A grapefruit microstructure fiber temperature sensor coated with liquid crystal based on waist-enlarged taper

Abstract

In this paper, a grapefruit microstructure fiber (GMF) temperature sensor coated with liquid crystal (LC) based on waist-enlarged taper is proposed and fabricated, and its temperature sensing characteristics are analyzed. The waist-enlarged taper is formed at the fusion point between single mode fiber (SMF) and GMF. The capillary glass tube is sleeved outside GMF, LC is filled into the capillary glass tube, and its two ends are finally sealed to form a sensor. The experimental results show that when the length of GMF is 2.5 cm, the temperature sensitivity of the sensor can reach up to 195.3 pm/°C in the range of 30–90 °C, and it has a good stability for reuse. Thereby, it can be used in biochemical, industrial production and other temperature detection areas.

References

[[1]] Guo J Q, Zhou M, Lu Y L, et al.. A temperature-insensitive polarization filter and a neotype sensor based on a hybrid-circular-hole microstructured optical fiber[J]. Optoelectronics letters, 2018, 14(4): 280-285,

[[2]] Mccary K M, Wilson B A, Birri A, et al.. Response of distributed fiber optic temperature sensors to high-temperature step transients[J]. IEEE sensors journal, 2018, 18(21): 8755-8761,

[[3]] Liu S H, Zhang H L, Li T L, et al.. Liquid core fiber interferometer for simultaneous measurement of refractive index and temperature[J]. IEEE photonics technology letters, 2019, 31(2): 189-192,

[[4]] Lin Q J, Zhao N, Yao K, et al.. Ordinary optical fiber sensor for ultra-high temperature measurement based on infrared radiation[J]. Sensors, 2018, 18(11): 4071,

[[5]] Morais J R W F, Giraldi M T M R. Comparative performance analysis of relative humidity sensor based on intermodal interference using tapered square no-core optical fiber and tapered cylindrical optical fiber[J]. Optical and quantum electronics, 2019, 51(9): 288,

[[6]] Wang S Y, Ma Y W, Li X A, et al.. Highly sensitive torsion sensor based on triangular-prism-shaped long-period fiber gratings[J]. Chinese optics letters, 2021, 19(4): 041202,

[[7]] Lv L, Ren G J, Liu B, et al.. Temperature influence on propagation characteristics of liquid crystal photonic crystal fiber of terahertz wave[J]. Journal of optoelectronics and advanced materials, 2011, 13(7): 755-759

[[8]] Huang Y J, Wang Y, Mao C, et al.. Liquid-crystal-filled side-hole fiber for high-sensitivity temperature and electric filed measurement[J]. Micromachines, 2019, 10(11): 761,

[[9]] Hu J Y, Zhou D, Su Y M, et al.. Fiber micro-tip temperature sensor based on cholesteric liquid crystal[J]. Optics letters, 2020, 45(18): 5209-5212,

[[10]] Lin W H, Zhou S J, Liu Y B, et al.. Liquid crystal-embedded hollow core fiber temperature sensor in fiber ring laser[J]. Applied sciences, 2021, 11(15): 7103,

[[11]] Fu X H, Li D S, Zhang Y X, et al.. High sensitivity refractive index sensor based on cascaded core-offset splicing NCF-HCF-NCF structure[J]. Optical fiber technology, 2022, 68: 102791,

[[12]] Oliveira R, Osorio J H, Aristides S, et al.. Simultaneous measurement of strain, temperature and refractive index based on multimode interference, fiber tapering and fiber Bragg gratings[J]. Measurement science and technology, 2016, 27(7): 075107,

[[13]] Liu H, Tan C, Zhu C H, et al.. Multi-parameters measurement based on cascaded Bragg gratings in magnetic fluid-infiltrated photonic crystal fibre[J]. Journal of modern optics, 2017, 64(8): 887-894,

[[14]] Cao X B, Tian D D, Liu Y Q, et al.. Sensing characteristics of helical long-period gratings written in the double-clad fiber by CO₂ laser[J]. IEEE sensor journal, 2018, 18(8): 7481-7485,

[[15]] Li C, Ning T G, Li J, et al.. Simultaneous measurement of refractive index, strain, and temperature based on a four-core fiber combined with a fiber Bragg grating[J]. Optics & laser technology, 2017, 90: 179-184,