Optical path sensor including a filter

Details Optical path sensor including a filter Optical path sensor including a filter

1986-12-03

1988-10-11

Arnold, Bruce Y.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350 9619, 35016217, 356395, G02B 2744, G02B 2602

Patent

active

047766697

ABSTRACT:
An optical path sensor including a filter through which passes a radiation beam comprising light of at least two wavelengths and which filter, as it is moved perpendicularly to the direction of the optical radiation beam, causes the attenuations for the beam components of different wavelengths to change in a different ratio. In a filter constructed in a simple manner with low-cost elements two phase gratings are arranged one after the other in the beam direction, only one of the gratings being movable perpendicularly to the beam direction and in that the zero-order diffraction beams are directed towards a detector.

REFERENCES:
patent: 3482107 (1969-12-01), Hock
patent: 3586665 (1971-06-01), Weyrauch
patent: 4051367 (1977-09-01), Sayce et al.
patent: 4091281 (1978-05-01), Willhelm et al.
patent: 4585307 (1986-04-01), Dammann et al.
patent: 4649351 (1987-03-01), Veldkamp et al.
patent: 4679901 (1987-07-01), Dammann et al.

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