Fiber optic gas sensor
US7792392B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2007 |
| Grant date | Sep 7, 2010 |
| Priority date | — |
| Expiry date | May 29, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/7723
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas sensor includes an in-fiber resonant wavelength device provided in a fiber core at a first location. The fiber propagates a sensing light and a power light. A layer of a material is attached to the fiber at the first location. The material is able to absorb the gas at a temperature dependent gas absorption rate. The power light is used to heat the material and increases the gas absorption rate, thereby increasing sensor performance, especially at low temperatures. Further, a method is described of flash heating the gas sensor to absorb more of the gas, allowing the sensor to cool, thereby locking in the gas content of the sensor material, and taking the difference between the starting and ending resonant wavelengths as an indication of the concentration of the gas in the ambient atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.