Homodyne interferometer and method of sensing material

Details Homodyne interferometer and method of sensing material Homodyne interferometer and method of sensing material

1997-12-22

1999-05-04

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356357, 73656, G01B 9021

Patent

active

059009357

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 multiple quantum well 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.

REFERENCES:
patent: 5131748 (1992-07-01), Monchalin et al.
patent: 5680212 (1997-10-01), Blouin et al.

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