Remote measurement of near-surface physical properties using optically smart surfaces
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United States of America Patent
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Oct 28, 1997
Grant Date -
N/A
app pub date -
Jul 2, 1993
filing date -
Jul 2, 1993
priority date (Note) -
Expired
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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.
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