A SENSITIVE AND STABLE CONFOCAL FABRY－PéROT INTERFEROMETER FOR SURFACE ULTRASONIC VIBRATION DETECTION

A new confocal Fabry－Pérot interferometer (CFPI) has been constructed. By using both of the conjugate rays, the sensitivity of the system was doubled. Moreover, the negative feedback control loop of a single-chip microcomputer (MCS-51) was applied to stabilize the working point at an optimum position. The system has been used in detecting the piezoelectric ultrasonic vibration on the surface of an aluminium sample.