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Vol. 34, No. 8(3), S&M3042

Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
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Improvement of Temperature Sensitivity of Long-period Fiber Gratings Using Liquids with High Thermo-optic Coefficients [PDF]

Tsukasa Kanno, Osanori Koyama, Kanami Ikeda, and Makoto Yamada

(Received October 27, 2023; Accepted December 26, 2023)

Keywords: LPFG, temperature sensor, packaging, thermo-optic coefficients

To realize a highly sensitive glass-capillary-encapsulated long-period fiber grating (LPFG) sensor, we propose filling the capillary with a liquid-phase material, which was not proposed previously. It was found theoretically that high sensitivity can be achieved by using a liquid-phase filler with a thermal conductivity of 0.1 W/(m ‧ K) or more, large negative thermo-optic coefficient (TOC), and a refractive index of 1.46 (optical fiber cladding refractive index) or less. On the basis of theoretical results, ethanol, ethylene glycol, silicone oil #TSF-431, and silicone oil #TSF-451 were selected as liquid-phase fillers in this study. The shift of the resonance wavelength spectrum with respect to the unit temperature was used as the temperature sensitivity. The temperature sensitivity was determined to be 75.5 pm/℃ when LPFG was filled with ethanol, 70.0 pm/℃ when filled with ethylene glycol, 84.8 pm/℃ when filled with silicone oil #TSF-431, and 86.8 pm/℃ when filled with silicone oil #TSF-451. The use of liquid fillers with high thermal conductivity, a refractive index close to 1.46, and high TOC can significantly improve the temperature sensitivity compared with the case without fillers. It was also experimentally confirmed that high sensitivity is possible. Furthermore, a capillary-encapsulated LPFG sensor with a temperature sensitivity of 83.3 pm/℃ was realized us

Corresponding author: Makoto Yamada




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