Sensing system with fiber gas sensor

US7489835B1 · kind B1 · utility

Assignee

• General Electric Company · US

Inventors

• Hua Xia · Niskayuna, US
• Jeffrey Scott Goldmeer · Latham, US
• Kevin Thomas McCarthy · Troy, US
• Aditya Kumar · Austin, US
• Ravindra Annigeri · Roswell, US
• Ertan Yilmaz · Albany, US
• Avinash Vinayak Taware · Niskayuna, US
• Yu Zhao · 红钢城街道, CN

Key dates

• Filing date: Mar 28, 2008
• Grant date: Feb 10, 2009
• Expiry date: Mar 28, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2021/7776
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A fiber gas sensor includes a fiber core with first and second refractive index periodic modulated grating structures having different amplitude modulation profiles positioned about the fiber core. A fiber cladding is positioned about the first and second refractive index periodic modulated grating structures. A sensing layer is positioned about the fiber cladding of one of the refractive index periodic modulated grating structures. The sensing layer includes a sensing material made of a Pd-based alloy, such as nano-PdOx, nano-Pd(x)Au(y)Ni(1-x-y) or nano-Pd/Au/WOx. The fiber gas sensor provides a measurement of localized, temperature-corrected gas concentration and composition from a combustion environment. A reflection-based or a transmission-based sensing system with an array of one or more fiber gas sensors is also described.