Optical shaft angular and torsional displacement and speed sensi

Details Optical shaft angular and torsional displacement and speed sensi Optical shaft angular and torsional displacement and speed sensi

1988-06-03

1989-10-17

Willis, Davis L.

Optics: measuring and testing

By polarized light examination

250225, G01B 1126

Patent

active

048742457

ABSTRACT:
A displacement detector provides a light beam which impinges on an article with different combinations of light altering materials such as reflecting and non-reflecting surfaces, wave retarding plates, and linear polarizers attached to the article to determine angular position, relative angular displacement, and speed of rotatably mounted articles. These beam altering materials change either the polarization state or the magnitude of the light in a predictable manner. When used on different ends of a rotating shaft, the shaft speed and torsional displacement of the front shaft end with respect to the rear shaft end can be determined. When used with an article such as a rotatably mounted throttle, the angular displacement of the throttle can be determined.

REFERENCES:
patent: 2313923 (1943-03-01), Chubb
patent: 3474255 (1969-10-01), White
patent: 3584959 (1971-06-01), Del Carlo et al.
patent: 3604811 (1971-09-01), McMenamin
patent: 3938890 (1976-02-01), Flavell

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