Method and device for contactless optical measurement of distanc

Details Method and device for contactless optical measurement of distanc Method and device for contactless optical measurement of distanc

1986-05-07

1989-12-05

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

250201, 356 1, 356375, G01B 1114

Patent

active

048848883

ABSTRACT:
A method and device for contactless optical measurement of distance changes, in which two light beams (5, 6) are directed from a measuring table (1) through an optical system (9) in such a manner that they intersect on the surface of the object (11) and in the event of distance changes, the measuring table (1) is adjusted until a scattered light maximum is produced. The light beams (5, 6) exhibit a frequency displacement relative to one another, so that the scattered light which is produced is modulated; this can readily be separated from interfering light by means of amplifiers (15) which are selective in frequency, and in this manner an accurate determination of the scattered light maximum is made possible.

REFERENCES:
patent: 3125624 (1964-03-01), Illis et al.
patent: 3347129 (1967-10-01), Lohninser
patent: 3506839 (1970-04-01), Ando et al.
patent: 3693143 (1972-09-01), Kennedy
patent: 3768910 (1973-10-01), Zanoni

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