and method. The device comprises a DSP processing circuit, a TDLAS driving and modulating circuit, a semiconductor laser unit, an optical system, a photoelectric detector, a low-noise pre-amplification circuit, an ultra-weak signal extracting circuit and an instrument setting input and data output display screen. The measurement method of the measurement device specifically comprises the following steps that 1, a calibration curve is fit; 2, measurement parameters are input; 3, emergent laser is excited and transmitted; 4, a return light signal is received; 5, the molecular concentration of vehicle alcohol gas to be measured is measured; 6, the molecular concentration of the alcohol gas is displayed and an alarm is given. By adopting the device and method, quick and accurate measurement of the alcohol gas contents in passing vehicles on roads is achieved.

Description

technical field [0001] The invention belongs to the field of photoelectric detection, and relates to a portable non-contact laser alcohol measuring device and method. Background technique [0002] my country is the country with the largest population in the world, and also the country with the largest number of drinkers, so our country belongs to the country where drunk driving accidents occur frequently. According to statistics, the probability of traffic accidents caused by drunk driving in my country is 27 times that of non-drunk driving, and one person will die in every three drunk driving traffic accidents. The number of deaths caused by drunk driving in my country has been two consecutive years Ranked first in the world for ten years. Therefore, my country's traffic law enforcement department has never relaxed the inspection of drunk driving (drunk driving and drunk driving). However, with the rapid development of my country's economy, the number of vehicles purchased...

AI Technical Summary

Problems solved by technology

[0004] 1. Fuel cell wine testing equipment belongs to electrochemical reaction. Although this type of product is small and easy to carry, it has serious time drift and temperature drift and needs regular calibration;

[0005] 2. The semiconductor type alcohol detection equipment belongs to physical reaction. Compared with the fuel cell type, the sensitivity of this type of product is higher, but it needs to be preheated when used, the power consumption is large, the stability is poor, and the general working life is less than 2 years;

[0006] 3. The colorimetric detection instrument is a chemical reaction, and the operation is relatively simple, but this type of product is easily affected by formaldehyde, methanol and other substances, and the detection accuracy is not high

[0009] Both require traffic police law enforcement personnel to stop the vehicle, and then the driver needs to cooperate with the mouth to blow air on the detection instrument to complete the inspection, so the detection efficiency is relatively low

[0010] (2) Cause road congestion

[0011] During the inspection, if every passing vehicle is inspected, it may cause serious road congestion; if the traffic police law enforcement officers conduct random random inspections of passing vehicles, there is a possibility of missing inspections

[0012] (3) Hidden health and safety hazards

[0013] In actual use, the driver needs to point his mouth at the detection instrument for blowing inspection. If the air intake nozzle is not replaced in time, there will be health and safety hazards

Images