US 11,927,491 B2
Self-calibration detection device and temperature demodulation method oriented to fiber Raman temperature sensing system
Mingjiang Zhang, Taiyuan (CN); Jian Li, Taiyuan (CN); Jianzhong Zhang, Taiyuan (CN); Lijun Qiao, Taiyuan (CN); Baoqiang Yan, Taiyuan (CN); Yang Xu, Taiyuan (CN); Baoquan Jin, Taiyuan (CN); Dong Wang, Taiyuan (CN); Yu Wang, Taiyuan (CN); and Yuncai Wang, Taiyuan (CN)
Assigned to TAIYUAN UNIVERSITY OF TECHNOLOGY, Taiyuan (CN)
Appl. No. 17/252,992
Filed by TAIYUAN UNIVERSITY OF TECHNOLOGY, Taiyuan (CN)
PCT Filed May 5, 2019, PCT No. PCT/CN2019/000086
§ 371(c)(1), (2) Date Dec. 16, 2020,
PCT Pub. No. WO2020/010824, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 201810747173.8 (CN), filed on Jul. 9, 2018.
Prior Publication US 2021/0116311 A1, Apr. 22, 2021
Int. Cl. G01K 15/00 (2006.01); G01K 11/324 (2021.01)
CPC G01K 15/005 (2013.01) [G01K 11/324 (2021.01); G01K 15/007 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A self-calibration detection device oriented to a fiber Raman temperature sensing system, the self-calibration detection device comprising a fiber Raman thermodetector, thermostatic baths, a multi-mode sensing fiber, and a multi-mode fiber reflector;
wherein the fiber Raman thermodetector includes a pulsed laser, a wavelength division multiplexer (WDM), two avalanche photodiodes (APDs), two low-noise amplifiers (LNAs), a data acquisition card, and a computer;
wherein an output end of the pulsed laser is connected to an input end of the WDM; two output ends of the WDM are respectively connected to input ends of a first APD and a second APD; an output end of the first APD is connected to an input end of a first LNA; an output end of the second APD is connected to an input end of a second LNA; output ends of the first LNA and the second LNA are connected with input ends of the data acquisition card; and an output end of the data acquisition card is connected to an input end of the computer;
wherein an input end of the multi-mode sensing fiber is connected to a common end of the WDM, wherein a middle part of the multi-mode sensing fiber is respectively wound with a first reference fiber ring and a second reference fiber ring, and a rear part is used as a sensing fiber to be tested; the first reference fiber ring is placed in a first temperature bath, and the second reference fiber ring is placed in a second temperature bath; and wherein an output end of the sensing fiber to be tested is connected to the multi-mode fiber reflector.