Birefringent optical temperature sensor and method
US7265847B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2006 |
| Grant date | Sep 4, 2007 |
| Priority date | — |
| Expiry date | Jan 18, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2005/583
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention concerns a tandem interferometer for temperature sensing. The low coherence interferometry (LCI) system comprises a polarization-based sensing interferometer comprising a birefringent crystal having a sensor temperature sensitivity and a birefringence dispersion, and a readout interferometer being either a Fizeau interferometer using an optical wedge or a polarization interferometer using a birefringent wedge. In one embodiment of the invention, the birefringent crystal has dispersion properties similar to that of the birefringent wedge or that of the optical wedge of the readout interferometer. The present invention also provides a signal processing method for correcting the dispersion effect and for noise filtering in LCI-based optical sensors of the tandem interferometer arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.