基于钽酸锂晶体的热释电太赫兹探测系统的设计

发布时间：2018-03-22 07:46

本文选题：太赫兹　切入点：热释电探测器　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：太赫兹波是频率在0.1~10THz范围内的电磁波,位于微波与红外之间。正是由于处在电磁波谱的特殊频段,太赫兹电磁波具有很多特殊的性质如透射性、相干性、瞬态性和低能性等,因而太赫兹电磁波在基础研究领域、生物医学领域、通信领域、公共安全领域、无损检测以及军事领域方面都有着非常广阔的应用前景。随着新技术、新材料的发展,太赫兹技术越来越受到人们的重视并在国际范围内掀起了一场太赫兹研究热潮。尽管人类在太赫兹辐射的研究和认识方面已经取得了很大的进展,但有关太赫兹探测的问题仍未得到很好的解决。在以上背景下,本文以32通道热释电太赫兹探测器为主要对象,采用FPGA(现场可编程门阵列)作为逻辑控制单元,通过对模数转换芯片AD7490和以太网传输芯片DM9000A底层程序的开发设计,实现了太赫兹信号的模数转换以及高速数据传输。最后通过使用微软MFC基础类库完成了与硬件相对应的太赫兹探测系统软件平台的开发。具体内容如下:论文首先对热释电型太赫兹探测器的工作原理进行了介绍,提出了一种采用机械减薄双面抛光工艺和半导体工艺完成基于钽酸锂晶体薄膜的32通道线阵列热释电太赫兹探测器制备的方法。其次完成了包含前置放大电路、模数转换电路、数据传输电路和FPGA控制电路的太赫兹探测硬件系统的构建,然后通过对FPGA进行程序开发设计完成了相关芯片底层驱动程序以及系统逻辑的控制。在数据传输方面通过对串口传输、PCI-E传输和以太网传输三种传输方案进行比较,最终选择了传输速度高、兼容性好、又成本低廉、携带方便的以太网传输方案作为本系统的数据传输方案。最后在Visual Studio 2005平台下,通过使用微软MFC基础类库完成了太赫兹探测系统软件的开发,实现了基于以太网UDP协议下的太赫兹数据的接收、操作界面的设计、32路太赫兹信号数据的实时显示,并利用双缓冲绘图技术完成了直方图以及V-T图像的绘制。在此之后又对软件的操作方法和具体功能进行了介绍。经过调试验证,该热释电太赫兹探测系统可以满足对太赫兹探测的要求,并且具有稳定性好、成本低廉、可移植性强等特点。
[Abstract]:Terahertz wave is the electromagnetic wave with frequency in the range of 0.1~10THz, which lies between microwave and infrared. Because it is in the special frequency band of electromagnetic wave spectrum, terahertz electromagnetic wave has many special properties such as transmission, coherence, transient and low energy, etc. So terahertz electromagnetic wave has a very broad application prospect in the fields of basic research, biomedicine, communication, public safety, nondestructive testing and military. With the development of new technology and new materials, Terahertz technology has been paid more and more attention to, and a wave of terahertz research has been launched in the international scope. Although human beings have made great progress in the research and understanding of terahertz radiation, However, the problem of terahertz detection has not been solved well. Under the above background, the 32-channel pyroelectric terahertz detector is taken as the main object, and FPGA (Field Programmable Gate Array) is used as the logic control unit. Through the development and design of the bottom program of the ADC chip AD7490 and the Ethernet transmission chip DM9000A, Finally, the software platform of terahertz detection system corresponding to hardware is developed by using Microsoft MFC basic class library. The detailed contents are as follows:. The principle of pyroelectric terahertz detector is introduced. A method of fabricating 32 channel array pyroelectric terahertz detector based on lithium tantalate crystal thin film by mechanical thinning and double side polishing and semiconductor process is presented. The construction of terahertz detection hardware system for data transmission circuit and FPGA control circuit, Then, through the programming of FPGA, the bottom driver of the chip and the control of the system logic are completed. In the aspect of data transmission, the three transmission schemes of serial port transmission PCI-E transmission and Ethernet transmission are compared. Finally, the Ethernet transmission scheme with high transmission speed, good compatibility, low cost and convenient carrying is chosen as the data transmission scheme of this system. Finally, under the platform of Visual Studio 2005, The software of terahertz detection system is developed by using Microsoft MFC basic class library, and the receiving of terahertz data based on Ethernet UDP protocol is realized, and the design of operating interface is used to display 32 channels of terahertz signal data in real time. The histogram and V-T image are drawn by double buffer drawing technology. After that, the operation method and specific function of the software are introduced. The pyroelectric terahertz detection system can meet the requirements of terahertz detection and has the advantages of good stability, low cost and strong portability.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O441.4

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