13 October 1999 Real-time imaging using the INEEL Laser Ultrasonic Camera
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Abstract
A new approach to the measurement of ultrasonic vibrations has been developed at the INEEL. This system utilizes heterodyne interferometric detection in a photorefractive material to provide real time, full field images of ultrasonic vibration amplitude and phase without scanning. The INEEL Laser Ultrasonic Camera has linear response for ultrasonic displacement (xi) < (lambda) divided by 4(pi) , approximately 45 nm displacement at a laser wavelength of 532 nm. In addition, the system exhibits flat response and narrow band detection for a broad range of vibration frequencies. The system is very robust, and has the potential for operation even in noisy industrial settings. A description of the system, representative data and several potential applications will be presented.
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Vance A. Deason, Kenneth L. Telschow, Gordon D. Lassahn, Scott M. Watson, Robert S. Schley, "Real-time imaging using the INEEL Laser Ultrasonic Camera", Proc. SPIE 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids, (13 October 1999); doi: 10.1117/12.365769; https://doi.org/10.1117/12.365769
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