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Simultaneous measurement of temperature and surrounding refractive index by superimposed coated long period fiber grating and fiber Bragg grating sensor based on mode barrier region
Optik ( IF 3.1 ) Pub Date : 2020-06-16 , DOI: 10.1016/j.ijleo.2020.165136
Bo Pang , Zhengtian Gu , Qiang Ling , Wenyu Wu , Yuan Zhou

In this paper, simultaneous measurement of temperature and surrounding refractive index (SRI) by the superimposed coated long period fiber grating and fiber Bragg grating (SCLBG) sensor based on mode barrier region (MBR) is proposed. The sensor makes use of the different characteristics between long period fiber grating (LPFG) and fiber Bragg grating (FBG) in response to temperature and SRI, which makes it very convenient to realize simultaneous measurement of temperature and SRI. In addition, the sensitivity of the sensor to SRI is further improved by selecting an appropriate overlay thickness within the range of MBR. The simulation results show that the temperature can be accurately measured by the resonant wavelength of FBG in SCLBG. The variation of the LPFG resonant wavelength in SCLBG is caused by both SRI and temperature, and the change caused by temperature is the same as that of FBG. Therefore, the change of LPFG resonant wavelength caused by temperature can be eliminated from the change of FBG resonant wavelength, and the accurate SRI change can be obtained. According to the analysis, the sensitivity of SCLBG to temperature and SRI can reach 10pm/℃ and 2326.7nm/RIU, respectively. The linearity of the measured temperature and SRI is up to 0.999, and SRI sensitivity is at least four times higher than reported superimposed LPFG and FBG sensors. Therefore, the sensor proposed in this paper has the characteristics of high sensitivity and high linearity, which is expected to be applied in the field of sensing.



中文翻译:

基于模式势垒区域的叠加涂层长周期光纤光栅和光纤布拉格光栅传感器同时测量温度和周围折射率

本文提出了一种基于模态势垒区(MBR)的涂覆式长周期光纤光栅和光纤布拉格光栅(SCLBG)传感器同时测量温度和周围折射率的方法。该传感器利用了长周期光纤光栅(LPFG)和光纤布拉格光栅(FBG)之间响应温度和SRI的不同特性,非常方便地实现温度和SRI的同时测量。此外,通过在MBR范围内选择合适的覆盖层厚度,可以进一步提高传感器对SRI的灵敏度。仿真结果表明,通过SCLBG中FBG的共振波长可以准确地测量温度。SCLBG中LPFG谐振波长的变化是由SRI和温度共同引起的,温度引起的变化与FBG相同。因此,可以从FBG谐振波长的变化中消除由温度引起的LPFG谐振波长的变化,并且可以获得准确的SRI变化。根据分析,SCLBG对温度和SRI的敏感度可以达到10pm /℃和2326.7 nm / RIU。测得的温度和SRI的线性度最高可达0.999,并且SRI灵敏度至少比报道的叠加LPFG和FBG传感器高四倍。因此,本文提出的传感器具有高灵敏度和高线性度的特点,有望应用于传感领域。

更新日期:2020-06-16
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