| 杨韬略,李凤,王省哲*.低温下FBG-GMM光纤磁场传感性能与增敏的实验研究[J].实验力学,2020,35(5):790~796 |
| 低温下FBG-GMM光纤磁场传感性能与增敏的实验研究 |
| Experimental study on magnetic field sensing performance and sensitization of FBG-GMM at low temperature |
| 投稿时间：2019-08-22 修订日期：2019-10-16 |
| DOI：10.7520/1001-4888-19-143 |
| 中文关键词: 超磁致伸缩 FBG 磁场传感 低温环境 传感增敏 |
| 英文关键词:giant magnetostriction FBG magnetic field sensing low temperature sensitization |
| 基金项目:国家自然科学基金(11672120，11932008)资助 |
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| 中文摘要: |
| 超磁致伸缩材料(Giant magnetostrictive material, GMM)是一种响应快、应变大、能量密度高的新型功能材料，广泛应用于传感、能量转换等关键元器件中。特别是在某些实际应用中(例如航天器服役环境)，GMM需要工作于低温环境，其低温下的力-磁行为越来越引起人们的关注。本文基于实验室自主搭建的低温力-磁加载实验装置，利用光纤布拉格光栅(fiber Bragg grating，FBG)低温应变测量方法与GMM磁致伸缩特性，开展了磁致伸缩-光纤光栅磁场传感结构在两种低温环境273K和77K下的力-磁特性实验，获得了GMM在预应力和外加磁场下的应变特征。研究结果表明：温度对GMM力-磁性能有显著影响，相对于室温(293K)和273K，GMM在77K下的磁致应变减小一个数量级；预压力对GMM磁致伸缩增强效果大大减弱。进一步，采用FBG测试部分的悬空结构设计，实现FBG-GMM磁场传感器性能的有效增敏，相比传统粘贴型FBG磁场传感器，测量敏感系数提高约7倍，可用于低温环境下的磁场高灵敏监测。 |
| 英文摘要: |
| Giant magnetostrictive material (GMM) is a new type of functional material with fast response, large strain output and high energy density. It is widely applied in crucial components such as sensing and energy conversion. Particularly, in some practical applications (such as spacecraft service environments), GMM can work in low temperature environments. Its mechanical-magnetic behavior at low temperatures has attracted increasing attention. Based on the low temperature mechanical-magnetic loading experimental device and using the fiber Bragg grating (FBG) low temperature strain measurement method and the GMM magnetostrictive characteristics, the mechanical-magnetic performance of FBG-GMM magnetic field sensor in two low temperature environments of 273K (0℃ ice-water mixture) and 77K (liquid nitrogen) is studied experimentally. The strain characteristic under pre-stressing force and external magnetic field is obtained. The results show that the temperature has a significant effect on the magnetic properties of GMM. Compared with the magnetostrictive strain of GMM at room temperature (293K) and 273K, the result at 77K can be obviously reduced by an order of magnitude; the pre-pressure on magnetostrictive of GMM is greatly weakened. Furthermore, a new design of the suspension of FBG structure is suggested to realize the effective sensitization of the FBG-GMM sensor. In comparison with the traditional paste type of sensor, the sensitivity is improved by about 7 times, which can be used for magnetic field monitoring in a low temperature environment. |
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