Device and method for quantitatively analyzing mine environment gas based on terahertz time-domain spectroscopy system

Abstract

The invention discloses a device and a method for quantitatively analyzing mine environment gas based on a terahertz time-domain spectroscopy system. The device comprises a femtosecond laser, a beam splitter, an optical delay device, a reflecting mirror, a polarizer, a focusing lens, a terahertz emitter, a gas sampling tank, indium tin oxide conductive glass, a zinc telluride electro-optical crystal, a high-power amplifier, a data acquiring and processing system, a quarter-wave plate, a Wollaston prism, a balance detector, a phase-locked amplifier and a computer. The method for quantitatively analyzing the mine environment gas, provided by the invention, comprises the following steps: firstly, establishing a quantitative analysis model of the mine environment gas; secondly, acquiring a terahertz spectrum of gas to be measured through the device provided by the invention; thirdly, determining the content of each component in the mine environment gas by using the established quantitative analysis model. The method has the characteristics of simple structure, operability, high analysis speed, high accuracy and the like. The method provided by the invention can be applied to mixture analysis in other fields.

Description

technical field [0001] The invention belongs to the application field of terahertz technology, and in particular relates to a mine environment gas concentration measurement and analysis device and method based on a terahertz time-domain spectroscopy system, which can quantitatively analyze the mine environment gas. Background technique [0002] Mine environmental gas detection is an effective guarantee to ensure the safe operation of mine personnel and improve mine disaster prevention and resistance capabilities. Harmful and toxic gases in mines mainly include methane (CH4, also known as gas), carbon monoxide (CO), carbon dioxide (CO2), hydrogen sulfide (H2S) and so on. Among them, methane itself is non-toxic, but when the concentration is high, it will cause suffocation and does not support combustion, but it will cause an explosion when it has a certain concentration in the air and encounters high temperature; carbon monoxide is a poisonous substance harmful to blood and n...

AI Technical Summary

Problems solved by technology

The accuracy of the contact combustion method and semiconductor absorption method is easily interfered by other gases; the catalytic method is easily poisoned, which seriously affects the accuracy of detection; the infrared absorption method is mainly based on the different absorption of different functional groups by infrared radiation for gas detection, and can only measure low concentrations Gas is easily corroded by high-concentration gas and sulfide. After a period of use, the zero point will drift and the sensitivity will decrease. Therefore, standard gas must be used to calibrate the zero point and sensitivity at regular intervals; gas chromatography is based on the chromatographic column. The distribution and adsorption coefficient between the gas phase and the stationary phase are different to separate the measured gas, and then use the detector for detection. This method takes a long time to detect, and often cannot directly give the composition information of the measured gas, and needs to be combined with other methods. for further analysis

The analysis found that there are many methods for the analysis of ambient gas in mines, but they all have many limitations, and it is difficult to meet the requirements of fast, intelligent and reliable detection of ambient gases in mines. The detection of ambient gases in mines has not been well solved so far.

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