Lasers, Fiber Optics, and Communications

Silicone rubber-coated highly sensitive optical fiber sensor for temperature measurement

[+] Author Affiliations
Vanita Bhardwaj, Rahul Kumar Gangwar, Vinod Kumar Singh

Indian Institute of Technology (Indian School of Mines), Department of Applied Physics, Fiber Optics Laboratory, Dhanbad, Jharkhand 826004, India

Opt. Eng. 55(12), 126107 (Dec 21, 2016). doi:10.1117/1.OE.55.12.126107
History: Received October 17, 2016; Accepted November 28, 2016
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Abstract.  A silicone rubber-coated Mach–Zehnder interferometer (MZI) is proposed and applied to temperature measurement. The MZI is fabricated by splicing single mode fiber between a short section of no-core fiber (NCF) and the ultra-abrupt taper region. The sensing length of MZI is coated with liquid silicone rubber to enhance the temperature sensitivity. Here, NCF is used to excite the higher order cladding mode, the ultra-abrupt taper region acts as a optical fiber coupler, and the silicone rubber coating on sensing length is used as solid cladding material instead of liquid. The enhancement of the sensitivity of a device is due to the high refractive index (1.42) and thermo-optic coefficient (1.4×104/°C) of silicone rubber as compared to liquid cladding temperature sensors. The experiment was performed for both coated and uncoated MZI and the results were compared. The MZI exhibits a high temperature sensitivity of 253.75 and 121.26  pm/°C for coated and uncoated sensing probes, respectively, in the temperature range from 30°C to 75°C.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Vanita Bhardwaj ; Rahul Kumar Gangwar and Vinod Kumar Singh
"Silicone rubber-coated highly sensitive optical fiber sensor for temperature measurement", Opt. Eng. 55(12), 126107 (Dec 21, 2016). ; http://dx.doi.org/10.1117/1.OE.55.12.126107


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