Distributed optical fiber temperature sensor based on optical fiber delay

US8734011B2 · kind B2 · utility

Assignee

• University of Electronic Science and Technology of China · CN

Inventors

• Qi Qiu · Chapel Hill, US
• Jun Su · San Jose, US
• Shuangjin Shi · Chengdu, CN
• Yun-Chang Liao · Lo Wu, CN
• Caidong Xiong · Chengdu, CN

Key dates

• Filing date: May 6, 2012
• Grant date: May 27, 2014
• Expiry date: Jul 11, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01K11/32
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present invention discloses distributed optical fiber temperature sensor based on optical fiber delay technology, including a tunable optical transmitter module, an optical receiver module, a signal processing and controlling module and multiple distributed sensing modules connected in series via transmission fibers. The multiple wavelengths optical signals transmitted from the tunable optical transmitter module respectively are transmitted into the first sensing module, and then transmitted out from the last sensing module. The output multiple wavelengths optical signals arrive at the optical receiver module. The optical receiver module converts optical signals of all wavelengths into electrical signals and transmits them into the signal processing and controlling module. The signal processing and controlling module measures transmission delay time of optical signal of each wavelength respectively, and calculates and obtains the temperature parameters of corresponding distributed testing positions based on the relative delay time.