Rotation quantity measuring method and system

Details Rotation quantity measuring method and system Rotation quantity measuring method and system

1989-08-23

1991-01-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, 250237G, G01D 534

Patent

active

049872990

ABSTRACT:
A rotation quantity measuring method and system measures a rotation quantity of an object body. The rotation quantity is measured by irradiating a light from a light source on a grating pattern which is formed on a peripheral surface of a cylindrical body which rotates integrally with the object body, and detecting a shadow picture pattern which is generated by a reflected light received from the grating pattern based on a diffraction caused by the grating pattern. Then, the rotation quantity of the object body is measured based on a movement of the shadow picture pattern as the object body rotates.

REFERENCES:
patent: 3627069 (1971-12-01), Ray
patent: 4201911 (1980-05-01), Dering
patent: 4634861 (1987-06-01), Ching et al.
patent: 4733071 (1988-03-01), Tokunaga
patent: 4751383 (1988-06-01), Ueyama
patent: 4874941 (1989-10-01), Spillman, Jr.

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