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介绍了现行光纤布拉格光栅(FBG)测试技术的应用领域、传感原理以及常用的封装方式,探索将FBG用于季节冻土路基这种隐蔽工程应变检测中的适应性。主要工作有:(1)基于FBG测试技术的植入梁方法,在传感器布设方面,根据不同测试对象提出了两种封装布设方式:浅置短距离半柔性探测杆和深置长距离半刚性探测杆两种封装布设方式;(2)针对现场测试需要,对电源、光纤传感器、数据采集及分析等整套现场测试系统进行了比较优选;(3)选择两处季节冻土路基作为埋设场地并开展为期1 a的观测。测试结果表明:FBG在-20~30℃的温差范围内保证了很高的存活率,所提出并实现的季节冻土路基应变测试系统具有较高的测试灵敏度和可靠性。该套测试系统为隐蔽工程的物理性质指标测试提供了新的技术手段。
This paper introduces the application field, sensing principle and common packaging methods of current fiber Bragg grating (FBG) testing technology, and explores the adaptability of using FBG in hidden engineering strain detection of seasonal frozen soil subgrade. The main work is as follows: (1) The implant beam method based on FBG test technology, in the sensor layout, according to different test objects proposed two kinds of package layout: shallow short semi-flexible probe and deep long-distance semi-rigid detection (2) In order to meet the needs of on-site testing, a set of on-site test systems such as power supply, optical fiber sensor, data acquisition and analysis are compared and optimized; (3) Two seasonal frozen soil subgrade 1-year observation. The test results show that the FBG has a high survival rate in the temperature range of -20 ~ 30 ℃. The proposed test system of seasonal frozen soil subgrade strain has high testing sensitivity and reliability. This set of test system provides a new technical measure for index testing of hidden physical properties.