Optical fiber multipoint measuring device with time multiplexing
US4861979A · kind A · utility
4Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1987 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Jun 1, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Twenty temperature sensors follow one another along a measurement fiber. Each successively reflects a small fraction of the energy of an interrogation light pulse running along said fiber, with the value of the fraction being indicative of temperature. To do this, each sensor is constitutred by a gap between two successive lengths (F2, F3) of an optical fiber, said gap being filled with a transparent glue (36) whose refractive index varies as a fuction of temperature. The interrogation pulse is returned solely by the optical surface constituted by the end face (38) of the upstream length (F2) of the fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.