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Temperature sensing characteristics of metal coated FBG during dynamic cooling process

机译：动态冷却过程中金属涂层FBG的温度感应特性

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摘要

Temperature sensitivity of bare Fiber Bragg Grating (FBG) is quite low when used as sensor in the cryogenic environments, which is due to the decrease of thermal expansion coefficient and thermo-optic coefficient of silica at cryogenic temperatures. Therefore, metals with high thermal expansion coefficients were used to protect bare FBGs and increase their cryogenic temperature sensitivities. Specifically, FBGs were firstly coated with a thin conducive nickel layer by chemical plating and then electroplated with nickel, copper, zinc and fin. Sensing characteristics of the bare FBG and metal coated FBGs during dynamic cooling process were systematically studied assisted by a temperature controlled stage with the resolution of 0.1 degrees C. Results show that (i) FBGs are well protected with the metal coatings; (ii) during dynamic cooling process, the curves of wavelength shift of the bare FBG and metal coated FBGs are both nonlinear; (iii) temperature sensitivities of Ni-coated FBG, Cu-coated FBG, Zn-coated FBG and Sn-coated FBG in the cryogenic environments are about 1.5 times, 2 times, 2.5 times and 3 times of that of the bare FBG, respectively; (iv) temperature sensitivities of FBGs decrease slightly with the increase of the cooling rates.
机译：当在低温环境中用作传感器时，裸光纤布拉格光栅（FBG）的温度敏感性非常低，这是由于低温时二氧化硅的热膨胀系数和热光系数降低了。因此，使用具有高热膨胀系数的金属来保护裸露的FBG，并提高其低温温度敏感性。具体地，首先通过化学镀在FBG上涂覆一层薄的导电镍层，然后再电镀镍，铜，锌和鳍。借助温度控制级，分辨率为0.1摄氏度的系统辅助系统研究了裸露的FBG和金属涂层的FBG在动态冷却过程中的传感特性。结果表明：（i）FBG被金属涂层很好地保护； （ii）在动态冷却过程中，裸露的FBG和涂有金属的FBG的波长变化曲线均为非线性； （iii）在低温环境下，镀镍的FBG，镀铜的FBG，镀锌的FBG和镀锡的FBG的温度敏感性分别约为裸FBG的1.5倍，2倍，2.5倍和3倍。 ; （iv）FBG的温度敏感性随冷却速率的增加而略有降低。

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