A Multiparameter Sensor Based on Dumbbell-Shaped Double-Cladding Fiber Structure Cascaded Long Period Fiber Grating
A Multiparameter Sensor Based on Dumbbell-Shaped Double-Cladding Fiber Structure Cascaded Long Period Fiber Grating
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DOI：
10.1109/jsen.2022.3181677
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发表时间：
2022-07-15
影响因子：
4.3
通讯作者：
Bi, Weihong
中科院分区：
文献类型：
--
作者：
Fu, Xinghu;Zhou, Jiahao;Bi, Weihong
提出并研制了一种基于哑铃型双包层光纤（DCF）结构级联长周期光纤光栅（LPFG）的多参量传感器。它是由单模光纤（SMF）和DCF之间放电形成一个腰大的锥形，然后级联两个长周期光纤光栅形成的。当光纤受到热膨胀效应、热光效应和弹光效应的影响时，模间干涉形成的谐振峰会发生位移，不同的谐振峰产生的位移也不同。通过解调三个共振峰的波长偏移，利用系数灵敏度矩阵可以测量温度、折射率和轴向应变。实验结果表明，在25 ℃与80 ℃相近的温度范围内，三个共振峰的温度灵敏度分别为14.79pm/℃、69.07pm/℃和89.83pm/℃三个共振峰的折射率灵敏度分别为14.27 nm/RIU、-71.39 nm/RIU和-141.07 nm/RIU，在1.3355和1.3715的范围内变化。在75 μ m ~ 525 μ m范围内，三个共振峰的轴向应变灵敏度分别为-2.26pm/μ m、-2.5pm/μ m和-3.14pm/μ m。相应的分辨率分别为0.6905 ℃、0.00054RIU和36.323 μ m。该传感器结构简单，线性度好。可广泛应用于各种参数的环境监测。
A multi-parameter sensor based on dumbbell-shaped double-cladding fiber (DCF) structure cascaded long period fiber grating (LPFG) is proposed and fabricated. It is formed by discharging between single mode fiber (SMF) and DCF to form a waist-enlarged taper and then cascading two LPFGs. When the fiber is affected by the thermal expansion effect, thermo-optic effect and elasto-optic effect, the resonant peaks formed by inter-mode interference will shift, and the shifts generated by different resonant peaks are also different. By demodulating the wavelength shift of the three resonant peaks, the temperature, refractive index and axial strain can be measured by using the coefficient sensitivity matrix. The experimental results show that the temperature sensitivity of the three resonance peaks is 14.79 pm/degrees C, 69.07 pm/degrees C and 89.83 pm/degrees C in the range of 25 degrees C similar to 80 degrees C. The refractive index sensitivities of three resonance peaks are 14.27 nm/RIU, -71.39 nm/RIU and -141.07nm/RIU in the range of 1.3355 similar to 1.3715. The axial strain sensitivities of three resonance peaks are -2.26 pm/ mu epsilon , -2.5pm/ mu epsilon and -3.14 pm/ mu epsilon in the range of 75 mu epsilon similar to 525 mu epsilon . The corresponding resolutions are 0.6905 degrees C, 0.00054RIU and 36.323 mu epsilon , respectively. The sensor is simple and has good linearity. It can be widely used in environmental monitoring for different parameter.