基于FPGA的EFPI传感器解调系统研究

发布时间：2018-05-16 02:22

本文选题：EFPI传感器 + 实时解调　；参考：《中北大学》2017年硕士论文

【摘要】：非本征型法布里-珀罗干涉(EFPI)光纤传感器由于其抗电磁干扰、精度高、绝缘性能高、重量轻、体积小、远距离传输等突出优点,得到了国内外各项工程的广泛应用,涉及了航天航空、医疗、矿井、高压供电等各个领域;对于EFPI光纤传感器,要实现传感信号的解调,解调技术是影响测量精度和测量速度的关键点,因此对基于EFPI传感器解调系统的研究和推进各个领域的发展具有重要意义。本文研究的对象为基于MEMS工艺的光纤法珀高温压力传感器,主要用于测量高温下压力的变化,针对此结构的EFPI传感器信号,利用高速可编程逻辑器件(FPGA)实现实时解调技术。设计了一套完整的光纤信号解调系统,包括传感模块、实时解调硬件模块、FPGA逻辑模块等。传感模块主要搭建了一个光路系统,通过光源、可调谐滤波器、标准具等光学器件,将传感信号传输到FPGA中进行处理;实时解调硬件模块主要设计了硬件系统,通过高速ADC、DAC、可编程运放,实现光电转换和传感模块的控制;FPGA逻辑模块,编写解调逻辑代码,实现了逻辑算法和数据采集;同时,本文针对光源光功率不稳定的现象,提出了一种基于硬件的光功率补偿法,并对补偿法进行了Matlab仿真和逻辑编程实现,最后将算法逻辑封装成IP核,完成了光功率的补偿。峰值解算上,引用了固定阈值的质心法寻峰和插值法实时标定,通过FPGA逻辑编程仿真,封装成IP核。实验结果表明,光功率补偿和寻峰方法可行,结果可靠精度高。最后,本文对MEMS EFPI传感器解调系统的应用方面进行了介绍,总结了论文成果并为今后的进一步研究做了展望。
[Abstract]:The extrinsic Fabry-Perot Interferometer (EFPI) optical fiber sensor has been widely used in various projects at home and abroad because of its outstanding advantages of anti-electromagnetic interference, high precision, high insulation performance, light weight, small volume and long distance transmission. It involves aerospace, medical treatment, mine, high-voltage power supply and other fields. For EFPI optical fiber sensor, demodulation technology is the key point that affects the measurement accuracy and speed to realize the demodulation of sensing signal. Therefore, it is of great significance to research and promote the development of demodulation system based on EFPI sensor. The research object of this paper is optical fiber Fabry-Perot high-temperature pressure sensor based on MEMS process, which is mainly used to measure the change of pressure at high temperature. Aiming at the signal of EFPI sensor with this structure, the real-time demodulation technology is realized by using high-speed programmable logic device (FPGA). A complete fiber signal demodulation system is designed, including sensing module, real time demodulation hardware module and FPGA logic module. The sensing module mainly builds an optical circuit system, which transmits the sensing signal to FPGA through optical devices such as light source, tunable filter, standard device, etc. The hardware module of real-time demodulation mainly designs the hardware system. The FPGA logic module of optoelectronic conversion and sensing module is realized by using high speed ADC DAC, programmable operational amplifier, demodulation logic code is compiled, logic algorithm and data acquisition are realized, meanwhile, the phenomenon of unstable optical power of light source is analyzed in this paper. An optical power compensation method based on hardware is proposed, and the compensation method is implemented by Matlab simulation and logic programming. Finally, the algorithm logic is encapsulated into IP core and the optical power compensation is completed. In the peak solution, the fixed threshold method is used to find the peak and the interpolation method is used to calibrate it in real time. The IP core is encapsulated by FPGA logic programming simulation. The experimental results show that the optical power compensation and peak finding method are feasible and the results are reliable and accurate. Finally, this paper introduces the application of MEMS EFPI sensor demodulation system, summarizes the results of the paper and makes a prospect for further research.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212;TN791

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