CN202494665U - Rapid processing device of eddy current exciting sound emission signal - Google Patents
Rapid processing device of eddy current exciting sound emission signal Download PDFInfo
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- CN202494665U CN202494665U CN201220011293XU CN201220011293U CN202494665U CN 202494665 U CN202494665 U CN 202494665U CN 201220011293X U CN201220011293X U CN 201220011293XU CN 201220011293 U CN201220011293 U CN 201220011293U CN 202494665 U CN202494665 U CN 202494665U
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- acoustic emission
- sound emission
- fast fourier
- eddy current
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Abstract
The utility model provides a rapid processing device of an eddy current exciting sound emission signal. The rapid processing device comprises a signal collecting system, a signal preamplifier, a data collecting card, a band-pass filtering system, a characteristic extractor based on fast Fourier transformation and a locator. A sound emission signal collected by the signal collecting system is amplified by the signal preamplifier, input into the data collecting card and converted into a digital signal; and after the signal passes through the band-pass filtering system, characteristics are extracted from the signal by using fast Fourier transformation, so that defects are judged and located. According to the utility model, by using the fast Fourier transformation, an electromagnetic sound emission signal of a metal sheet crack type surface defect of a non-ferromagnetic material can be rapidly processed, so that the rapid processing device provided by the utility model has the advantages of high processing speed, obvious signal characteristic and high credibility; and by using the technology, noise interference caused by outside environment to a sound emission technology is reduced, so that requirements of easiness in use, convenience and rapidness in engineering application can be satisfied, and good industrial application values are obtained.
Description
The present invention is the signal quick treatment device of eddy current excitation acoustic emission, relates to the treating apparatus of the acoustic emission signal of sheet metal under the electric magnetization.
Background technology
Development along with manufacturing technology; Require material under high temperature, high pressure, high-speed and high load capacity, good Performance And Reliability to be arranged; This makes the detection of only doing indivedual cross sections can't satisfy the requirement of industry, and acoustic emission becomes the important detection method that concerns people's livelihood secure context with its high sensitivity and dynamic monitoring characteristic.There is a difficult problem that is difficult to from overall signal, extract the local defect feeble signal in the tradition acoustic emission always, and for the commercial Application of reality, this has greatly limited the confidence level and the range of application of acoustic emission testing technology.Eddy current excitation acoustic emission detection method can excite acoustic emission signal at fault location effectively, but how to handle be a problem demanding prompt solution to the acoustic emission signal initiatively under the energisation mode.
Summary of the invention
The present invention uses Fast Fourier Transform (FFT), can realize that fast processing that the electromagnetic sound to the sheet metal crack type surface imperfection of nonferromagnetic material transmits is to satisfy the needs of commercial Application.
Technical scheme of the present invention: signal acquiring system (2), signal preamplifier, data collecting card, the bandpass filtering system, based on the feature extraction (3) of Fast Fourier Transform (FFT), location (4).The acoustic emission signal that signal acquiring system collects is input to data collecting card and converts digital signal into after signal preamplifier amplifies; After the bandpass filtering system, use Fast Fourier Transform (FFT) to carry out the feature extraction of signal, realize judgement, and realize the location defective.
Signal acquiring system (2) is made up of piezoelectric sensor array, coupled system and transmission cable, realizes pouncing on of faint original acoustic emission signal caught and gathered.
Based on the feature extraction (3) of Fast Fourier Transform (FFT), use fast Fourier algorithm respectively the acoustic emission voltage signal of gathering to be carried out time and frequency domain analysis, realize fast processing to signal.After the frequency domain conversion, extract the characteristic peaks frequency amplitude intensity different exciting currents under, and at the corresponding point of cartesian coordinate system the inside sign of two dimension, be connected to the Kaiser effect point that to see defective behind the curve clearly.
The present invention uses simple fast Fourier algorithm, can realize the feature extraction of flaw indication, and the acoustic emission signal of output has well reading property after using simple method to handle, and has improved the accurate decision-making ability to defective.
Description of drawings
Fig. 1 is an one-piece construction block diagram of the present invention;
Fig. 2 is the signal acquiring system schematic diagram;
Fig. 3 is based on the feature extraction schematic diagram of Fast Fourier Transform (FFT);
Fig. 4 is positioning principle figure;
Embodiment
Below in conjunction with instance and accompanying drawing the signal rapid treating technology of eddy current excitation acoustic emission is made detailed description.
As shown in Figure 1, the acoustic emission signal that signal acquiring system (2) collects is input to data collecting card and converts digital signal into after signal preamplifier amplifies; After the bandpass filtering system, use Fast Fourier Transform (FFT) to carry out the feature extraction (3) of signal, realize judgement, and realize location (4) defective.
As shown in Figure 2, signal acquiring system (2) is made up of piezoelectric sensor array, coupled system and transmission cable, realizes pouncing on of faint original acoustic emission signal caught and gathered.
As shown in Figure 3, based on the feature extraction (3) of Fast Fourier Transform (FFT), use fast Fourier algorithm respectively the acoustic emission voltage signal of gathering to be carried out time and frequency domain analysis, realize fast processing to signal.After the frequency domain conversion, extract the characteristic peaks frequency amplitude intensity different exciting currents under, and at the corresponding point of cartesian coordinate system the inside sign of two dimension, be connected to the Kaiser effect point that to see defective behind the curve clearly.
As shown in Figure 4, use three or four sensors in two dimensional surface location are formed arrays and are positioned.Use three sensor location generally can obtain two anchor points, i.e. a true AE source and a pseudo-AE source.Adopt four sensors to constitute the rhombus array and carry out the two dimensional surface location, increased a constraint condition, have to a real AE source.If by probe S
1And S
3Between time difference Δ t
1Obtain hyperbolic curve 1, by probe S
2And S
4Between time difference Δ t
2Obtain hyperbolic curve 2, the AE source is Q, probe S
1And S
3Spacing is a, probe S
2And S
1Spacing be b, velocity of wave is V, the time difference that arrives sensor through signal can obtain the accurate position of signal source.
Claims (3)
1. eddy current encourages the signal quick treatment device of acoustic emission, it is characterized in that technical scheme comprises: signal acquiring system (2), and signal preamplifier, data collecting card, the bandpass filtering system, based on the feature extraction (3) of Fast Fourier Transform (FFT), location (4); The acoustic emission signal that signal acquiring system collects is input to data collecting card and converts digital signal into after signal preamplifier amplifies; After the bandpass filtering system, use Fast Fourier Transform (FFT) to carry out the feature extraction of signal, realize judgement, and use the two dimensional surface location to realize defect location defective.
2. the signal quick treatment device of eddy current excitation acoustic emission according to claim 1; Its characteristic also is; Signal acquiring system (2) is made up of piezoelectric sensor array, coupled system and transmission cable, realizes pouncing on of faint original acoustic emission signal caught and gathered.
3. the signal quick treatment device of eddy current excitation acoustic emission according to claim 1; Its characteristic also is; Two dimensional surface location is used three or four sensors to form arrays and is positioned, and the time difference that arrives sensor through signal can obtain the accurate position of signal source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220011293XU CN202494665U (en) | 2012-01-12 | 2012-01-12 | Rapid processing device of eddy current exciting sound emission signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220011293XU CN202494665U (en) | 2012-01-12 | 2012-01-12 | Rapid processing device of eddy current exciting sound emission signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202494665U true CN202494665U (en) | 2012-10-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220011293XU Expired - Fee Related CN202494665U (en) | 2012-01-12 | 2012-01-12 | Rapid processing device of eddy current exciting sound emission signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202494665U (en) |
-
2012
- 2012-01-12 CN CN201220011293XU patent/CN202494665U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121017 Termination date: 20140112 |