Gas outburst sensor based on sound wave principle

Abstract

The invention discloses a gas outburst sensor based on a sound wave principle and belongs to a gas sensor. The gas outburst sensor comprises a casing, a frontal sound cavity, an ultrasound piezoelectric film, lateral sound cavities, metal films, fixing electrode plates and a lead, wherein the frontal sound cavity is arranged in front of the casing, the lateral sound cavities are arranged on the side of the casing, the ultrasound piezoelectric film is connected in the frontal sound cavity, the metal films and the fixing electrode plates are sequentially connected in the lateral sound cavities, the lead and the ultrasound piezoelectric film are connected at the back of the casing, at the same time, the lead, the metal films and the fixing electrode plates are arranged, the frontal sound cavity and the ultrasound piezoelectric film form an ultrasonic detector, the number of the lateral sound cavities, the metal films and the fixing electrode plates is respectively two, the lateral sound cavities, the metal films and the fixing electrode plates form two low-frequency acoustic detectors, and by the aid of detection of high-frequency sound waves and low-frequency sound waves, sound waves produced by gas jet which is ejected out of seams of coal layers can be analyzed. The gas outburst sensor has the advantages that high-frequency sound wave signals and low-frequency sound wave signals which are ejected out by the high-pressure gas in the coal layers through seams of the coal layers can be detected, and real-time monitoring for mine gas outburst is achieved.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a gas outburst sensor based on the sound wave principle. technical background [0002] Gas outburst is a major disaster that is prone to occur in coal mine production. There are many reasons for gas outburst. The most basic reason is that the gas accumulation in the coal seam generates a large pressure. . Due to the complexity of the mechanism of gas outburst, there is no better method for real-time monitoring. Contents of the invention [0003] The purpose of the present invention is to provide a gas outburst sensor to solve the problem of real-time monitoring of coal mine gas outburst. [0004] In order to realize a gas outburst sensor based on the acoustic wave principle of the present invention, it comprises: a shell, a frontal acoustic cavity, an ultrasonic piezoelectric film, a side acoustic cavity, a metal film, fixed electrode sheets and lead wires; There is a side acoustic cavity on ...

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Problems solved by technology

Due to the complexity of the gas outburst mechanism, there is no better method for real-time monitoring

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