Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1993-03-16
1995-03-07
Chilcot, Jr., Richard E.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
356 32, G01B 1116, C09K 1900
Patent
active
053947525
ABSTRACT:
A method is provided for determining shear direction wherein a beam of white light is directed onto the surface of a liquid crystal coating to cause the white light to be dispersed (reflected) from the surface in a spectrum having bands of different colors in a fixed spatial (angular) sequence. The system is calibrated by locating a observer, e.g., a video and movie camera, such that a particular color band (preferably at or near the center of the reflected spectrum) is observed to thereby provide a reference color band. Because the application of shear causes either clockwise or counterclockwise rotation of the reflected spectrum dependent on the direction of the shear, a determination is then made of the reflected color band observed by the observer when the surface of the liquid crystal is subjected to shear to thereby determine the direction of the shear based on the directional (rotation) relation of the observed color band with respect to the reference color band in the spatial sequence of color bands.
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Chilcot Jr. Richard E.
Dombroske George M.
Lupuloff Harry
Miller Guy M.
The United States of America as represented by the Administrator
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