Apparatus for position encoding

Details Apparatus for position encoding Apparatus for position encoding

1982-02-05

1985-09-24

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356356, G01B 900

Patent

active

045429898

ABSTRACT:
A position encoder including a holographically recorded, single-frequency, phase grating. When this phase grating is illuminated by a spatially coherent light source, it acts as a basic common path interferometer and constitutes a highly efficient source of high contrast, stable, interference fringe patterns. In the position encoder, a carrier moves the grating in a plane that is orthogonal to an axis from the light source. Motion of the carrier is detected as the fringe pattern moves past detecting means thereby to sense motion and provide position information in the form of electrical signals.

REFERENCES:
patent: 3900264 (1975-08-01), Heitmann et al.
patent: 4025197 (1977-05-01), Thompson
patent: 4265534 (1981-05-01), Remijan
patent: 4395124 (1983-07-01), Remijan

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