Analog position encoder

Details Analog position encoder Analog position encoder

2006-08-15

2006-08-15

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Optical

C341S002000, C250S231180

Reexamination Certificate

active

07091884

ABSTRACT:
A position-measuring circuit is described for use with an analog position encoder of the kind comprising a code member and at least two sensors for sensing successive marks on the code member during relative movement between the code member and sensors, the sensors providing two oscillating quadrature signals. The circuit comprising means for obtaining a relatively coarse measure of position by detecting successive instants t0–t3at which the amplitudes of the sensor signals are equal or at which the amplitude of one signal is equal to the inverse of the amplitude of the other signal. The amplitude of one of the signals or its inverse is stored at each detection instant to alternately establish relatively high and low threshold levels. A fine measure of position at an arbitrary instant T is obtained as a function of the instantaneous amplitude P of one of the signals and the difference between neighbouring high and low thresholds levels.

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