Abstract
Laser probe for the field measurements of surface acoustic waves (SAW) is performed using an optical interferometer with a He–Ne laser. This laser probe is composed of two optical paths named “twin path” disposed so closely and symmetrically with each other that the measurements are not disturbed by acoustic noise, low frequency ambient vibration, atmospheric fluctuation or room temperature change. A minimum detectable amplitude of 3×10-4 Å was attained by this laser probe in measurement of the vibration amplitude of quartz plate with final noise band width of 0.017 Hz.16)The operation and design of a twin path interferometer, the amplitude and the energy profile of SAW are described.
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