DC Shift error correction for electro-optical measuring system

Details DC Shift error correction for electro-optical measuring system DC Shift error correction for electro-optical measuring system

1979-12-14

1982-03-09

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With light attenuation

33125C, 250237G, G01B 1114

Patent

active

043186173

ABSTRACT:
In an electro-optical measuring system which utilizes a sin/cos signal pair to determine the extent and direction of physical displacement, measurement errors often occurring as a result of extraneous DC level shifts in generated signals are corrected in a procedure which regularly samples the maxima and minima of the signals, derives from those values the median DC levels of the signals, compares the median levels to a reference DC level in the system to determine any differences, and applies any detected differences as corrective factors to position measurement signal values.

REFERENCES:
patent: 4180704 (1979-12-01), Pettit

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