Abstract
A novel acoustic emission (AE) sensor system based on fiber Bragg grating is proposed. Two identical phase-shifted FBGs (PS-FBGs) are cascaded after an amplified spontaneous emission (ASE) source, used as filter and sensor respectively. By measuring the change of the output power, the AE signal and low frequency vibration can be detected. Because of the sharp peak in the middle of the PS-FBG spectrum due to the phase shift, the sensitivity of the system is guaranteed while preventing the photo-detector from saturation. The proposed system has the advantages of simple configuration, no-resonance, electromagnetic interference immunity and low cost.
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