Ratio detector

Details Ratio detector Ratio detector

1975-12-03

1977-07-19

Gruber, Felix D.

Registers

Coded record sensors

Particular sensor structure

23515053, 356 5, 356167, H03D 1300, G06J 100

Patent

active

040371611

ABSTRACT:
An electro-optical device for generating data signals representing relative displacement between an aperture pattern in a reference plane and a reflective pattern in a measurement plane comprises a reference detector for sensing reference radiation directed towards the aperture pattern and a convolution detector for sensing the reference radiation reflected by the reflective pattern. The phase of a signal generated by the convolution detector is compared to the phase of a signal generated by the reference detector for generating the data signals defining the relative displacement between the aperture pattern and the reflective pattern.

REFERENCES:
patent: 3551808 (1970-12-01), Grossimon
patent: 3657659 (1972-04-01), Johnson
patent: 3878381 (1975-04-01), Broder et al.
patent: 3891321 (1975-06-01), Hock
Moore: Digital Phase Angle Meter Control, IBM Technical Disclosure Bulletin, vol. 3, No. 2, July 1960.

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