Fiber Optic Temperature Sensor With Online Controllable Sensitivity Based on Vernier Effect

被引：27

作者：

Dai, Maolin ^{[1
,2
]}

Chen, Zhenmin ^{[1
,2
,3
]}

Zhao, Yuanfang ^{[1
,2
]}

Mu, Xin ^{[1
,2
]}

Liu, Xuanyi ^{[1
,2
]}

Gandhi, M. S. Aruna ^{[4
]}

Li, Qian ^{[4
]}

Lu, Shengzhen ^{[5
]}

Liu, Shen ^{[5
]}

Fu, H. Y. ^{[1
,2
,6
]}

机构：

[1] Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Shenzhen 518055, Peoples R China

[2] Tsinghua Univ, Tsinghua Berkeley Shenzhen Inst, Shenzhen 518055, Peoples R China

[3] Peng Cheng Lab PCL, Shenzhen 518055, Peoples R China

[4] Peking Univ, Sch Elect & Comp Engn, Shenzhen 518055, Peoples R China

[5] Shenzhen Univ, Coll Phys & Optoelect Engn, Guangdong & Hong Kong Joint Res Ctr Opt Fibre Sen, Shenzhen 518060, Peoples R China

[6] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519000, Peoples R China

来源：

IEEE SENSORS JOURNAL | 2021年 / 21卷 / 19期

关键词：

Temperature sensors; Sensors; Sensitivity; Optical fiber sensors; Optical interferometry; Optical fiber polarization; Sagnac interferometers; temperature sensors; Fabry-Perot interferometer; Lyot filter; Vernier effect; FABRY-PEROT-INTERFEROMETER; SAGNAC LOOP; CAVITY;

D O I：

10.1109/JSEN.2021.3101572

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A highly-sensitive temperature sensor with controllable sensitivity based on Vernier effect by cascading a tunable extrinsic Fabry-Perot interferometer (FPI) and a fixed reflective Lyot filter (RLF) is theoretically investigated and experimentally demonstrated. The temperature sensitivity can be tuned by modulating the cavity length of the extrinsic FPI and online monitoring the envelope of superimposed spectrum with optical spectrum analyzer (OSA). The FPI works as the reference arm to tune the temperature sensitivity of the sensing system, while the RLF with 1-meter polarization maintaining fiber (PMF) acts as the sensing probe. Experimental results prove that by changing the cavity length of the FPI, the sensitivities of -3.82 nm/degrees C, -8.33 nm/degrees C and -14.63 nm/degrees C can be achieved. Compared with the single sensing element, the sensitivities are magnified by 3.78, 8.25 and 14.49 times. The proposed temperature sensor is feasible to be applied practically in scenarios which require different temperature sensitivities in demanded temperature detection ranges.

引用

页码：21555 / 21563

页数：9

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