Remote measurement of near-surface physical properties using opt

Details Remote measurement of near-surface physical properties using opt Remote measurement of near-surface physical properties using opt

1993-07-02

1997-10-28

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356349, 356 285, 356 355, G01B 902

Patent

active

056822367

ABSTRACT:
A method and apparatus for remotely measuring such physical properties as surface temperature and strain on or near the surface of an object such as an aerodynamic model utilizes a sensor comprising a holographic diffraction grating in a thin film, formed on or affixed to the surface of the test object, thereby forming an "optically smart surface." The sensor is remotely illuminated by one or more optical address beams, which are preferably coherent laser beams. Optical beams diffracted from the surface of the sensor produce interference patterns in a remote photodetection apparatus which permits measurement in changes in grating spatial frequency caused by temperature changes or mechanical deformations of the object surface, or Doppler measurement of particle velocity in a sample volume produced by intersecting beams diffracted from the sensor hologram.

REFERENCES:
patent: 3953128 (1976-04-01), Holly
patent: 4690552 (1987-09-01), Grant et al.
patent: 4850693 (1989-07-01), Deason et al.
patent: 5141317 (1992-08-01), Bollhagen et al.

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