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

Figure 10

Example of detected AE waveforms by C-FBG sensor and comparison of detected and input frequencies. The 45 degree line shown in (b) occurs when the C-FBG sensor accurately detects the input frequency. The black circles denote the maximum negative and positive error.

(a) Examples of detected AE waveform by C-FBG sensor at each input frequency, its FFT, and WMFD (large dot is the center of gravity position for frequency component in WMFD)

(b) Comparison of detected AE frequencies and input frequencies