Ultrasoud detection based on confocal Fabry-Perot interferometer

Laser ultrasonic technology has been paid more and more attention in the NDT field due to its outstanding ability of non-contact measurements. As a good vibration measurement technology, CFPI (confocal Fabry-Perot interferometer) method is sensitive to the laser frequency shift caused by the ultrasonic wave propagation. In this paper, a laser ultrasonic receiver system based on the CFPI method is established, and the system parameters are analyzed in order to obtain an optimal resolution. Also some initial experiment results are presented to certify this system ability.