Methods and apparatus for remotely sensing the orientation of an

Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet

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356375, G01N 2186

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active

058118268

ABSTRACT:
A method and apparatus for remotely sensing the orientation of an object takes advantage of the fact that, for flat surfaces, a change in radiation frequency illuminating the object produces a global translation at the detector plane of the speckle pattern reflected from the object. An object is illuminated with radiation of two different frequencies and the corresponding speckle patterns are compared to determine the magnitude and direction of shift from the first speckle pattern to the second. The magnitude and direction of the speckle pattern shift indicates the orientation of the object.

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