Apparatus and method for generating position-dependent signals u

Details Apparatus and method for generating position-dependent signals u Apparatus and method for generating position-dependent signals u

1995-02-23

1997-07-15

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023114, 356356, H01J 314, H01J 516, G01B 1102

Patent

active

056486588

ABSTRACT:
In this apparatus, which serves preferably to generate reference pulses, graduations are provided on the scanner plate (A), whose graduation period varies steadily as a function of location (chirped grating). The various graduation markings (GS) are embodied in turn as periodic phase gratings, whose graduation scores extend parallel to the measurement direction (X).

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