Integrated birefringent-biased pressure and temperature sensor system
US5561522A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1995 |
| Grant date | Oct 1, 1996 |
| Priority date | — |
| Expiry date | Mar 27, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/344
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An integrated optical temperature and pressure sensor system that is birefringently biased. A broad band light source is transmitted via a fiber optic cable having a splitter, a collimator and a polarizer to a first birefringent bias element. The first birefringent element has a partially reflective coating to reflect back a portion of the light signal to the first polarizer to yield a first reflective modulated light that consists of temperature information irrespective of external forces. The non-reflected light continues to a second birefringent bias element. The second birefringent crystal provides additional birefringent bias to the light wave before the light wave enters an isotropic pressure sensor media. An external pressure applied to the sensor causes the light to experience stress-induced birefringence. The sensor comprises a highly reflective surface which redirects the light back through the sensor, both bias crystals and the polarizer to yield a second reflective modulated light spectrum. The splitter which directs a combined light spectrum comprising a portion of each reflected light spectrum to an opto-electronic interface where the intensity vs. wavelength signal i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.