Research on Temperature Sensing Characteristics Based on Capillary Tube Electroplating Encapsulation Structure of Fiber Bragg Grating
Encapsulation of fiber Bragg grating(FBG)with capillary tube has the effect of protection and temperature sensitiza-tion.The epoxy glue is usually used to connect the FBG and the capillary tube,which can affect the sensitivity and reliability of the sensor.Therefore,a capillary tube encapsulation process based on the combination of magnetron sputtering and electroplating was proposed.Firstly,a nickel metal conductive layer was sputtered on the bare FBG by magnetron sputtering,and then the two ends of the capillary steel tube were fixedly connected with the optical fiber by an electroplating process.The surface of the electroplated connecting layer is smooth and has no obvious defects.Electroplated encapsulation FBG temperature sensor has excellent linearity o-ver the full temperature range compared to glued encapsulation at 25℃to 95℃.The temperature sensing sensitivity of the encap-sulation structure is 2.63 times that of the bare FBG.The results show that the electroplated encapsulation structure of capillary tube not only improves the sensitivity of temperature sensing,but also has stable sensing performance at high temperature.
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