Encoder scale error compensation employing comparison among...

Details Encoder scale error compensation employing comparison among... Encoder scale error compensation employing comparison among...

2006-10-24

2006-10-24

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231160, C250S23700G, C356S614000

Reexamination Certificate

active

07126109

ABSTRACT:
An encoder calculates position error values and applies compensation values to encoder position measurements in-situ. The encoder includes a scale and a multi-section detector for detecting a spatially periodic pattern, such as an optical interference pattern, produced by the scale. The detector includes spatially separated first and second sections. A signal processor estimates respective phase values from detector sections and calculates a phase difference reflecting a spatial position error in the scale. A compensation value is calculated from the phase difference and included in the estimate of the scale position to compensate for this spatial position error. The compensation values may be calculated and used on the fly, or calculated and saved during an in-situ calibration operation and then utilized during normal operation to compensate uncorrected measurements.

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patent: WO 03/055077 (2003-07-01), None

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