Abstract
By the use of a light source of two wavelengths and by the sinusoidal phase modulation of the reference wave in recording a hologram of a vibrating object, small amplitude vibrations which are hardly observable by the normal time average method can be detected as a slight color variation against the colored background of stationary regions on the reconstructed image. Theoretical analysis of the color variation on the image is given and an experiment has been performed by using a He–Ne laser and an Ar-ion laser as light sources. The color variation is easily detectable and the colored background of stationary regions allows the shape of the object to be clearly recognized. The difference in color variation also helps to determine the phase of the object vibration.
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