分布式光纤传感器应变传递性能分析及试验研究

摘要

The distributed optical fiber sensing technology is a novel developed technique used for measuring of distributed strain and temperature and it is applicable to health monitoring for civil engineering structure. Accuracy of strain measurement is an important issue to ensure the efficiency of structural diagnosing and evaluation. Test accuracy not only depends on the performance of equipment, but also influences by strain transferring capability of distributed optical fiber sensor which is used to receive structural strain signal. The performance of strain transferring is mainly affected by the characteristics of optical fiber, physical properties of binder and configuration of sensor. In this paper, the influence of above parameters to strain measuring sensitivity is studied by theoretical analysis, and their quantitative relation is obtained by calibration experiments. The results of theoretical and experimental analysis can be used for guiding optimization design of distributed optical fiber sensor.%分布式光纤传感技术是一种新型光电监测技术,可实现应变、温度的长距离分布式检测,适用于土木工程结构的健康监测.应变量测的准确性是进行结构健康诊断和评估的关键,其中影响分布式光纤传感技术应变测量精度的因素除了设备自身性能,还与感应结构应变信号的分布式光纤传感器的应变传递性能有关.从理论上分析了传感光纤特性、粘结剂物理性质、传感器结构特征对分布式光纤传感器应变传递性能的影响,并通过传感器标定试验对各影响因素进行了定量分析.结果表明,理论分析和试验研究均有效揭示了分布式光纤传感器应变传递性能同各物理参数之间的关系,可为工程应用中传感器的优化设计进行指导.