Self-calibrating position transducer system and method
US6029363A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1998 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Apr 3, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2449
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.