【作者】 张伟；

【导师】 梁大开；

【作者基本信息】 南京航空航天大学 ， 仪器科学与技术， 2008， 硕士

【摘要】 光纤布拉格光栅(FBG,Fiber Bragg Grating)传感器自发明以来,已走过了原理性的研究和实验论证的阶段,已经进入了广泛的应用阶段。目前,FBG制作工艺已经比较成熟,研究的重点也转向在降低成本的基础上,完善解调技术和复用技术等几个方向上。FBG的解调技术是FBG传感器的关键技术之一,目前对FBG解调技术的研究是国内外研究的热点,但是大多数处于实验室的研究阶段,产品化、实用化的距离还很长。本文主要就基于长周期光栅的FBG高速解调系统展开研究讨论,从以下几个方面展开:首先简要介绍了一些光纤光栅的基本情况,包括制作工艺、研究现状等。简要的阐述了用长周期光栅来解调FBG的设计方案和优点;并对光纤Bragg光栅基本理论进行了系统的研究,主要包括:FBG的传感机理分析,耦合机理分析。其次介绍了国内外常用的解调方法,并进行比较分析优缺点;重点阐述了基于长周期光栅的FBG高速解调系统的解调原理及方案的设计实现,详细的叙述了系统的光路部分、光电转换和信号调理部分,实现了信号的预处理,为数据采集卡采集数据提供了较好的信号源;介绍FBG解调系统的数据采集部分的软件的具体实现。利用VC++的集成技术实现数据采集和保存。以及使用LabVIEW软件实现数据的采集和界面的设计,可以更直观的观察实验的效果。最后讨论了此系统在温度实验和冲击实验上的应用,通过大量的实验和数据分析,论证了系统的可行性和稳定性,基本能达到预期的效果。更多还原

【Abstract】 Since its invention, FBG sensor has completed theoretic research and experiment demonstration, and becoming more widely used in many fields. Now the manufacture technology of FBG is reliable. So research field has focused to improving demodulation and multiplexing technology based on the reducing cost.The demodulation method of FBG is a critical and difficult problem in nowadays FBG sensor fields. The demodulation methods of FBG is the focus research and investigations in domestic and abroad, most of the researches are still in the phase of lab experiments and have a long way to go to the practical industrial mass productions. In the thesis, the demodulating techniques with Long period grating is discussed. The discussion as following:Firstly, the circs of the fiber grating is introduced simple, including manufacture technology, actuality researches etc. The demodulating techniques and the project for FBG with LPG are expounded and the basic theory of the fiber Bragg grating is introduced in this chapter, including the elements of coupling and sensor.Secondly, the demodulating techniques in domestic and abroad are introduced and comparing their characteristic.The demodulating techniques and the project for FBG with LPG are expounded. The each part of system is introduced detailed, including the circuit of PIN and signal disposal etc. These prepare the good signal for the NI 6024E. The software system aiming for data collecting is designed and realized with VC++ and LabVIEW. The effect of experiments can be observed clearly.Finally, the demodulating system is applied at the experiments of temperature and concussion. According to lots of experiments and data analyzing, the dependability and stability are proved.更多还原