Method of generating an index signal for an optical encoder

Details Method of generating an index signal for an optical encoder Method of generating an index signal for an optical encoder

2006-07-11

2006-07-11

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S559100

Reexamination Certificate

active

07075057

ABSTRACT:
A processing apparatus calculates and applies calibrations to sensors that produce quasi-sinusoidal, quadrature signals, using fixed or programmable electronic circuits, a circuit to calculate the phase and magnitude corresponding to the two input (quadrature) signals, and a circuit for accumulating the number of cycles of the input signals. The apparatus also includes a circuit to generate Gain, Offset, and Phase calibration coefficients by comparing a phase space position of a measured phasor with the position of an idealized phasor whose locus in phase space is a circle of predetermined radius with no offset. The calculation of the coefficients occurs without user intervention, according to a pre-programmed rule or rules. The apparatus also includes a circuit to apply the Gain, Offset, and Phase calibration coefficients to the measured quadrature signals xi and yi according to predetermined formulae using scaling coefficients, offset coefficients and a phase coefficient.

REFERENCES:
patent: 4360730 (1982-11-01), Breslow
patent: 4410798 (1983-10-01), Breslow
patent: 4575581 (1986-03-01), Langsberg
patent: 4772872 (1988-09-01), Villani
patent: 4873655 (1989-10-01), Kondraske
patent: 5138564 (1992-08-01), de Jong et al.
patent: 5241173 (1993-08-01), Howley et al.
patent: 5998783 (1999-12-01), Stridsberg
patent: 6029363 (2000-02-01), Masreliez et al.
patent: 6487787 (2002-12-01), Nahum et al.
patent: 0 328 683 (1988-08-01), None

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