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Korean Journal of Materials Research, Vol.17, No.5, 239-243, May, 2007
지상탱크의 부식감지를 위한 음향방출시험에서 발생한 전자기간섭신호의 특성 연구
A Study on the Characteristics of Electronic Magnetic Interference(EMI) in Acoustic Emission Testing for Corrosion Detection of Ground Tank
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The evaluation and comparison have been made for the EMI noise which was included in the signal from the sensors in the acoustic emission testing for the bottom plate of ground tank at full. The EMI signal has been classified into two types. One is the signal with very short AE count, and this signal possibly can be filtered by front end filter setting of the channel count with low level of 4 and high level of . The other EMI signal occurred from CH 1, CH 3 and CH 10, and had high and constant duration with high energy and count (maximun duration > ), and has characteristic gradient of accumulation amplitude distribution. This signal should be removed in the AE signal evaluation by filtering, because this may affect to the total gradient.
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