A laser interferometer system using the modified Michelson interferometer was made to measure the acoustic wave displacement generated by the pencile breaking.
The reference voltage of the system was 2.2 Volts and the sensitivity of the minimum displacement detected was 0.457 Å/mV, equivalent to the displacement of 0.455Å with the frequency bandwith 2 MHz.
The system can be used to calibrate the piezoelectric transducer and the system has shown to be superior to NBS conical piezoelectric transducer in flat frequency response between 1 kHz to 2 MHz.
