Photoelectric position indicator with a light-directing phase gr

Details Photoelectric position indicator with a light-directing phase gr Photoelectric position indicator with a light-directing phase gr

1994-01-18

1995-09-12

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356363, 250237G, G01B 1102

Patent

active

054501997

ABSTRACT:
A photoelectric position indicator comprises a scale phase grating, and a scanning unit movable along a measuring direction and comprising a scanning phase grating, which is movable relative to the scale phase grating, a light source, a collimator, and photodetectors, which from the interference patterns formed by the light diffracted by the gratings receive groups having a predetermined order of diffraction and produce periodic phase-displaced actual-value signals in dependence on the orders of diffraction of said groups during a movement of the scanning unit relative to the scale phase grating. To ensure a generation of signals which can easily be evaluated and to permit larger assembling tolerances, the scanning unit comprises a light-directing phase grating arranged to fan the light from the light source transverse to the measuring direction so as to form component light beams, and the photodetectors receive the groups of the interference patterns generated by one of the component light beams.

REFERENCES:
patent: 2886718 (1959-05-01), Shepherd et al.
patent: 4049965 (1977-09-01), Pettigrew
patent: 4091281 (1978-05-01), Willhelm et al.
patent: 4231662 (1980-11-01), Feinland et al.
patent: 5000572 (1991-03-01), Nose et al.
patent: 5064290 (1991-12-01), McMurtry et al.
patent: 5066129 (1991-11-01), Matsui
patent: 5264915 (1993-11-01), Huber et al.

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