PS-FBGPhase-Shifted Fiber Bragg Grating (microwave theory)
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PS-FBG sensors in the different detection configurations were used to receive the input signals with central frequency of 150, 300 and 450 kHz, respectively.
Hence, PS-FBG sensor in the ADRM configuration have a feasible remote sensing of the [A.sub.0] and [S.sub.0] modes included in the original AE wave propagating from AE source to the adhesive point.
We glued the PS-FBG sensor in the ADRM configuration on the plate to detect AEs generated during the bending test.
The threshold of the channel connected with the PS-FBG and with PZT sensors were set to eliminate the noise generated by friction between the loading pin and specimen.
Because of the broad bandwidth of the PS-FBG sensor, it was determined that not only the E/F ratio but also the peak frequency of AE was useful for identifying damage types in the CFRP laminates.
Figure 3 (c) shows one more type of AE detected using the PS-FBG sensor.
As a result, 34 AE events were detected using the PS-FBG sensor in the ADRM configuration.
From the classification result, we were able to obtain a quantitative damage identification standard in the laminates [902/02]S based on AE detection using a PS-FBG sensor in the ADRM configuration.