National Institute of Advanced Industrial Science and Technology

Ishikawajima Inspection & Instrumentation Co., Ltd

Tomio Nakajima

Hiroshi Tsuda

Takahiro Arakawa

Jung-Ryul Lee

There is provided a system always capable of detecting AE/ultrasound received by an FBG, even when the FBG receives a change in temperature or strain and the Bragg wavelength is fluctuated. 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.

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Yokohama, Japan

Tomio Nakajima