Abstract
A calibration method for the laser heterodyne vibration measurement is described that includes generation of phase modulated signals simulating vibrations of various frequencies and amplitudes and construction of a calibration curve by making use of the measured relationship between the amplitude of the simulating signals and the output of the phase demodulator. The calibration curve for a general vibration that has its frequency components within the range from 100Hz to 30kHz, was obtained in the present experimental equipment. Validity of the calibration method was assured by the scanning laser heterodyne technique.
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