【作者】 陶然；

【导师】 吴许强； 俞本立；

【作者基本信息】 安徽大学 ， 光学， 2013， 硕士

【摘要】 光纤微振动传感技术早在20世纪70年代就已问世,是一种涉及到光学、精密仪器、电子、信号处理等多种学科的综合性技术,在军事国防、信息情报等领域发挥着重要作用。在这项技术中,后续信号的数字化处理是整个传感系统的核心之一。近年来,数字信号处理技术的迅速发展大大加快了光纤微振动传感技术革新的步伐。本论文首先介绍了光纤微振动传感技术的发展历史和相关应用,总结了数字化光纤微振动传感相位载波调制解调技术(PGC)的研究现状,进而阐明本课题的研究意义。在文章的理论部分,重点描述了光纤Michelson干涉仪微振动信号的传感机理,并给出了PGC解调的数学模型。针对实验室相关项目的需求,本文设计出了一种基于DSP的数字化解调系统,包括光电转换、差分驱动、AD转换、DDS振荡电路、McBSP接口电路、DDR2、FLASH、复位电路、JTAG、电源系统等部分。分析了其中的关键技术,并确定使用AD7986作为模数转换器件,其采样精度和采样速率分别可达18-bit和800kS/s。最后,根据所要处理的数据量,选择了TI公司DaVinci系列的TMS320DM6437作为主要处理器。为了降低课题开发成本和设计风险性,本文将整个解调系统分为前端模块和TMS320DM6437最小系统两部分。最终,在硬件上完成了整个系统的电路设计、焊接和调试等工作。更多还原

【Abstract】 Fiber micro-vibration sensor technology had come out as early as in the1970s, is a kind of integrated technology which involves optics, precision instruments, electronics, signal processing, and other disciplines. And it plays an important role in areas such as military defense, information intelligence. In this technology, the digitization processing of the follow-up signal is the core of the sensor system. For the past few years, the development of digital signal processing technology has greatly improved the optical fiber vibration sensing technology mature.This thesis firstly introduces the development history of the optical fiber sensing technology and related applications, then summarizes the current research status of digital optical fiber micro-vibration sensing phase generated carrier(PGC) modulation demodulation technology, and clarify this topic research significance. In the theory section of the article, mainly describes the sensing mechanism of the optical fiber Michelson interferometer micro vibration signal, and gives the mathematical model of PGC demodulation.According to the need of laboratory related projects, this paper designed a kind of digital demodulation system based on DSP, including photoelectric conversion, differential drive, AD conversion, DDS oscillation circuit, McBSP interface circuit, DDR2, FLASH, reset circuit, JTAQ and power supply system. The key technology of the system is analyzed, and determine, using AD7986as analog to digital converter, and the sampling precision and sampling rate respectively can reach18-bits and800kS/s. Finally, according to the amount of data to be processed, we chose the TI Da Vinci series of TMS320DM6437as the main processor.In order to reduce the project cost of development and design risk, the demodulation system can be divided into front-end module and TMS320DM6437minimum system two parts in this paper. Finally, we have finished the circuit design of the whole system in hardware, welding and debugging, etc.更多还原