基于FBGA解调的光纤光栅检测系统设计

发布时间：2018-04-13 18:18

  本文选题：FBG + 检测系统　； 参考：《安徽工业大学》2017年硕士论文

【摘要】：光纤光栅作为传感器由于体积小、质量轻、外形可变,适合埋入大型结构中,可以测量结构内部的应力、应变、结构损伤等,且具有稳定性好、抗腐蚀、抗电磁干扰的特点,适合在恶劣环境中工作;可以在一根光纤中写入多个光栅,实现分布式传感;测量信息是波长编码,不受光源的光强波动的影响,具有较强的抗干扰能力。由于具有以上这些优点,光纤光栅传感器在大型土木工程结构、能源化工、航空航天、生物医学等领域得到了广泛的应用。论文首先介绍了光纤光栅的发展历史,以及光纤光栅作为传感器的优缺点,并对FBG的结构进行了介绍说明。对常用的光纤光栅解调方法进行了介绍,给出了每种解调方法的特点、并阐述了光纤光栅在传感领域的应用。其次,对硬件平台各个器件模块进行选型,并对相应的模块的参数性能进行了介绍;考虑到实际工程应用当中可能会出现的问题,搭建出了基于FBGA解调的光纤光栅检测系统硬件平台。再次,通过调用模块的底层动态链接库,编写了相应的温度检测系统软件程序,包括初始化程序、连续采集程序等,并对温度检测系统进行试验验证,实验结果与高精度恒温箱的测量结果进行比较,验证了系统的可行性。结果表明温度检测系统的温差范围小于0.5℃,当置信概率为95.40%时,重复性指标Re为?0.0210%。此外,对光纤光栅冲击检测系统进行了软件设计,包括高速冲击数据连续采集程序、高速数据存储程序等,并对设计的冲击检测系统进行实验,选择较理想的硅胶基封装体作为传感元件,采用傅里叶变换获取数据的频谱信息,实验结果表明本文设计的冲击检测系统是可行的,其中冲击检测系统峰值波长误差小于0.05nm,响应时间小于0.1s。本文在对FBGA解调模块认识和分析的基础上,采用调用其底层动态链接库的方法来编写相应的测试软件,并通过仿真和实验研究对检测系统的可行性进行了验证,为开发出经济实用的FBG检测系统奠定初步基础。
[Abstract]:Because of its small size, light weight and variable shape, fiber Bragg grating can be used to measure stress, strain and structural damage in large structures, and it has the characteristics of good stability, corrosion resistance and electromagnetic interference resistance.It is suitable for working in harsh environment; it can write multiple gratings in one fiber to realize distributed sensing; the measurement information is wavelength coding, independent of the fluctuation of light intensity of light source, so it has strong anti-interference ability.Because of these advantages, fiber Bragg grating sensors have been widely used in large civil engineering structures, energy and chemical industry, aerospace, biomedicine and other fields.Firstly, the paper introduces the history of fiber grating and the advantages and disadvantages of fiber grating as sensor, and introduces the structure of FBG.The common demodulation methods of fiber grating are introduced, the characteristics of each demodulation method are given, and the application of fiber Bragg grating in sensing field is described.Secondly, each device module of the hardware platform is selected, and the parameter performance of the corresponding module is introduced.The hardware platform of fiber grating detection system based on FBGA demodulation is built.Thirdly, by calling the bottom dynamic link library of the module, the corresponding software program of temperature detection system is written, including initialization program, continuous acquisition program, etc., and the temperature detection system is tested and verified.The feasibility of the system is verified by comparing the experimental results with the measurement results of high precision thermostat.The results show that the temperature difference range of the temperature detection system is less than 0.5 鈩，

本文编号：1745653