Infiltrated hollow core fiber interferometer for high sensitive temperature and refractive index sensing

被引：3
作者：
Chen, Linjia [1 ]
Su, Qi [1 ]
Liu, Shuhui [1 ]
Li, Litong [2 ]
机构：
[1] Wuhan Inst Technol, Hubei Key Lab Opt Informat & Pattern Recognit, Wuhan 430205, Peoples R China
[2] Yangtze Opt Fiber & Cable Joint Stock Ltd Co, R&D Ctr, State Key Lab Opt Fiber & Cable Manufacture Techn, Wuhan 430073, Peoples R China
来源：
OPTIK | 2021年 / 243卷
基金：
中国国家自然科学基金;
关键词：
Multi-parameter sensor; Photonic crystal fiber; Long period grating; PHOTONIC-CRYSTAL-FIBER; MACH-ZEHNDER INTERFEROMETER; LONG-PERIOD GRATINGS; SELECTIVE INFILTRATION; FEMTOSECOND LASER; SENSOR; INTENSITY; STRAIN; WAVELENGTH; CAVITY;
D O I：
10.1016/j.ijleo.2021.167336
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A simple fiber sensor based on liquid infiltrated modal interferometer created in hollow core fiber is proposed and demonstrated for temperature and refractive index (RI) sensing with high sensitivities. The fiber sensor is constructed by splicing a section of hollow core fiber filled with high index liquids between single mode fibers. The infiltration of the liquids changes the transmission property of the hollow core fiber, and modal interference is introduced in such a section of fiber. Due to the high thermo-optic coefficient of the liquid, the sensor is highly sensitive to temperature change. The sensor exhibits different temperature sensitivities in different temperature ranges, and the highest sensitivity (-1.4 nm/degrees C) is obtained in the temperature range from 22 degrees C to 36 degrees C. The RI response of the sensor is also investigated, and the sensor exhibits a spectrum shift towards longer wavelength as the ambient liquid RI increases, and a highest sensitivity of 884 nm/RIU is achieved. The proposed sensor is simple and cost effective, and is promising to be developed for high accuracy temperature measurements in the fields of biomedical and chemical applications.
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页数：6
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