超短FBG的高灵敏度温度传感器

High sensitivity temperature sensor of ultra-short FBG

为了研究一种适用于人造卫星环境温度监测的高灵敏度温度传感器,利用超短光纤光栅的小尺寸优点并结合双金属增敏结构研究设计小尺寸高灵敏度温度传感器。采用1 mm超短光纤光栅作为测量敏感元件,以热膨胀系数大的铝材作为基底、热膨胀系数小的殷钢为热应变传递梁,将30 mm的铝材基底热应变转化为1 mm超短光纤光栅上的弹性应变,达到高效的温度增敏效果,实现了高灵敏度的温度测量。经测试,高灵敏度温度传感器的温度灵敏度系数为292.59 pm/℃,分辨率优于0.004℃,线性度为99.93%。该传感器可用于温度的精确测量,具有尺寸小和分辨率高等优点。

To study a high-sensitivity temperature sensor suitable for artificial satellite fiber grating,the ultra-short fiber grating is used in the small size and high sensitivity temperature sensor with the bimetal sensitizing structure.The 1mm ultra-short fiber grating is used as the measurement sensitive element,the aluminum with a large thermal expansion coefficient is used as the substrate,and the invar with a small thermal expansion coefficient is used as the thermal strain transmission beam.The thermal strain of the 30 mm aluminum substrate is converted into the 1mm ultra-short fiber grating.Elastic strain achieves a high-efficiency temperature sensitization effect and realizes high-sensitivity temperature measurement.After testing,the temperature sensitivity coefficient of the high-sensitivity temperature sensor is 292.59 pm/℃,the resolution is better than 0.004℃,the linearity is 99.93%.The sensor can be used for accurate temperature measurement and has the advantages of small size and high resolution.