"Sing-Around" Method for Acoustic Surface-Wave Velocity Measurements Using an Optical Probe

概要

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Combining an optical probe and the "sing-around" technique originally used in acoustic bulk-wave measurements, a simple and accurate measurement method of acoustic surface-wave (ASW) velocity is developed. The key point of this method is the use of a diffracted light pulse as the pulse-generator trigger pulse. The ASW, excited by a pulse-modulated rf signal, diffracts the laser beam incident on the sample surface. The photomultiplier-detected signal of the diffracted light beam is used to trigger the pulse generator, and the same process is repeated, resulting in a sequence of pulses. The repetition time of the sequence is measured at two different points of laser beam incidence to eliminate the delay time of the experimental-apparatus electric-circuity, and the surface-wave transit time corresponding to the distance between the two points is obtained.
社団法人応用物理学会の論文
1974-08-05