Distributed optical fiber methane monitoring system based on TDLAS (tunable diode laser absorption spectroscopy)

Abstract

The invention discloses a distributed optical fiber methane monitoring system based on TDLAS (tunable diode laser absorption spectroscopy). The system comprises a detection mainframe, a transmission layer and a plurality of detection terminals, wherein the detection mainframe is positioned above a well, belongs to the core of the whole monitoring system, and is used for producing detection laser, summarizing and displaying detection data and controlling the detection terminals; the detection terminals are positioned below the well, and used for persistently and uninterruptedly detecting the methane gas concentration, supporting mutual sharing with the detection mainframe and adjusting the operating mode according to the requirements of the detection mainframe; the transmission layer is used for the data interaction between the detection mainframe above the well and the detection terminals below the well, and used for detecting the transmission operation of the laser. The system has high precision, small zero shift, good stability, good selectivity and a long service life, and can be automatically corrected. The system has good practical value and a wide application prospect in the technical fields of photoelectricity data management and security inspection equipment.

Description

technical field [0001] The invention relates to a distributed optical fiber methane monitoring system based on TDLAS (Tunable Semiconductor Laser Absorption Spectroscopy), which belongs to the technical fields of optoelectronics, data management and security inspection equipment. Background technique [0002] Methane is a flammable and explosive gas, and is the main component of mine gas and various liquid fuels (50-97% of natural gas is methane). Among coal mine safety accidents in my country, gas accidents have accounted for more than 80% of the total number of coal mine accidents, and gas explosions have accounted for more than 50% of all major accident casualties. A gas explosion needs to meet three conditions at the same time, that is, the oxygen concentration in the mine is above 12%, the methane concentration is within the range of 5-15%, and there is an open flame. At the same time, methane is also considered to be one of the main gases of the greenhouse effect, and...

AI Technical Summary

Problems solved by technology

But this kind of sensor also has many disadvantages: the selectivity of the sensitive body to gas is poor; the complex nonlinear relationship between input and output is not conducive to data processing; the stability is poor, and there is a problem of temperature adaptability

Therefore, this method is difficult to achieve online detection, and the real-time performance is poor

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