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TDLAS-based detection device and method of trace CO gas concentration

A gas concentration and detection device technology, applied in color/spectral characteristic measurement, analysis materials, instruments, etc., can solve problems such as low reliability of measurement results, deviation of measured CO gas concentration values, etc., to avoid personnel poisoning and death accidents, cost Low, simple structure effect

Active Publication Date: 2017-09-08
XIAN UNIV OF SCI & TECH +1
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Problems solved by technology

[0005] In order to solve the problems of deviation in CO gas concentration measurement and low reliability of measurement results in the prior art, the present invention provides a detection device and method based on TDLAS trace CO gas concentration that accurately detects the concentration and improves detection reliability.

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Embodiment Construction

[0035] The invention provides an on-line detection device and detection method based on the TDLAS trace CO concentration gas, which performs real-time temperature and pressure correction on the detected gas concentration. First, the wavelength modulation technology is used to lock the wavelength emitted by the laser near the CO absorption peak. Finally, the computer displays the CO gas concentration value to be measured. In order to accurately detect the concentration, the present invention adds a system correction function.

[0036] Such as figure 1The detection system based on TDLAS trace CO gas concentration includes a function signal generator 1, a DFB laser 2, a collimator 4, a flow meter 5, an air pump 6, a Herriott absorption cell 7, a temperature sensor 8, a pressure sensor 9, Focusing lens 10, photodetector 11, preamplifier 12, digital lock-in amplifier 13, microprocessor 14 and computer 15; The output end of function signal generator 1 is connected with DFB laser 2 a...

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Abstract

The invention provides a TDLAS-based detection device and method of trace CO gas concentration, and solves the problems of deviation of the measured CO gas concentration value and low reliability of measurement results in the prior art. The detection device comprises a function signal generator, a laser device, a collimator, a flowmeter, an air pump, a herriott absorption cell, a temperature sensor, a pressure sensor, a focusing lens, a photoelectric detector, a preamplifier, a digital lock-in amplifier, a microprocessor and a computer, wherein a correcting module is arranged in the microprocessor, and the correcting module is used for correcting the detected gas concentration value. The detection device and method are mainly used for real-time automatic monitoring of trace CO gas, and can effectively avoid the occurrence of death accidents of personnel by poisoning of CO gas.

Description

technical field [0001] The invention relates to the field of gas concentration detection, in particular to a TDLAS-based device and method for detecting the concentration of CO gas. Background technique [0002] CO gas is a colorless, odorless, poisonous gas, trace CO is the atmospheric concentration of less than 10 -6 gas. The level of CO concentration is one of the important signs of chemical and coal mine disasters, and it is also an important cause of personnel poisoning and death. Therefore, it is very important to accurately detect the CO concentration. [0003] There are roughly two methods for detecting gases. One is the traditional gas detection method, and the other is the optical detection method. Traditional gas detection methods include chemical analysis and chromatography. Chemical analysis can only conduct preliminary qualitative and quantitative analysis in the laboratory or on site. The operating level of analysts directly affects the accuracy of measure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39G01N2201/1218G01N2201/1211Y02A50/20
Inventor 邓军王伟峰殷聪杜京义马砺张保龙陈炜乐
Owner XIAN UNIV OF SCI & TECH
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