High-Sensitivity Loop-Fiber Temperature Sensor Based on Distilled Water Cladding

Ronghua Fan; Lianqin Li; Chengcheng Wang; Zhaofeng Du; Junwen Wang; Xiang Lv; Zhijun Ren; Baojin Peng

doi:10.1109/JPHOT.2019.2943643

IEEE Photonics Journal (Jan 2019)

High-Sensitivity Loop-Fiber Temperature Sensor Based on Distilled Water Cladding

Ronghua Fan,
Lianqin Li,
Chengcheng Wang,
Zhaofeng Du,
Junwen Wang,
Xiang Lv,
Zhijun Ren,
Baojin Peng

Affiliations

Ronghua Fan: ORCiD; Department of Physics and Electronic Engineering, Zhejiang Normal University, Jinhua, China
Lianqin Li: Department of Physics and Electronic Engineering, Zhejiang Normal University, Jinhua, China
Chengcheng Wang: Department of Physics and Electronic Engineering, Zhejiang Normal University, Jinhua, China
Zhaofeng Du: Department of Physics and Electronic Engineering, Zhejiang Normal University, Jinhua, China
Junwen Wang: Department of Physics and Electronic Engineering, Zhejiang Normal University, Jinhua, China
Xiang Lv: Department of Physics and Electronic Engineering, Zhejiang Normal University, Jinhua, China
Zhijun Ren: ORCiD; Department of Physics and Electronic Engineering, Zhejiang Normal University, Jinhua, China
Baojin Peng: ORCiD; Department of Physics and Electronic Engineering, Zhejiang Normal University, Jinhua, China

DOI: https://doi.org/10.1109/JPHOT.2019.2943643
Journal volume & issue: Vol. 11, no. 5
pp. 1 – 11

Abstract

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The study proposed a temperature sensor based on distilled water cladding of the coupling region in the loop-fiber coupler, which was formed by folding a single-mode fiber, melting the taper region with an H2 flame, and using two adjacent fibers to obtain the interference in the coupling. Based on thermo-optical effect response and coupling interference principle, with increasing ambient temperature, the refractive index of the distilled water decreased, and the interference spectrum drifted. The experiment explored the relationship between different lengths of taper region and interference spectrum. When the taper region length was 30-35 mm, the interference spectrum improved. Results showed that the maximum sensitivity of the sensor was 151.35 pm/°C and linearity reached 99.99% when the temperature was within the range of 35 °C to 60 °C. Furthermore, we propose a low-cost demodulation scheme. The sensor had high sensitivity, good linearity, good stability, fast response, simple manufacturing process, and low cost. It has potential application value.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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