埋入式光纤布拉格光栅传感器低温力学传感性能的基础实验研究
Basic experimental study on low temperature mechanical sensing performance of embedded fiber Bragg grating sensor
Received:August 23, 2021  Revised:October 14, 2021
DOI:10.7520/1001-4888-21-192
中文关键词:  应变测量  埋入式FBG传感器  YBCO
英文关键词:strain measurement  embedded FBG sensor  YBCO
基金项目:国家自然科学基金面上项目(12172357);国家自然科学基金重点项目(11932008);中国科学院青年创新促进会基金(2019404);中国科学院西部之光西部青年学者资助
Author NameAffiliation
ZHANG Pengnian Lanzhou Jiaotong University, School of Automation & Electrical Engineering, Lanzhou 730070, Gansu, China 
TENG Qingfang Lanzhou Jiaotong University, School of Automation & Electrical Engineering, Lanzhou 730070, Gansu, China 
GUAN Mingzhi* 1.Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
2.Lanzhou University, College of Civil Engineering and Mechanics, Lanzhou 730000, Gansu, China 
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中文摘要:
      在绕制、冷却和强磁场等极端运行条件下,高温超导磁体内部将会产生复杂的应力和应变,其内部最大应变可达到数千微应变,极易引起超导性能的退化,造成结构的破坏,因此,高温超导磁体结构内部的力学状态直接关系到运行的安全性和可靠性。而国内外针对高温超导磁体结构内部应变测量的技术尚处于初步研究阶段。基于光纤布拉格光栅(FBG)应变测量技术, 结合钇钡铜氧(YBCO)高温超导带材结构,本文提出了一种埋入式FBG传感测量技术,即利用低温粘接剂等特殊材料将FBG传感器封装至带材的一侧,且几乎不影响带材尺寸,待绕制成磁体结构后,FBG传感器自然地埋入至线圈层间,以测量结构内部的形变行为等。结合YBCO高温超导线圈固化材料及固化技术,研制了4种不同的埋入式FBG应变传感器,并对传感器进行了测试对比和精度分析,给出了相应的实验标定曲线,以探讨FBG传感器在制备过程中粘贴工艺、低温环境等对实验结果的影响。结果表明:在低温胶以及环氧树脂的正确封装和良好固化情况下,所研制的埋入式FBG传感器在室温和液氮温区下具有较高的测量精度,可应用于低温环境下双层超导带材结构内部的应变监测等;所研制的埋入与准分布式FBG传感器在低温环境下无明显的啁啾现象,具有较高的测量精度。
英文摘要:
      Complex stress and strain can arise from the winding, cooling down and intense field in YBCO superconducting magnets, which can induce maximum internal strain to about several thousand micro-strain in magnets and cause the degradation of superconducting performance and even damage easily the internal structure of superconducting magnets. Especially for high temperature superconductor, the internal stress state is related directly to its safety and reliability operation. The relevant measurement technology of internal strain in the ultra-low temperature is rarely involved at home and abroad. Based on fiber Bragg grating (FBG) strain measurement technology, it is proposed that an embedded FBG sensor measurement technology for YBCO high temperature superconducting taps, namely, FBG sensor is attached slightly to the surface of strip by adhesive and special crafts, whereas the size of tap is hardly influenced; then the FBG sensor is naturally embedded between the coil layers when winding. Furthermore, measurement precision of four kinds of FBGs based on the different preparation crafts were compared and analyzed. The corresponding experimental calibration curves were shown, and the effects of binder, bonding process and low temperature environment on the results were discussed. The results show that the developed embedded FBG sensing measurement technology can work well in liquid nitrogen cooling environment when the proper curing of low-temperature adhesive and epoxy resin. The measurement technology is also applied for internal strain measurement of double-layer superconducting taps at cryogenic temperature. There was not chirp phenomenon of FBG sensor occurred in liquid nitrogen environment for the developed quasi-distributed embedded FBG sensor with high measurement accuracy.
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