Self-calibration detection device and temperature demodulation method oriented to fiber Raman temperature sensing system

US11927491B2 · kind B2 · utility

Assignee

• TAIYUAN UNIVERSITY OF TECHNOLOGY · CN

Inventors

• Mingjiang Zhang · Taiyuan, CN
• Jian Li · Fremont, US
• Jianzhong Zhang · Plano, US
• Lijun Qiao · Changchun, CN
• Baoqiang Yan · Taiyuan, CN
• Yang Xu · Wenhe, CN
• Baoquan Jin · Taiyuan, CN
• Dong Wang · Shanghai, CN
• Yu Wang · Redmond, US
• Yuncai Wang · Taiyuan, CN

Key dates

• Filing date: May 5, 2019
• Grant date: Mar 12, 2024
• Expiry date: Mar 17, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G01K15/007
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A self-calibration detection device and a temperature demodulation method oriented to a fiber Raman temperature sensing system. The self-calibration detection device comprises a fiber Raman thermodetector, thermostatic baths, a multi-mode sensing fiber, and a multi-mode reflector. The fiber Raman thermodetector comprises a pulsed laser whose output end is connected to the input end of a WDM. Two output ends of the WDM are respectively connected to input ends of a first and second APDs. Output ends of the first and second APDs are respectively connected to input ends of a first and second LNAs. Output ends of the first and second LNAs are connected to the input end of a data acquisition card whose output end is connected with the input end of a computer. The temperature demodulation method can solve the problems of low temperature measuring accuracy, lower temperature measurement stability and low temperature measurement efficiency.