Advances in Materials Science and Engineering

Research Article

Acoustic Emission Measurement by Fiber Bragg Grating Glued to Cylindrical Sensor Holder

Figure 15

Examples of detected AE signal by resonance piezo-type AE sensor (resonant frequency: 250 kHz) and its FFT, its WT analysis, and WMFD in each region of the 3-point bending test.
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(a) Example of detected signal and analysis results in Region I
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(b) Example of detected signal and analysis results in Region II
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(c) Example of detected signal and analysis results in Region III
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(d) Example of detected signal and analysis results in Region IV