基于Labview平台混沌光层析系统响应函数的测量

发布时间：2018-03-02 15:04

本文选题：混沌光　切入点：LabVIEW　出处：《太原理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：混沌信号,是一种随机起伏的强度波形信号,它具有类噪声、无法预测的特性,所以它在通信领域被广泛应用。例如它可应用于混沌通信、光纤激光传感和图像密码研究等。在通信系统的研究过程中,系统响应函数的测量是至关重要的。在目前的系统响应函数的研究中,伪随机码序列的使用被看作是一种研究手段。因为增加伪随机脉冲序列的码元长度可以增加测量系统分辨率的精度。但是,伪随机光脉冲序列的产生需要通过电随机码调制激光器,受电子器件带宽瓶颈的限制,应用范围并不是很广泛。而混沌信号的相关后拥有类似于伪随机码的相关特性,这就为测量系统响应函数提供了一定的可能。并且通过光纤激光器产生的混沌信号的带宽可以达到GHz的数量级,减小了带宽对系统响应函数的影响。因此,将混沌信号作为光源测量系统响应函数,具有非常重要的研究意义。为实现混沌光系统响应函数的测量,本文研究了一个基于LabVIEW平台的数据采集系统。通过LabVIEW的强大数据处理能力,实现混沌光系统响应函数的测量。本文的主要工作内容如下:1.简单地介绍了一种成像系统,并通过该成像系统的光源选择的不同,体现出混沌光在通信、成像方面的巨大优势。2.详细介绍了系统响应函数的测量。通过对数据采集原理的介绍,为系统响应函数的测量提供了可能。3.详细地介绍数据采集的实现过程。此次数据采集使用的是LabVIEW平台搭建的数据采集系统。数据采集包括通信协议的选定,端口的设定,以及数据的存储。在端口设定的过程中,使用虚拟仪器软件结构(VISA)调用LabVIEW数据库进行数据的相关操作。数据库内包含多种函数,LabVIEW的功能都是通过这些函数实现。数据存储可以有多种类型,例如文本文档、二进制文件等。数据存储能够进行数据回放,可以为后期的数据处理提供极大的便利。4.介绍了测量系统响应函数的实验装置图。在对实验装置进行说明的过程中,通过对实验装置的各个部分功能的阐述以及实验过程的具体描述,说明了系统响应函数的测量过程。在测量系统响应函数的过程中,通过对实验样品的改变,测量不同的系统响应函数,并通过对系统响应函数的比较,说明系统响应函数对整个系统的影响。5.对用混沌光作为光源来完成系统响应函数做出总结和展望。通过对总结和展望的描述,阐述了混沌光测量系统响应函数和混沌光成像的巨大优势。
[Abstract]:Chaotic signal is a kind of intensity waveform signal with random fluctuation. It has the characteristics of similar noise and unpredictable, so it is widely used in the field of communication, for example, it can be used in chaotic communication. The measurement of system response function is very important in the research of optical fiber laser sensor and image cryptography. The use of pseudorandom code sequences is regarded as a research tool because increasing the symbol length of pseudorandom pulse sequences can improve the accuracy of measuring system resolution. The generation of pseudorandom optical pulse sequence needs to be modulated by electric random code laser. Due to the bottleneck of electronic device bandwidth, the application range is not very wide, but the correlation of chaotic signal has the correlation characteristic similar to pseudorandom code. This makes it possible to measure the response function of the system, and the bandwidth of the chaotic signal generated by the fiber laser can reach the order of magnitude of GHz, which reduces the influence of the bandwidth on the response function of the system. It is very important to study the chaotic signal as the response function of the light source system. In order to realize the measurement of the response function of the chaotic light system, A data acquisition system based on LabVIEW platform is studied in this paper. Through the powerful data processing ability of LabVIEW, the measurement of response function of chaotic optical system is realized. The main work of this paper is as follows: 1. A kind of imaging system is introduced briefly. According to the difference of light source selection of the imaging system, the great advantage of chaotic light in communication and imaging is demonstrated. The measurement of system response function is introduced in detail, and the principle of data acquisition is introduced. It provides the possibility for measuring the response function of the system. 3. The realization process of data acquisition is introduced in detail. The data acquisition uses the data acquisition system built on LabVIEW platform. The data acquisition includes the selection of communication protocol and the setting of port. And data storage. During port setting, Using Virtual instrument Software Architecture (VISA) to invoke the LabVIEW database for data related operations. The functions of LabVIEW LabVIEW in the database are implemented through these functions. Data storage can be of many types, such as text documents. Binary files, etc. Data storage can be used for data playback, which can provide great convenience for the later data processing. 4. This paper introduces the experimental device diagram of measurement system response function. The measurement process of the system response function is explained by describing the functions of each part of the experimental device and the experimental process. In the process of measuring the system response function, the change of the experimental sample is carried out. Different system response functions are measured, and the system response functions are compared. The effect of the system response function on the whole system. 5. Summarize and prospect the system response function by using chaotic light as the light source. The response function of chaotic light measurement system and the great advantages of chaotic light imaging are described.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP274.2;O439

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