Fiber optic interferometric position sensor and measurement method thereof
US7532329B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2007 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | Jul 11, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B2290/45
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fiber optic interferometric position sensor and measurement method thereof suitable for determining the moving direction of a measurement object in an environment of high electric or magnetic field strengths are disclosed. The fiber optic interferometric position sensor comprises at least one light source, a plurality of fiber optic couplers, a plurality of sensing fibers and a plurality of photodetectors. The fiber optic couplers are connected to the at least one light source, the photodetectors, and the sensing fibers, respectively. The measurement method comprises: providing a fiber optic interferometric position sensor and a measurement object, obtaining two initial signals having a 90-degree phase difference therebetween, obtaining two measured signals, correcting the measured signals by a bias correction method, obtaining the phase value from the two measured signals by an electronic interpolation technique, and obtaining the position of the measurement object after computation by using the phase value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.