Ultrasonic imaging of subsurface objects using photorefractive dynamic holography

Vance A. Deason; Kenneth L. Telschow; Scott M. Watson

doi:10.1117/12.449372

26 November 2001 Ultrasonic imaging of subsurface objects using photorefractive dynamic holography

Vance A. Deason, Kenneth L. Telschow, Scott M. Watson

Proceedings Volume 4448, Optical Diagnostics for Fluids, Solids, and Combustion; (2001) https://doi.org/10.1117/12.449372
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

The INEEL has developed a photorefractive ultrasonic imaging technology that records both phase and amplitude of ultrasonic waves on the surface of solids. Phase locked dynamic holography provides full field images of these waves scattered from subsurface defects in solids, and these data are compared with theoretical predictions. Laser light reflected by a vibrating surface is imaged into a photorefractive material where it is mixed in a heterodyne technique with a reference wave. This demodulates the data and provides an image of the ultrasonic waves in either 2 wave or 4 wave mixing mode. These data images are recorded at video frame rates and show phase locked traveling or resonant acoustic waves. This technique can be used over a broad range of ultrasonic frequencies. Acoustic frequencies from 2 kHz to 10 MHz have been imaged, and a point measuring (non-imaging) version of the system has measured picometer amplitudes at 1 Ghz.

Citation Download Citation

Vance A. Deason, Kenneth L. Telschow, and Scott M. Watson "Ultrasonic imaging of subsurface objects using photorefractive dynamic holography", Proc. SPIE 4448, Optical Diagnostics for Fluids, Solids, and Combustion, (26 November 2001); https://doi.org/10.1117/12.449372

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