Index grating having partial fields that are geometrically offse

Details Index grating having partial fields that are geometrically offse Index grating having partial fields that are geometrically offse

1996-03-04

1997-10-21

Fulton, Christopher W.

Geometrical instruments

Distance measuring

Scale reading position sensor

356374, G01B 1102

Patent

active

056783191

ABSTRACT:
A linear or angular measuring system in which diffracted partial light beams are generated by way of partial fields which are offset with respect to each other, of which only the partial light beams of the resultant zero diffraction order are employed for signal formation. The partial light beams generated in this way are guided by direction selecting means to detectors assigned to them and converted into signals.

REFERENCES:
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patent: 4461083 (1984-07-01), Ernst
patent: 4519709 (1985-05-01), Nelle
patent: 5260769 (1993-11-01), Ieki et al.
patent: 5404226 (1995-04-01), Kellner
patent: 5456021 (1995-10-01), Nelle et al.
patent: 5553390 (1996-09-01), Ernst et al.
patent: 5576537 (1996-11-01), Holzapfel
patent: 5583798 (1996-12-01), Franz et al.
Willhelm, J., dissertation entitled "Dreigitterschrittgeber Photoelektrische Aufnehmer Zur Messung Von Lageanderungen," published Jun. 23, 1941.

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