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

A blind signal separation, air tightness detection technology, applied in the direction of detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, etc. High precision of gas and helium mass spectrometry

Active Publication Date: 2015-01-28
XI AN JIAOTONG UNIV
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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 i

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

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Embodiment Construction

[0056] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] figure 1 It is the principle diagram of air tightness detection based on acoustic detection and blind signal separation. Because the gas tank is cylindrical, the corners of the gas tank are welded. Usually, the weld is prone to cracks under high pressure due to false welding or local welding is not strong enough, resulting in air leakage. Therefore, in order to reduce the number of acoustic sensors, the acoustic sensors are pasted on the outside of each side and the bottom surface of the gas tank. Obviously, if there is an air leak in the lower left corner of the gas tank, the output signals of No. 6 and No. 7 conditioning circuits will be the largest, because the acoustic signal will attenuate with the increase of the propagation distance, so the signal intensity perceived by the acoustic sensor closest to it is the highest. ...

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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...

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Application Information

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IPC IPC(8): G01M3/24
Inventor 汤晓君赵明寇福林张徐梁薛慧云
Owner XI AN JIAOTONG UNIV
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