【作者】 杨军；

【导师】 苑立波；

【作者基本信息】 哈尔滨工程大学 ， 光学工程， 2002， 硕士

【摘要】 光纤传感器是20世纪70年代末发展起来的一种新型传感器，由于它体积小，重量轻，耐腐蚀、灵敏度高、不受电磁场影响、本质上安全防爆、可工作在极端恶劣场合等优点，受到军事、航空航天、能源、环保、生物医学、自动控制以及建筑施工等应用领域的青睐，是当前发展最快的一大类传感器。 低相干光测量技术由于它可进行绝对值物理量的测量，不受光学传递函数(OTF)的周期性影响，可实现大动态范围的测量，以及抗干扰性好等优良特性，正被众多的研究机构和科研人员所加以开发和推广。 本文的工作是基于部分相干光理论。首先对部分相干光原理加以介绍，给出基于互相关函数(与光谱密度)的傅立叶变换光强分析方法。应用低相干光学技术的特点，我们给出了一种新的组合干涉仪结构——非平衡式Michelson和Fizeau组合干涉仪、静态与动态组合光程扫描相结合的应变解调方案。在此基础上，我们制作了光纤应变传感测量系统，用于对被测结构物基体内部或者外部应变信息进行提取。文中详细论述系统各部分的功能原理、结构、构成与实现。并获得了实验室桥梁模型的初步实验结果。最后，讨论了将光纤传感测试方法用于桥梁结构力学特性、完整性检测和长期健康监测与评价的工程意义与价值。更多还原

【Abstract】 In recent years, fiber optical sensors have moved out of the laboratory and assumed a significant role in sensing and measurement fields. Fiber optic interferometric sensors using low coherence length source process absolute measurement, improved dynamic range and represent an active area of research.In the thesis described here, firstly the partial coherence theory is introduced since most of the my work are based on the theory. And then analysis of the light intensity is given by using the Fourier transform which is based on the homogeneous coherence function. Applying the low coherence technology, we proposed a novel type of interferometer, which can be regarded as the combination of unbalanced Michelson interferometer and Fizeau interferometer. And the detection scheme is archived by scanning the static and dynamic optical paths. On the foundation of these previous works, a fiber optical strain sensor system is constructed to extract the inner and outer strain information of structures.In the paper, the principle and setup of the strain sensor system are presented. Experimentally the system is applied to measure the mechanical strain variables inside a bridge model and experimental data are acquired. Lastly the industrial promise of this fiber optical sensor is discussed and valued in the application field of structure mechanical properties measurement and monitoring.更多还原