本文關(guān)鍵詞：復(fù)雜環(huán)境下的激光成像及傳輸技術(shù)研究　出處：《北京交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 相位共軛 修復(fù)畸變 關(guān)聯(lián)成像 水聲通信 大氣湍流

【摘要】：激光技術(shù)如今被廣泛應(yīng)用在激光雷達、激光測距、激光遙感成像及水下光學(xué)成像等領(lǐng)域,然而激光在大氣及水下等復(fù)雜環(huán)境傳輸過程中,不可避免的要受到介質(zhì)的影響,尤其在大氣中傳輸時,由于大氣吸收、散射以及湍流等效應(yīng)會使光信號衰減、光強起伏及相位起伏等,這些問題限制著激光技術(shù)的進一步推廣應(yīng)用。因此,對于激光在復(fù)雜環(huán)境下的傳輸及成像問題的研究具有重要的意義,論文的工作圍繞該問題展開,主要完成了以下的工作:1、完成了畸變圖像的實時修復(fù),并解決了復(fù)雜環(huán)境成像分辨率低的問題。對于消除圖像畸變的方法進行了理論研究,完成了消除圖像畸變的實驗設(shè)計,搭建三波混頻光學(xué)相位共軛消除圖像畸變的實驗系統(tǒng)。在實現(xiàn)12線/mm高分辨率的同時,首次將光學(xué)增益提升至17.8dB;本文利用三波混頻來獲取相位共軛光,該方法光路簡單、轉(zhuǎn)換效率高、響應(yīng)速度快,且所需泵浦功率低,對今后實時消除畸變具有一定的指導(dǎo)意義。2、提出了水下圖像傳輸所面臨的分辨率和傳輸距離不可兼得問題的解決方案。首次將水下關(guān)聯(lián)探測及水聲通信結(jié)合(發(fā)明專利申請?zhí)?201611183949.5),設(shè)計水下關(guān)聯(lián)圖像遠程加密傳輸裝置,利用光學(xué)成像實現(xiàn)高分辨率,聲學(xué)傳輸實現(xiàn)遠距離,關(guān)聯(lián)探測實現(xiàn)加密;該方案不僅能保持光學(xué)成像高分辨率的優(yōu)點,同時還可解決光學(xué)信號在水下傳輸距離短等問題。3、基于Kolmogorov理論,利用相位屏方法,對激光在湍流大氣中的傳輸特性進行了研究,計算不同條件下的光強起伏及相位起伏,且分析了相位共軛技術(shù)修復(fù)大氣畸變的可行性。利用三波混頻光學(xué)相位共軛技術(shù)響應(yīng)快、光路簡潔、實時修復(fù)等特點,有望將其使用于水下、大氣及生物組織等復(fù)雜環(huán)境,消除因介質(zhì)帶來的畸變,實現(xiàn)復(fù)雜環(huán)境下的高分辨率成像。
[Abstract]:Laser technology is now widely used in laser radar, laser ranging, laser remote sensing imaging and underwater optical imaging etc. However, laser in air and underwater complex environment in the process of transmission, influence inevitably by the media, especially the transmission in the atmosphere, due to atmospheric absorption, scattering and turbulence effects will make the optical signal attenuation, light intensity and phase fluctuations, these problems restrict the further application of laser technology. Therefore, it is significant to research the problem of laser transmission and imaging in complex environment, this thesis focuses on the problems, mainly completed the following work: 1, completed the real-time repair image distortion, and solves the problem of low resolution imaging in complex environment. The method of eliminating the image distortion is studied theoretically, and the experimental design of eliminating the image distortion is completed. The experimental system of eliminating the image distortion with the three wave mixing optical phase conjugation is built. In the realization of the 12 line /mm high resolution at the same time, for the first time will enhance the optical gain to 17.8dB; using three wave mixing to obtain the phase conjugate light, the method of simple optical path, high conversion efficiency, fast response speed, and the required pump power is low, the future real-time eliminate distortion has certain guiding sense. 2. A solution to the problem of the resolution and transmission distance of underwater image transmission is proposed. For the first time with underwater acoustic communication and correlation detection (patent application number: 201611183949.5), remote transmission device encryption related image design of underwater high resolution optical imaging, acoustic transmission remote detection, correlation encryption; advantages of the scheme can not only maintain the high resolution optical imaging, but also can solve the problem the optical signal in underwater short distance transmission etc.. 3, based on Kolmogorov theory, the transmission characteristics of laser in turbulent atmosphere were studied by phase screen method. The intensity fluctuation and phase fluctuation under different conditions were calculated, and the feasibility of phase conjugation technology to repair atmospheric distortion was analyzed. The three wave mixing optical phase conjugation technology has the characteristics of fast response, simple optical path and real-time repair. It is expected to be applied to complex environment such as underwater, air and biological tissue, to eliminate the distortion caused by the medium, and achieve high resolution imaging in complex environment.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN24

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