Self-calibrating position transducer system and method

Details Self-calibrating position transducer system and method Self-calibrating position transducer system and method

1998-04-03

2000-02-29

Fulton, Christopher W.

Geometrical instruments

Distance measuring

Scale reading position sensor

33708, 324601, G01B 714, G01R 3500

Patent

active

060293632

ABSTRACT:
A self-calibrating position transducer system and method uses the position transducer itself as a position reference during calibration, thus eliminating using an external reference during calibration. The transducer signals are sampled at a plurality of evenly-spaced positions within each sampled scale wavelength, using the transducer itself as a position reference. The calibration values for the DC signal offsets, the amplitudes and non-orthogonality of the fundamental signals, the amplitudes of the signal harmonic components and position offsets are then determined using Fourier analysis techniques. The transducer signals are corrected using the determined calibration values, which are in turn used to revise the stored calibration values in anticipation of the next calibration operation. The self-calibrating position transducer uses the stored calibration values to enhance its accuracy.

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