Remote measurement of distance and thickness using a deflected laser beam

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Abstract
A remote optical technique of measuring distance and thickness is described which relies on a measurement of the time a laser beam deflected at a definite speed takes to travel from a starting point on a reference plane to a final point on the object. Its significant features are high measuring speed, high resolution, flexibility with regard to measurement range and distance between reference plane and probe, insensitivity to surface properties of the object, and rugged design. It is, therefore, suitable for a large variety of applications, especially in industrial metrology.

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