Abstract
Photorefractive processing of optical interference offers a noncontacting optical method for vibration detection that forms an optical ‘‘lock-in’’ amplifier. Multiwave mixing with synchronous detection allows measurement of both the vibration amplitude and phase of a vibrating surface directly as a function of the excitation frequency. Narrow bandwidth detection with flat frequency response can be achieved at frequencies above the photorefractive response (∼100 Hz). A minimum detectable displacement amplitude of a few picometers has been demonstrated for a point measurement, with the possibility of further improvement. The method can also be configured to provide full-field imaging of resonant vibrational modes of materials with various microstructures and shapes. Both specularly and diffusely reflecting surfaces can be accommodated. Results will be presented showing the noncontacting imaging capabilities for vibrational spectral analysis of structures and characterization of material properties that these sensors provide for smart systems. [Work suported by the U.S. Department of Energy.]
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