HOMODYNE INTERFEROMETER USING PHOTOREFRACTIVE POLYMER COMPOSITE AND METHOD OF SENSING MATERIAL
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United States of America Patent
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app pub date -
Mar 12, 1999
filing date -
Dec 22, 1997
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Abandoned
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Abstract
Faults, dimensions and other characteristics of a material or structure are sensed by a coherent beam's reflection from the material during ultrasonic or very fast vibration. The reflected beam acquires a phase substantially different from its original phase and from the phase of a reference beam split from the common source beam. The reflected beam and the reference beam are superimposed by diffraction in a photorefractive polymer composite adaptive holographic beamsplitter, and the superimposed beams are detected by a photodetector capable of detecting small interference changes from ultrasonic surface displacements or perturbations. An apparatus and method defining an improved homodyne interferometer for performing the method is described.
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