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.
(a) Example of detected signal and analysis results in Region I
(b) Example of detected signal and analysis results in Region II
(c) Example of detected signal and analysis results in Region III
(d) Example of detected signal and analysis results in Region IV