Acoustic detection and blind signal separation-based air tightness monitoring method and apparatus

Abstract

The invention discloses an acoustic detection and blind signal separation-based air tightness monitoring method and apparatus. The objective of the invention is to solve the problems of inconvenient wire leading due to high air pressure, incapability of positioning gas leakage positions and incapability of identifying multiple-point gas leakage in the application of air tightness monitoring and detection of equipment of compressors and gas tanks. According to the acoustic detection and blind signal separation-based air tightness monitoring method of the invention, a plurality of high-sensitivity acoustic sensors are bonded at different positions of a detected container through utilizing a turbulent flow sounding effect in a gas leakage process; acoustic signals are conditioned and amplified; after being acquired by a microprocessor, the conditioned and amplified acoustic signals are subjected to blind signal separation processing; recognition of multiple-point gas leakage and gas leakage position positioning are performed through waveform comparison and signal intensity comparison; light flashing and tweeting are adopted to perform warning; and signal waveforms, gas leakage positions and the number of gas leakage points are displayed on an LCD screen. The acoustic detection and blind signal separation-based air tightness monitoring method and apparatus of the invention can be used for long-term gas leakage online monitoring of equipment such as pipelines and containers, and can be also used for air tightness quality detection of products. The acoustic detection and blind signal separation-based air tightness monitoring method and apparatus have the advantages of high accuracy, convenient operation and low price.

Description

【Technical field】 [0001] The present invention relates to the field of airtightness, air leakage detection and on-line monitoring of equipment with pressure difference between containers, compressors, pipelines, tires, etc. and the external environment, in particular to an airtightness monitoring method based on acoustic detection and blind signal separation with the device. 【Background technique】 [0002] Air tightness is a very important parameter of equipment such as containers and compressors. Conventional air tightness testing methods include pressure method, flow method and bubble method. The pressure method puts the acoustic sensor in the container, pressurizes it with air, and then seals the container. After a period of time, if the air pressure in the container decreases, it indicates that there is an air leak, and the faster the rate of decline, the more serious the air leak. The flow measurement method is to install a flowmeter between the measured container and...

AI Technical Summary

Problems solved by technology

This method is convenient, cheap, intuitive, can be monitored online for a long time, and has good accuracy; helium mass spectrometry has high accuracy, but the cost is too high

Although these two methods are accurate, they still cannot determine the location of the air leak, nor can they determine whether there are multiple air leaks

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