基于双周期光纤光栅的温度/折射率双参量传感器
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摘要
提出一种对温度和折射率进行同时测量的双周期光纤光栅传感器。双周期光栅通过将长周期光栅和光纤Bragg光栅刻写到光纤同一位置而构成。利用两种光栅对温度和折射率的灵敏度差异,结合灵敏度系数矩阵实现了双参量测量。将所刻写的双周期光栅使用氢氟酸进行腐蚀,进一步增加了倏逝场强度,实验结果显示温度灵敏度为64.26pm/℃,折射率灵敏度可达-297.14nm/RIU。所设计的传感器在双参量测量场合和折射率高精度测量中具有良好的应用前景,同时具有体积小、灵敏度高的优点。
A dual-period grating sensor used for simultaneous measurement of temperature and refractive index(RI) is proposed. The dual-period grating is constructed by writing a long period grating(LPG) and a fiber Bragg grating(FBG) in the same position of the optical fiber. The simultaneous measurement is realized by using the sensitivity difference between the LPG and FBG. In addition, the dual-period grating is etched using hydrofluoric acid to increase the evanescent field. Experimental results show that the sensitivities of RI and temperature are 64.26 pm/℃ and-297.14 nm/RIU, respectively. The proposed sensor shows a good application prospect in the case of double-parameter measurement and high-precision measurement of RI, and also has the advantages of small size and high sensitivity.
A dual-period grating sensor used for simultaneous measurement of temperature and refractive index(RI) is proposed. The dual-period grating is constructed by writing a long period grating(LPG) and a fiber Bragg grating(FBG) in the same position of the optical fiber. The simultaneous measurement is realized by using the sensitivity difference between the LPG and FBG. In addition, the dual-period grating is etched using hydrofluoric acid to increase the evanescent field. Experimental results show that the sensitivities of RI and temperature are 64.26 pm/℃ and-297.14 nm/RIU, respectively. The proposed sensor shows a good application prospect in the case of double-parameter measurement and high-precision measurement of RI, and also has the advantages of small size and high sensitivity.
引文
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[4] Maeng S,Park J,Byungsung O,et al.Uncertainty improvement of geometrical thickness and refractive index measurement of a silicon wafer using a femtosecond pulse laser[J].Optics Express,2012,20(11):12184.
[5] Sun X,Dai D,Thylén Lars,et al.High-sensitivity liquid refractive-index sensor based on a Mach-Zehnder interferometer with a double-slot hybrid plasmonic waveguide[J].Optics Express,2015,23(20):25688.
[6] Wang Y P,Chen J P,Li X W,et al.Simultaneous measurement of various optical parameters in a multilayer optical waveguide by a Michelson precision reflectometer[J].Optics Letters,2005,30(9):979—981.
[7] Liao C R,Hu T Y,Wang D .Optical fiber Fabry-Perot interferometer cavity fabricated by femtosecond laser micromachining and fusion splicing for refractive index sensing[J].Optics Express,2012,20(20):22813.
[8] Huamin,Liang,Heini,et al.Surface plasmon resonance instrument as a refractometer for liquids and ultrathin films[J].Sensors & Actuators B Chemical,2010,149(1):212—220.
[9] Wang Y,Tan X,Jin W,et al.Temperature-controlled transformation in fiber types of fluid-filled photonic crystal fibers and applications[J].Optics Letters,2010,35(1):88—90.
[10] Liu J,Wang D N,Zhang L.Slightly tapered optical fiber with dual inner air-cavities for simultaneous refractive index and temperature measurement[J].Journal of Lightwave Technology,2016,43(21):4872—4879.
[11] Ben X,Yi Y,Zhenbao J,et al.Hybrid Fabry-Perot interferometer for simultaneous liquid refractive index and temperature measurement[J].Optics Express,2017,25(13):14483.
[12] Tong Z,Zhong Y,Wang,et al.Research on simultaneous measurement of refractive index and temperature comprising few mode fiber and spherical structure[J].Optics Communications,2018,421(15):1—6.
[13] Liu T,Chen Y,Han Q,et al.Sensor based on macrobent fiber Bragg grating structure for simultaneous measurement of refractive index and temperature[J].Applied Optics,2016,55(4):791.
[14] Zhou J,Wang Y,Liao C,et al.Intensity modulated refractive index sensor based on optical fiber Michelson interferometer[J].Sensors and Actuators B:Chemical,2015,208(8):315—319.
[15] Velzquezgonzlez J S ,Monznhernndez D ,Morenohernndez D ,et al.Simultaneous measurement of refractive index and temperature using a SPR-based fiber optic sensor[J].Sensors & Actuators B Chemical,2016,242(11):189—195.
[16] 王燕涛,姜凤贤,齐跃峰.基于级联光栅温度补偿的溶液浓度测量研究[J].光电工程,2015,42(5):63—67.Wang Yantao,Jiang Fengxian,Qi Yuefeng.Concentration measurement of temperature compensation with cascaded fiber grating[J].Opto-Electronic Engineering,2015,42(5):63—67.
[17] Marin E,Robert L,Sébastien Triollet,et al.Liquid Resin Infusion process monitoring with superimposed Fibre Bragg Grating sensor[J].Polymer Testing,2012,31(8):1045—1052.
[18] Sun A,Wu Z.Hybrid long-period-grating and fiber Bragg grating for cladding-mode-recoupling-based discrimination of temperature and strain[J].Optical Engineering,2012,51(4)044402.
[19] 何伟,徐先东,姜德生.聚合物封装的高灵敏度光纤光栅温度传感器及其低温特性[J].光学学报,2004,24(10):1316—1319.He Wei,Xu Xiandong,Jiang Desheng.High-sensitivity fiber bragg grating temperature sensor with polymer jacket and its low-temperature characteristic[J].Acta Optica,2004,24(10):1316—1319.
[20] Chen I,Lin S S,Lin T J,et al.Detection of hydrofluoric acid by a sio2 sol-gel coating fiber-optic probe based on reflection-based localized surface plasmon resonance[J].Sensors,2011,11(2):1907—1923.