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The AE ultrasonic detection system, and the material monitor which has that and the broadband illuminant which gives out
The AE ultrasonic detection system, and the material monitor which has that and the broadband illuminant which gives out
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机译:AE超声波检测系统,具有该超声波检测系统的物料监视器以及发出的宽带光源
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摘要
PROBLEM TO BE SOLVED: To provide a system always capable of detecting AE (elastic wave emission: acoustic emission)/ultrasound received by an FBG, even when the FBG receives a change in temperature or strain and the Bragg wavelength is fluctuated.;SOLUTION: In the AE/ultrasound detection system, the reflected light from the FBG is caused to enter a Fabry-Perot filter having an FSR equal to or greater than the reflection wavelength band of the FBG. A change in the intensity of the transmitted light corresponds to the AE/ultrasound received by the FBG. Alternatively, the reflected light from FBG is caused to enter two Fabry-Perot filters having an FSR equal to or greater than the reflection wavelength band of the FBG and having the filter-transmittance peak wavelengths different from each other by FSR/4. The intensity of the transmitted light from each of the two Fabry-Perot filters is converted into a voltage signal, and the individual signals are subjected to addition and subtraction processes. Thus, a signal having a large amplitude corresponding to the AE/ultrasound received by the FBG can be obtained.;COPYRIGHT: (C)2008,JPO&INPIT
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