Gas concentration monitoring system for coal mine

Abstract

The invention particularly relates to a gas concentration monitoring system for a coal mine. The gas concentration monitoring system comprises a gas concentration sensor, a single-ended rotary differential module, a first-grade program-control amplification module, a program-control lowpass filtering module, a second-grade amplification module, an A / D conversion module, a central processor, a displaying module, an alarming module and a power source module. Through the single-ended rotary differential module, single-ended input is converted into differential output, interference inhibiting is facilitated, the quality of signals is improved, the signal-to-noise ratio of the signals is increased, thus gas concentration detection is more accurate, through the first-grade program-control amplification module, it is achieved that the amplification times of the signals are adjustable, so that the signal inputting range is enlarged, the universality of the system is improved, the program-control lowpass filtering module inhibits high-frequency noise in the signal to increase the signal-to-noise ratio of the signals, signal restoration by the rear end is facilitated, through the second-grade amplification module, the gain of the whole system can be increased, the input need of the A / D conversion module is satisfied so that the system can process input of signals with an ultra-low amplitude value, and thus the sensitivity of the system is improved.

Description

technical field [0001] The invention relates to the technical field of gas monitoring for coal mines, in particular to a gas concentration monitoring system for coal mines. Background technique [0002] Mine gas is a colorless, tasteless, odorless and non-toxic gas. When it is mixed into the air, it cannot be seen, touched, or smelled, but when mixed with air to a certain concentration, it can burn or explode when encountering fire. Mine gas disaster is one of the major natural disasters in coal mines. It not only affects the normal production of the mine, but also threatens the life safety of underground personnel. Gas monitoring mainly relies on various instruments to monitor the gas concentration in real time so that measures can be taken in time. However, the existing gas concentration monitoring system is often insufficient in monitoring, insensitive in response, inaccurate in detection data, and often cannot be detected when the gas concentration is too low. Conte...

AI Technical Summary

Problems solved by technology

However, the existing gas concentration monitoring system is often insufficient in monitoring, insensitive in response, inaccurate in detection data, and often cannot be detected when the gas concentration is too low

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