Non-contact measurement of surface profile

Details Non-contact measurement of surface profile Non-contact measurement of surface profile

1980-06-11

1982-09-14

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With light attenuation

250237G, 356 1, G01B 1100, G01C 320

Patent

active

043492770

ABSTRACT:
A parallax method of wavelength labeling is based on optical triangulation. A complementary color pattern projected onto the surface is characterized by a continuous variation of the power ratio of two wavelength bands, and the profile can be measured at all points in the field of view. Shifts of the wavelength bands on separate detector arrays correspond to profile deviations. A signal processor calculates a normalized signal that is independent of surface reflectivity and roughness variations; the phase shift of this signal yields depth data from which the surface profile can be mapped.

REFERENCES:
patent: 3619065 (1971-11-01), Agnew
patent: 4158507 (1979-06-01), Himmel
patent: 4175862 (1979-11-01), DiMatteo et al.
patent: 4180329 (1979-12-01), Hildebrand
patent: 4227813 (1980-10-01), Pirlet

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