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低温环境下光纤位移传感器测试系统的实验研究
引用本文:杨晶磊,胡小方,伍小平.低温环境下光纤位移传感器测试系统的实验研究[J].实验力学,2002,17(1):55-61.
作者姓名:杨晶磊  胡小方  伍小平
作者单位:中国科学院中国科学技术大学,材料力学行为和设计重点实验室,合肥,230026
基金项目:国家自然科学基金资助项目 (19732 0 0 1和 19972 0 6 7)
摘    要:作者进行了光纤位移传感器在低温环境下的实验研究,分析了传感器的原理,测试了其室温、液氮温度下的静态传输特性,并进行了标定。实验时采取的参考光强度补偿的措施,消除了光源、光纤衰减等波动对测试结果的影响。利用本传感器系统测试了19芯纯Ag包套的高温超导带材Bi222在液氮温度下的应力-应变关系,以及应力-临界电流之间的关系,结果与理论分析相一致。实验结果表明,该传感器可以在液氮温度下正常工作,且具有测量范围大、测试精度高等优点,同时还克服了低温应变片仅能测试出复合材料基体或者包套应变的缺点。

关 键 词:低温  光纤位移传感器  强度补偿  静态传输特性  测试系统  复合材料
文章编号:1001-4888(2002)01-0055-07
修稿时间:2001年10月15

Experiments on Fiber Optic Displacement Sensor for Cryogenic Environment
YANG Jing-lei,HU Xiao-fang,WU Xiao-ping.Experiments on Fiber Optic Displacement Sensor for Cryogenic Environment[J].Journal of Experimental Mechanics,2002,17(1):55-61.
Authors:YANG Jing-lei  HU Xiao-fang  WU Xiao-ping
Abstract:Experiments on fiber optic displacement sensor (FODS) for cryogenic environment are presented. The principle of the FODS was analyzed, and its static transmission properties were measured at room temperature and liquid nitrogen temperature. The calibration of the FODS was given. Intensity error from the fluctuation of the light source and fiber attenuation are eliminated by intensity compensation. As an applied example, the strain-stress relationship and the stress-Jc (critical current density) relationship were measured and the results agreed well with the theory. The test results showed that the FODS could effectively work at liquid nitrogen temperature and had merits of large measurement range and high resolution.
Keywords:low temperature  fiber optic  displacement sensor  intensity compensation
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