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- Title
A speckle-interferometric setup for contactless measurements of the velocity of rayleigh ultrasonic waves.
- Authors
Vladimirov, A. P.; Gorkunov, E. S.; Eremin, P. S.; Zadvorkin, S. M.; Shadrin, M. V.; Solov'ev, K. E.
- Abstract
The velocity of a Rayleigh wave was determined by measuring its propagation time between two Iaser-illuminated small areas of a rough surface. It is sh own that, if a Rayleigh wave passes over these areas, a photodiode twice detects signals proportional to the surface displacement in the speckle overlap region. In contrast to the previous variant, signal-distorting reflections are eliminated in the instrument. A sample holder excluding adjustment of the interferometer upon a change in the object size has been manufactured. A new technique for determining the time interval between two signals is used. The instrument operates at a frequency of 5 MHz, and the distance between the areas is adjusted in the range 5–100 mm. The rms deviation of the velocity from the average value for ten measurements is 8 × 10–4.
- Subjects
RAYLEIGH waves; SEISMIC waves; SIGNALS &; signaling; SOUND waves; INTERFEROMETERS; OPTICAL instruments
- Publication
Instruments & Experimental Techniques, 2010, Vol 53, Issue 1, p118
- ISSN
0020-4412
- Publication type
Article
- DOI
10.1134/S0020441210010197