Optical displacement sensor using color variations to monitor di

Details Optical displacement sensor using color variations to monitor di Optical displacement sensor using color variations to monitor di

1988-03-15

1989-03-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, 250237R, G01J 350

Patent

active

048146013

ABSTRACT:
A moire fringe displacement sensor includes first and second gratings (3) (4), a polychromatic light source (1) illuminating the gratings, and a detector (8). The gratings are disposed such that a relative displacement of the first and second gratings causes a variation in the color of the light reaching the detector. The detector (8) comprises first and second photo-responsive elements (11) (12), the responsivity with respect to wavelength of the first element (11) being different from that of the second (12). Signals from the photo-responsive elements are fed to a micro-processor (15) which calculates the color of the light incident on the detector as represented by two or more parameters on the Chromaticity (CIE) Diagram, and interprets the color in terms of the displacement of the first and second gratings.

REFERENCES:
patent: 3553469 (1971-01-01), Stutz et al.
patent: 4334152 (1982-06-01), Dakin et al.
patent: 4689485 (1987-08-01), McMurtry
patent: 4694690 (1987-09-01), Jones et al.
patent: 4740688 (1988-04-01), Edwards

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