a Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; b Department of Physics, University of Science and Technology, Beijing 100083, China; c Mechanical Engineering School, University of Science and Technology, Beijing 100083, China
Abstract 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.
Received: 02 March 2001
Revised: 23 February 2001
Accepted manuscript online:
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