Differential displacement optical sensor

Details Differential displacement optical sensor Differential displacement optical sensor

1999-03-31

2000-02-01

Pham, Hoa Q.

Optics: measuring and testing

By polarized light examination

With light attenuation

356373, G01B 1100

Patent

active

060209674

ABSTRACT:
Positional sensors receive light that has been reflected off a pair of complementary geometric patterns carried by a supporting, displaceable carrier surface. The sensors view the patterns through viewing windows as the carrier surface is displaced laterally, presenting differing portions of the patterns to the sensors. The patterns are shaped to produce outputs which, when their difference value is extracted, provide output signals that are a measure of the displacement of the carrier surface and in which common mode errors are minimized.

REFERENCES:
patent: 5153472 (1992-10-01), Karidis et al.
patent: 5473156 (1995-12-01), Pinnock et al.
patent: 5666236 (1997-09-01), Bracken et al.
patent: 5691814 (1997-11-01), Strasser
patent: 5847528 (1998-12-01), Hui et al.

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