Alcohol concentration telemetering device

Abstract

The present invention provides an alcohol concentration telemetering device. In the alcohol concentration telemetering device, under the control of a control module, a detection beam emitted by a detection laser sequentially sweeps through three target detection waves and then is split into two beams (a detection beam and a reference beam) by a beam splitting device. The detection beam passes through an optical collector and a gas environment to be tested, is reflected at a reflecting device, passes through the gas environment to be tested once again, is reflected by the optical collector to adetection detector after passing through the gas environment to be tested, and is photoelectrically converted by the detection detector to obtain a detecting signal. The reference beam is transmittedto a reference detector and is photoelectrically converted by the reference detector to obtain a reference signal. A data processing module is used for collecting the detecting signal and the reference signal including the three target detection wavelengths and calculating the alcohol concentration in the gas environment to be tested. According to the present invention, the cross-absorption interference of alcohol and water vapor is eliminated, and the accuracy of simultaneous detection of alcohol gas and water vapor is improved.

Description

technical field [0001] The disclosure relates to the technical field of photoelectric detection, in particular to an alcohol concentration remote measurement device. Background technique [0002] Alcohol gas concentration telemetry is of great significance for road supervision departments to improve the capture efficiency of drunk drivers in the process of road law enforcement, reduce road traffic safety hazards and monitor the drinking situation of people entering alcohol-free workplaces. At present, the remote measurement of alcohol concentration is mainly realized by the method of optical absorption detection. The commonly used methods mainly include Fourier Transform Infrared Spectrometry (FTIR for short) and Differential Absorption Laser (DIAL for short). Tunable Diode Laser Absorption Spectroscopy (TDLAS for short). However, in the actual detection application of alcohol concentration telemetry, environmental factors that cannot be predicted in advance, such as teleme...

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Problems solved by technology

However, this system often requires the use of multiple lasers and detectors, involving optical multi-dimensional demodulation systems or complex detection algorithms, and often requires high implementation costs.

Moreover, according to the existing reports, the wavelength interval of lasers used in this system is often relatively large, and the background transmittance of different wavelengths in the test space shows a nonlinear change with the increase of wavelength. With the increase of detection distance, the transmittance between different wavelengths The rate difference will also increase, so it will introduce measurement error and even produce erroneous detection results

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