Thermostatic fiber optic waveguides
US4373768A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1980 |
| Grant date | Feb 15, 1983 |
| Priority date | — |
| Expiry date | Mar 31, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Fiber optic waveguides exhibiting a blackout phenomenon can be used for temperature sensing. A temperature sensing waveguide can be used in such applications as maintaining a material within a selected temperature range, freeze protection, viscosity control of liquids in pipelines, leak detection of cryogenic fluids, fire detection, application of heat-recoverable materials, and fluid level detection. Novel waveguides exhibiting blackout at selected temperatures for use in these applications are described. Among the novel waveguides are those having a cladding comprising a polyalkylphenyl siloxane and those having a cladding comprising a cross-linked polymethylalkyl siloxane. Also described are waveguides where only a section of the waveguide exhibits blackout and methods for making such waveguides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.