CN107632064A - A kind of EDDY CURRENT interfering signal suppressing method - Google Patents
A kind of EDDY CURRENT interfering signal suppressing method Download PDFInfo
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- CN107632064A CN107632064A CN201710744208.8A CN201710744208A CN107632064A CN 107632064 A CN107632064 A CN 107632064A CN 201710744208 A CN201710744208 A CN 201710744208A CN 107632064 A CN107632064 A CN 107632064A
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- interference signal
- flaw indication
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- eddy current
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Abstract
The invention discloses a kind of EDDY CURRENT interfering signal suppressing method, the characteristics of flaw indication frequency bandwidth is more than based on interference signal frequency bandwidth in EDDY CURRENT, using two channels, two band-pass filtering methods, the interference signal in detection signal is effectively filtered out, influence of the interference signal to flaw indication is preferably minimized.
Description
Technical field
The present invention relates to a kind of lossless detection method, more particularly to a kind of EDDY CURRENT interfering signal suppressing method.
Background technology
Eddy current detection method is the conventional quality of materials detection method of metallurgy industry, wherein Automatic eddy current inspection system application
Relatively broad, a set of Automatic eddy current inspection system a, important indicator for weighing its performance quality is leakage, rate of false alarm, and it reacts
Repeatability of the equipment to same defect detection, this important indicator and equipment（Including detector device, probe, flaw detection main frame, biography
Send device）The performance and sample pipe of each several part, the uniformity of operation of equipment etc. are relevant, especially have with external environmental interference factor
Close, be a composite target.Assuming that detecting instrument signal to noise ratio is relatively low, interference signal can not effectively distinguish exclusion, then easily occur
Wrong report, then the leakage of equipment, rate of false alarm must be high.So to make equipment leakage rate of false alarm be reduced to it is minimum（Equal to 0）, only
Start with from many-sides such as instrument, probe, main frame, machine drivings, wherein improve detection device signal to noise ratio, remove all kinds of obstacles because
Element, even if in the case of especially various disturbing factors are unavoidable, in instrument, certain Digital Signal Processing side can be taken
Method, the various random interfering signal being mixed in detection signal is given and excluded.In the automatic eddy detection system of bar
In, the interference signal being commonly encountered is the caused vibration in transmitting procedure（Caused by diameter of rod is smaller, rigidity is softer）, with
And run into occur during barrier shock vibration etc., these vibration interference signals can it is vector superposed with flaw indication together with, make
Flaw indication is not easy therefrom to distinguish, so as to cause the leakage of detection device to report by mistake.
The content of the invention
It is an object of the invention to overcome the deficiency of prior art, there is provided a kind of EDDY CURRENT interfering signal suppressing method,
The characteristics of flaw indication frequency bandwidth is more than based on interference signal frequency bandwidth in EDDY CURRENT, using two channels, two bands
Filtering approach, filter out the interference signal in detection signal.
The technical solution adopted for the present invention to solve the technical problems is：A kind of EDDY CURRENT interfering signal suppressing method,
It is characterized in that：The characteristics of flaw indication frequency bandwidth is more than based on interference signal frequency bandwidth in EDDY CURRENT, using two
Channel, two band-pass filtering methods, comprise the following steps,
A. the detection signal of Eddy Current Testing Transducer collection passes through amplification, analog-to-digital conversion, and defect is included in detection signal now
Signal and interference signal, and flaw indication cannot be distinguished by identifying with interference signal；Then detection signal is led to respectively through two channels
Cross two bandpass digital filters；Described two bandpass digital filters are respectively adopted the different band logical of scope and are filtered, its
In bandpass digital filter bandpass range covering flaw indication frequency band and interference signal frequency band overlap-add region, i.e. the band
Logical digital filter causes flaw indication and the superposed signal of the interference signal of flaw indication frequency band range to pass through；Another band logical
The bandpass range of digital filter is outside Defect With Eddy Current Testing signal band, within interference signal frequency band, i.e. band logical numeral
Wave filter only causes interference signal to pass through；
B. vector calculus is carried out to the signal after two bandpass digital filters, i.e. the defects of after a band logical digital filtering
The superposed signal of signal and the interference signal in flaw indication frequency band range subtracts the interference letter after another band logical digital filtering
Number；The main body in detection signal after vector calculus is flaw indication, i.e., most of interference signal is reduced by vector calculus
Fall, identification of the remaining interference signal to flaw indication does not have an impact.
The invention has the advantages that a kind of EDDY CURRENT interfering signal suppressing method, is believed based on being disturbed in EDDY CURRENT
The characteristics of number frequency bandwidth is more than flaw indication frequency bandwidth, using two channels, two band-pass filtering methods, effectively filter out inspection
The interference signal surveyed in signal, influence of the interference signal to flaw indication is preferably minimized.
The present invention is described in further detail with reference to embodiments, but a kind of EDDY CURRENT interference signal of the present invention
Suppressing method is not limited to embodiment.
Brief description of the drawings
The present invention is further described for middle embodiment below in conjunction with the accompanying drawings.
Fig. 1 is two channels of the embodiment of the present invention, two band-pass filtering method schematic diagrames.
Fig. 2 is the detection signal schematic diagram before and after the AF panel of the embodiment of the present invention.
In figure, S1. flaw indication frequency bands, S2. interference signal frequency bands, S. flaw indications frequency band and interference signal frequency band it is folded
Add region, E. flaw indications, I. interference signals.
Embodiment
Embodiment, as shown in Figure 1 and Figure 2, a kind of EDDY CURRENT interfering signal suppressing method, it is characterised in that：Based on vortex
Interference signal frequency band S2 width is more than the characteristics of flaw indication frequency band S1 width in detection, using two channels, two band logical filters
Wave method, comprise the following steps,
A. the detection signal of Eddy Current Testing Transducer collection passes through amplification, analog-to-digital conversion, and defect is included in detection signal now
Signal E and interference signal I, and flaw indication E and interference signal I cannot be distinguished by identifying；Then detection signal is through two channels point
Do not pass through two bandpass digital filters；Described two bandpass digital filters are respectively adopted the different band logical of scope and filtered
Ripple, the bandpass range covering flaw indication frequency band S1's and interference signal frequency band S2 of one of bandpass digital filter is superimposed area
Domain S, the i.e. bandpass digital filter cause flaw indication E and the interference signal I of flaw indication frequency band S1 scopes superposed signal
Pass through；The bandpass range of another bandpass digital filter is outside Defect With Eddy Current Testing signal band S1, interference signal frequency band
Within S2, i.e., the bandpass digital filter only causes interference signal I to pass through；
B. vector calculus is carried out to the signal after two bandpass digital filters, i.e. the defects of after a band logical digital filtering
The superposed signal of interference signal I in the range of signal E and flaw indication frequency band S1 subtracts dry after another band logical digital filtering
Disturb signal I；The main body in detection signal after vector calculus is flaw indication E, i.e., most of interference signal I is transported by vector
Calculate subduction to fall, identifications of the remaining interference signal I to flaw indication E does not have an impact.
Above-described embodiment is only used for further illustrating a kind of EDDY CURRENT interfering signal suppressing method of the present invention, but this hair
It is bright to be not limited to embodiment, any simple modification that every technical spirit according to the present invention is made to above example, etc.
With change and modification, each fall within the protection domain of technical solution of the present invention.
Claims (1)
- A kind of 1. EDDY CURRENT interfering signal suppressing method, it is characterised in that：Based on interference signal frequency bandwidth in EDDY CURRENT The characteristics of more than flaw indication frequency bandwidth, using two channels, two band-pass filtering methods, comprise the following steps,A. the detection signal of Eddy Current Testing Transducer collection passes through amplification, analog-to-digital conversion, and defect is included in detection signal now Signal and interference signal, and flaw indication cannot be distinguished by identifying with interference signal；Then detection signal is led to respectively through two channels Cross two bandpass digital filters；Described two bandpass digital filters are respectively adopted the different band logical of scope and are filtered, its In bandpass digital filter bandpass range covering flaw indication frequency band and interference signal frequency band overlap-add region, i.e. the band Logical digital filter causes flaw indication and the superposed signal of the interference signal of flaw indication frequency band range to pass through；Another band logical The bandpass range of digital filter is outside Defect With Eddy Current Testing signal band, within interference signal frequency band, i.e. band logical numeral Wave filter only causes interference signal to pass through；B. vector calculus is carried out to the signal after two bandpass digital filters, i.e. the defects of after a band logical digital filtering The superposed signal of signal and the interference signal in flaw indication frequency band range subtracts the interference letter after another band logical digital filtering Number；The main body in detection signal after vector calculus is flaw indication, i.e., most of interference signal is reduced by vector calculus Fall, identification of the remaining interference signal to flaw indication does not have an impact.
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| CN201710744208.8A CN107632064B (en) | 2017-08-25 | 2017-08-25 | Method for suppressing eddy current detection interference signal |
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| CN201710744208.8A CN107632064B (en) | 2017-08-25 | 2017-08-25 | Method for suppressing eddy current detection interference signal |
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| CN107632064A true CN107632064A (en) | 2018-01-26 |
| CN107632064B CN107632064B (en) | 2021-12-21 |
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| CN103973612A (en) * | 2013-01-25 | 2014-08-06 | 华为技术有限公司 | Near field reflection self-interference signal offset method and device |
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2017
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Patent Citations (6)
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| US3974442A (en) * | 1974-06-27 | 1976-08-10 | British Steel Corporation | Surface defect probe and dual channel apparatus with liftoff compensation |
| CN201229197Y (en) * | 2008-06-20 | 2009-04-29 | 宝山钢铁股份有限公司 | Filter arrangement for vortex flow sensor detecting system |
| CN102147429A (en) * | 2011-02-28 | 2011-08-10 | 中国科学院国家天文台 | Broadband microwave power meter and interference signal filtering method |
| JP2014130127A (en) * | 2012-11-28 | 2014-07-10 | Jfe Steel Corp | Magnetic flux leakage inspection device and inspection method |
| CN103973612A (en) * | 2013-01-25 | 2014-08-06 | 华为技术有限公司 | Near field reflection self-interference signal offset method and device |
| CN106789777A (en) * | 2015-11-19 | 2017-05-31 | 北京科技大学 | Wear digital interference in steel number energy simultaneous interpretation system eliminate, bypassing method and device |
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