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Proceedings Paper

Adaptive sensors of rough-surface ultrasonic vibrations based on the polarization self-modulation effect
Author(s): Kimmo Paivasaari; Alexei A. Kamshilin
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Paper Abstract

New interferometric technique for the linear detection of small out-of-plane vibrations of a rough surface caused by ultrasound is described. The technique is based on the polarization self-modulation effect in photorefractive crystals and does not involve light diffraction. The signal- to-noise ratio of the measured system is approaching to that of the classical homodyne interferometer. The system possesses the large field of view providing the measurements of small phase shift of a speckled wavefront. Moreover, the proposed interferometer is adaptive to slow environment changes with response time about 1 ms keeping ability to measure ultrasonic vibrations of as small amplitude as 0.1 nm. Comparison of the proposed technique with the photorefractive two-wave mixing is given. It is shown that the proposed technique has number of advantages providing higher signal-to-noise ratio and higher sensitivity.

Paper Details

Date Published: 22 May 2000
PDF: 11 pages
Proc. SPIE 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2000); doi: 10.1117/12.386727
Show Author Affiliations
Kimmo Paivasaari, Univ. of Joensuu (Finland)
Alexei A. Kamshilin, Univ. of Joensuu (Finland)


Published in SPIE Proceedings Vol. 4072:
Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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