Infrared methane measuring device and measuring method capable of realizing accurate positioning

Abstract

The invention discloses an infrared methane measuring device and measuring method capable of realizing accurate positioning. The measuring device comprises a main controller, a distributed feedback laser, a telescopic structure, a baffle, an explosion-proof casing and a system power supply. The main controller is connected with a modulation signal generating circuit, a laser temperature control circuit, a first wireless communication module and a display device respectively through serial ports. A laser diode, an NTC thermistor, a semiconductor cooler and a photodiode are packaged in the distributed feedback laser; the laser diode is connected to the modulation signal generating circuit; and the NTC thermistor and the semiconductor cooler are connected to the laser temperature control circuit respectively. A photoelectric conversion circuit, a harmonic detection circuit, a co-controller and a second wireless communication module are arranged in the baffle successively; the co-controller is connected with the photoelectric conversion circuit, the harmonic detection circuit and the second wireless communication module respectively through serial ports; and the photoelectric conversion circuit and the harmonic detection circuit are connected.

Description

technical field [0001] The invention relates to the field of gas detection and analysis, in particular to an infrared methane measuring device and a measuring method capable of precise positioning. Background technique [0002] With the rapid development of industries such as oil, natural gas, and coal mines, and the gradual increase in the proportion of natural gas in my country's energy consumption structure, casualties caused by natural gas mining, transportation, and use are also increasing. The main component of natural gas is methane, commonly known as gas. When the methane content in the air reaches 25%-30%, it will cause adverse reactions such as headache, dizziness, fatigue, rapid breathing and heartbeat. When the concentration of methane is between 5% and 16%, it will explode when encountering an open flame. According to statistics, 40% of mine disasters in my country are caused by gas explosions, and the number of deaths caused by gas explosions accounts for 70% ...

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used gas detection methods include catalytic combustion method, semiconductor gas sensing method, thermal conductivity effect method, infrared absorption spectrometry and gas chromatography, etc., first explain their shortcomings: catalytic combustion method is greatly affected by the environment , Factors such as temperature and humidity will cause zero point drift, and the actual operation in the mine is more difficult. In addition, the sensor itself may become a source of explosion, which has potential safety hazards, and the components will also produce "poisoning" and cannot be used; semiconductor gas sensing method It needs to be doped with noble metals Pd and Pt to improve the detection sensitivity, which will cause adverse effects such as high working temperature, poor stability and consistency, and is difficult to apply in practice; the thermal conductivity method is mainly used for the detection of gas purity, and there is a detection sensitivity Low, large detection error, large temperature drift and other shortcomings, not suitable for real-time detection of methane concentration; infrared absorption spectroscopy has the advantages of high precision, good selectivity, no zero drift and poisoning, and is the main research of domestic gas detection At present, many foreign companies have successfully developed detection equipment based on the principle of infrared absorption spectroscopy for underground gas detection in mines, but similar products have not been developed in China; gas chromatography has a fast separation speed and a wide range of measurement. Methane can achieve high sensitivity, but the instrument is bulky and inconvenient to move, making it difficult to achieve real-time and online detection

Images