Measuring

Details Measuring Measuring

1986-08-04

1988-10-11

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356358, G01B 902

Patent

active

047766980

ABSTRACT:
At least three detectors disposed on a line perpendicular to a straight line fringe pattern and on centers at one-fourth the fringe period provide signals indicative of the intensities of the pattern incident on them. The signals are manipulated to render equal the fringe intensity terms of the expressions from the sinusoidally varying signals as part of the procedure for deriving the phase value. Derivation of the phase value is a step in derivation of displacement. The fringes are created in an interferometric device or from a sinusoidally varying grating.

REFERENCES:
patent: 2462292 (1949-02-01), Snyder, Jr.
patent: 3230380 (1966-01-01), Cooke
patent: 4212073 (1980-07-01), Balasubramanian
patent: 4225240 (1980-09-01), Balasubramanian
patent: 4552457 (1985-11-01), Biallorenzi et al.
patent: 4566794 (1986-01-01), Hanse
patent: 4641972 (1987-02-01), Halioua et al.
patent: 4647206 (1987-03-01), Kunzmann et al.

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