Carbon monoxide and methane integral optical fiber sensing measuring system

Abstract

This is an integral optical fiber sensor and testing system using for the carbon monoxide and methane. It composes of first DFB laser source, second DFB laser source, first waveform generator, second waveform generator, first wavelength select modulator, second wavelength select modulator, optical fiber coupling implement, sensor detection head, photoelectric conversion module, signal modulate data collection module and microprocessor. The first waveform generator acts on first wavelength select modulator, the latter controls the first DFB laser source and it connects with one import ending of coupling implement by optical fiber. The second waveform generator acts on second wavelength select modulator, the latter controls the second DFB laser source and it connects with another import ending of coupling implement by optical fiber. The fan-out of coupling implement connects with sensor detection head and the latter connects with photoelectric conversion module. The photoelectric conversion module connects with signal modulate and data collection module by lead and the latter connects with microprocessor by lead. The microprocessor controls the first wavelength selecting and modulator, second wavelength selecting and modulator and display modulator.

Description

technical field [0001] The invention relates to the field of gas detection by optical means, and specifically belongs to a system for simultaneously measuring the concentration of multiple gases by using gas absorption spectrum detection technology. Background technique [0002] Gas sensing technology plays an extremely important role in environmental monitoring, industrial gas process control and mine safety. Research on safe, reliable and highly sensitive harmful gas sensing technology has great scientific, social and economic significance. The detection of gas type and concentration can be divided into: optical type, semiconductor type, solid electrolyte type, contact combustion type, electrochemical type, etc. according to the detection principle. Among them, the optical gas sensor has many advantages that other sensors cannot match, such as high sensitivity, fast response speed, large dynamic range, anti-electromagnetic interference, flame-proof and explosion-proof, and...

AI Technical Summary

Problems solved by technology

However, the existing underground detection methods for harmful gases are still relatively backward

First of all, the existing underground gas detection uses carbon monoxide sensor and methane sensor to measure separately, which has not realized the integrated sensing and measurement of multiple gases, and needs to install more sensors and cables, which is not conducive to adjustment and debugging; secondly, the existing Most of the sensors are based on the principle of catalytic combustion or electrochemical sensing, with short life, low precision, poor stability, difficult adjustment, and often have false detection and false positives.

Mismeasurement and false reporting of the concentration of harmful gases in coal mines will send fatal wrong information to people, posing a great threat to the safety of mines and personnel

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