Fiber optic pressure sensor with passive temperature compensation
US5844667A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1997 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | Jan 28, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/022
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A temperature compensated intrinsic optical fiber pressure sensing device includes an intrinsic fiber optic sensor formed in a core of an optical fiber. A diaphragm responsive to a pressure in an environment applies a longitudinal strain in the optical fiber, thereby inducing a pressure stress in the intrinsic fiber optic sensor. The intrinsic fiber optic sensor is responsive to an optical signal and to the pressure stress for providing a sensing light signal indicative of the pressure. A temperature compensation members are responsive to a temperature for applying a longitudinal strain in the optical fiber, thereby inducing a temperature compensation stress in the intrinsic fiber optic sensor indicative of the temperature, wherein changes in the sensing light signal that are attributable to changes in the temperature compensation strain substantially compensates for changes in the sensing light signal attributable to changes in the temperature of the intrinsic fiber optic sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.