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Signal processing technology for electromagnetic excitation acoustic emission

An acoustic emission signal and signal processing technology, applied in the direction of processing the detection response signal, etc., can solve the problems of limiting the reliability and application scope of the acoustic emission detection technology, and achieve the effect of improving the accurate judgment ability and good readability.

Inactive Publication Date: 2012-08-15
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

Traditional acoustic emission technology has always been difficult to extract weak signals of local defects from the overall signal. For practical industrial applications, this greatly limits the reliability and application range of acoustic emission detection technology

Method used

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  • Signal processing technology for electromagnetic excitation acoustic emission
  • Signal processing technology for electromagnetic excitation acoustic emission
  • Signal processing technology for electromagnetic excitation acoustic emission

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Embodiment Construction

[0012] The rapid signal processing technology of eddy current excitation acoustic emission will be described in detail below in combination with examples and accompanying drawings.

[0013] like figure 1 As shown, the high-sensitivity, high-speed, and distortion-free signal acquisition system (2) collects the acoustic emission signal after being amplified by the pre-signal amplifier and input to the data acquisition card to convert it into a digital signal; Fourier transform is used to extract the features of the signal (3), to realize the judgment of the defect, and to realize the positioning (4).

[0014] like figure 2 As shown, the signal acquisition system (2) is composed of a piezoelectric sensor array, a coupling system and a transmission cable, and realizes capturing and collecting weak original acoustic emission signals.

[0015] like image 3 As shown, based on the feature extraction (3) of the fast Fourier transform, the fast Fourier algorithm is used to analyze ...

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Abstract

The invention relates to a signal processing technology for electromagnetic excitation acoustic emission. The signal processing technology comprises the following steps of: performing feature extracting and positioning based on fast fourier transform by a signal acquisition system, a preamplifier, a data acquisition card and a band-pass filtering system; amplifying an acoustic emission signal collected by the high-sensitivity, high-speed and distortion-less signal acquisition system by the preamplifier, and then inputting into the data acquisition card for converting into a digital signal; and after passing by the band-pass filtering system, performing feature extraction on the digital signal by adopting fast fourier transform, thereby realizing the judging and positioning on the defects. According to the signal processing technology provided by the invention, the quick treatment for the electromagnetic acoustic emission signal of the crack surface defect of the metal sheet made of a non-ferromagnetic material is realized by adopting the fast fourier transform; the signal processing technology has the characteristics of high processing speed, obvious signal feature and high reliability; according to the technology, the noise jamming to the acoustic emission technology caused by external environment is reduced; the usability and portability demands on an engineering application are met; and the industrial application value is excellent.

Description

technical field [0001] The invention relates to the signal processing technology of electromagnetic excitation acoustic emission, and relates to the processing technology of the acoustic emission signal of a metal plate under electromagnetic excitation. Background technique [0002] With the development of manufacturing technology, materials are required to have good performance and reliability under high temperature, high pressure, high speed and high load, which makes the detection of individual cross-sections unable to meet the requirements of the industry. The nature and dynamic monitoring characteristics have become an important detection method related to people's livelihood and safety. Traditional acoustic emission technology has always had the difficulty of extracting weak signals of local defects from the overall signal. For practical industrial applications, this greatly limits the reliability and application range of acoustic emission detection technology. The ed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/46
Inventor 金亮李劲松
Owner TIANJIN POLYTECHNIC UNIV
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