EXPERIMENTAL TRANSFER FUNCTIONS OF PRACTICAL ACOUSTIC EMISSION SENSORS
Kanji Ono, Hideo Cho · 2008
We have obtained the transfer functions of a wide range of AE sensors commonly available and utilized. These were determined by a pulse-laser excitation in conjunction with a laser interferometer and a deconvolution procedure typically in the frequency domain. Using typical source waveforms and a convolution procedure, one can then visualize waveforms expected out of these AE sensors. In turn, one can also deduce approximate source waveforms from AE signal waveforms, which a similar sensor has detected. Some sensors showed displacement response, while another gave velocity response. Some unexpected results are found, including a mixed response of a small sensor and location sensitivity of otherwise a well-behaved sensor.