A Michelson interferometer using a CW laser-light source has been used to measure the amplitude of small-order vibrational displacements. Measurements over the surface of a vibrating plate at points 12 mm in diameter are reported. Magnitudes of 0.1–5000 Å at frequencies of 100 Hz–20 kHz have been measured with higher and lower limits possible. The advantages of the technique are discussed.
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DeFerrari et al. (1966) studied this question.