發(fā)布時間：2018-03-02 15:04

  本文選題：混沌光　切入點：LabVIEW　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：混沌信號,是一種隨機起伏的強度波形信號,它具有類噪聲、無法預(yù)測的特性,所以它在通信領(lǐng)域被廣泛應(yīng)用。例如它可應(yīng)用于混沌通信、光纖激光傳感和圖像密碼研究等。在通信系統(tǒng)的研究過程中,系統(tǒng)響應(yīng)函數(shù)的測量是至關(guān)重要的。在目前的系統(tǒng)響應(yīng)函數(shù)的研究中,偽隨機碼序列的使用被看作是一種研究手段。因為增加偽隨機脈沖序列的碼元長度可以增加測量系統(tǒng)分辨率的精度。但是,偽隨機光脈沖序列的產(chǎn)生需要通過電隨機碼調(diào)制激光器,受電子器件帶寬瓶頸的限制,應(yīng)用范圍并不是很廣泛。而混沌信號的相關(guān)后擁有類似于偽隨機碼的相關(guān)特性,這就為測量系統(tǒng)響應(yīng)函數(shù)提供了一定的可能。并且通過光纖激光器產(chǎn)生的混沌信號的帶寬可以達到GHz的數(shù)量級,減小了帶寬對系統(tǒng)響應(yīng)函數(shù)的影響。因此,將混沌信號作為光源測量系統(tǒng)響應(yīng)函數(shù),具有非常重要的研究意義。為實現(xiàn)混沌光系統(tǒng)響應(yīng)函數(shù)的測量,本文研究了一個基于LabVIEW平臺的數(shù)據(jù)采集系統(tǒng)。通過LabVIEW的強大數(shù)據(jù)處理能力,實現(xiàn)混沌光系統(tǒng)響應(yīng)函數(shù)的測量。本文的主要工作內(nèi)容如下:1.簡單地介紹了一種成像系統(tǒng),并通過該成像系統(tǒng)的光源選擇的不同,體現(xiàn)出混沌光在通信、成像方面的巨大優(yōu)勢。2.詳細介紹了系統(tǒng)響應(yīng)函數(shù)的測量。通過對數(shù)據(jù)采集原理的介紹,為系統(tǒng)響應(yīng)函數(shù)的測量提供了可能。3.詳細地介紹數(shù)據(jù)采集的實現(xiàn)過程。此次數(shù)據(jù)采集使用的是LabVIEW平臺搭建的數(shù)據(jù)采集系統(tǒng)。數(shù)據(jù)采集包括通信協(xié)議的選定,端口的設(shè)定,以及數(shù)據(jù)的存儲。在端口設(shè)定的過程中,使用虛擬儀器軟件結(jié)構(gòu)(VISA)調(diào)用LabVIEW數(shù)據(jù)庫進行數(shù)據(jù)的相關(guān)操作。數(shù)據(jù)庫內(nèi)包含多種函數(shù),LabVIEW的功能都是通過這些函數(shù)實現(xiàn)。數(shù)據(jù)存儲可以有多種類型,例如文本文檔、二進制文件等。數(shù)據(jù)存儲能夠進行數(shù)據(jù)回放,可以為后期的數(shù)據(jù)處理提供極大的便利。4.介紹了測量系統(tǒng)響應(yīng)函數(shù)的實驗裝置圖。在對實驗裝置進行說明的過程中,通過對實驗裝置的各個部分功能的闡述以及實驗過程的具體描述,說明了系統(tǒng)響應(yīng)函數(shù)的測量過程。在測量系統(tǒng)響應(yīng)函數(shù)的過程中,通過對實驗樣品的改變,測量不同的系統(tǒng)響應(yīng)函數(shù),并通過對系統(tǒng)響應(yīng)函數(shù)的比較,說明系統(tǒng)響應(yīng)函數(shù)對整個系統(tǒng)的影響。5.對用混沌光作為光源來完成系統(tǒng)響應(yīng)函數(shù)做出總結(jié)和展望。通過對總結(jié)和展望的描述,闡述了混沌光測量系統(tǒng)響應(yīng)函數(shù)和混沌光成像的巨大優(yōu)勢。
[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.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP274.2;O439

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本文編號：1557017