Vibration Analysis by Wavefront Modulated Holography

概要

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Wavefront modulated holography is proposed to measure the relative phase of each part of a vibrating object. The fact that there is no need for phase adjustment of the modulated reference beam is a remarkable merit. To realize the wavefront modulation, a seesaw mirror is used. In this method, the magnitude of the modulated phase of the reference beam is related to the position on the recorded plate. It is possible to measure the amplitude of the object vibration and the relative phase fo each part of the object. To compare the calculated value with the measured value, this method is applied to the measurement of the vibration of two reeds whose relative phases are known. The measured value agrees with the predicted value. A small amplitude vibration less than λ/4 can also be detected by this method.
社団法人応用物理学会の論文
1978-10-05