| 巫佳明,谢红强*,卓莉,肖明砾,刘怀忠.基于OFDR分布式光纤传感器的应变测试试验研究[J].实验力学,2022,37(2):234~242 |
| 基于OFDR分布式光纤传感器的应变测试试验研究 |
| Study of strain testing based on OFDR distributed fiber optic sensor |
| 投稿时间：2021-05-08 修订日期：2021-05-31 |
| DOI：10.7520/1001-4888-21-114 |
| 中文关键词: OFDR 分布式光纤； 电阻式应变片； 三点弯曲； 有限元 |
| 英文关键词:OFDR distributed optical fiber resistive strain gauge three-point bending finite element |
| 基金项目:2020年四川大学实验技术立项(SCU202011);国家青年科学基金(51709193) |
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| 中文摘要: |
| 利用光频域反射技术(OFDR)测试应变时在空间分辨率、灵敏度、传感精度、响应度和测量距离上的显著优势，以铝合金梁三点弯曲试验为载体，开展了基于OFDR分布式光纤传感器的应变测试，并通过与电阻式应变片测试结果、梁三点弯曲试验有限元模拟结果进行对比分析，论证了分布式光纤传感器应变测试的可行性和准确性。试验揭示了铝合金梁在三点弯曲试验中的变形规律，通过对比分析光纤应变测试结果与有限元模拟结果，验证了OFDR 在试验过程中对铝合金梁不同部位应变测试的准确性。研究表明OFDR能对试件在时间上和空间上的微应变变化趋势进行准确测量，相较于电阻式应变片，其线性度和连续性更好，测试稳定性更高。本文研究结果可为OFDR分布式光纤用于室内应变测试提供参考。 |
| 英文摘要: |
| For strain measurement, the technology of optical frequency domain reflectometry (OFDR) has advantages in spatial resolution, sensitivity, sensing accuracy, responsivity and measurement distance. The strains of an aluminum alloy beam during three-point bending test are measured by OFDR distributed fibre optical sensors. By comparing them with the strains measured by strain gauge and the strains simulated finite element method, the feasibility and accuracy of strain measurement based on distributed optical fiber sensor are verified. The simulation results of FEM show that the strain changes of different parts of aluminum alloy beam in the process of three-point bending test can be accurately measured by the technology of OFDR, and the deformation characteristics of aluminum alloy beam under the condition of three-point bending test are revealed. The test results show that the OFDR technology can accurately measure the micro-strain changes in time and space of test specimen. Compared with the strain gauge, it has higher linearity and continuity and higher test stability. This study provides an important reference for the using of OFDR technology in strain test. |
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