發(fā)布時間：2018-06-09 17:29

  本文選題：水下光通信 + 菲涅爾透鏡��； 參考：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：隨著激光技術(shù)的發(fā)展，水下無線光通信技術(shù)近年來成為研究的熱點。它具有傳輸延遲小、傳輸數(shù)據(jù)量大，受環(huán)境影響低等優(yōu)點，在水下對潛通信、海洋環(huán)境監(jiān)測、水下無人機等多方面發(fā)揮重要的作用。 由于海水介質(zhì)吸收和散射的影響以及海水通信信道的隨機多變，，水下傳輸?shù)墓庑盘査p嚴重，嚴重影響了光信號的接收，因此無線光通信系統(tǒng)多采用反射式結(jié)構(gòu)的光學(xué)接收系統(tǒng)以增加光通信距離及減少誤碼率。但是反射式光學(xué)天線存在體積重量大、結(jié)構(gòu)復(fù)雜、造價高等問題。本文提出了以菲涅爾透鏡作為水下光通信系統(tǒng)的接收天線方案。理論分析、設(shè)計了菲涅爾透鏡，并仿真了透鏡接收水下激光信號的聚焦光斑參數(shù)，實驗測量結(jié)果與理論分析一致。研究結(jié)果表明：菲涅爾透鏡做為水下光通信系統(tǒng)接收天線具有面積大、焦距短、厚度薄、質(zhì)量輕、成本低等優(yōu)點。論文的主要研究內(nèi)容如下： 論文首先研究了海水通信信道的特性，理論分析了海水中各成分的吸收和散射特性，根據(jù)經(jīng)驗?zāi)Ｐ蛿M合其特性曲線，并且在光學(xué)仿真軟件Lighttools中模擬了海水的Mie（米氏）散射特性；根據(jù)水下光通信光學(xué)接收系統(tǒng)的要求及菲涅爾透鏡的通用設(shè)計公式設(shè)計了菲涅爾透鏡，并計算得到該菲涅爾透鏡各環(huán)帶的楞元頂角參數(shù)。為進一步聚焦光斑，設(shè)計了光錐形二次聚光器，并對聚光效果進行了分析；根據(jù)設(shè)計參數(shù)采用三維制圖軟件Solidworks建立菲涅爾透鏡模型，將菲涅爾透鏡模型導(dǎo)入到Lighttools中，模擬菲涅爾透鏡對太陽光及單色光的聚焦能力，分析了菲涅爾透鏡的色差；在Lighttools中建立海水散射體模型模擬了532nm激光在海水中傳輸產(chǎn)生的散射光的聚焦情況。根據(jù)菲涅爾透鏡的結(jié)構(gòu)特點及模擬的散射結(jié)果，分析了菲涅爾透鏡的光損失機理和影響水下無線光通信接收端聚光器光學(xué)效率的因素。分別在實驗室內(nèi)水槽和威海近海海域采用菲涅爾透鏡進行了水下光傳輸接收實驗研究，測量了光在不同傳輸距離時的接收光斑，并對接收光進行了三維能量分析，實驗結(jié)果與理論分析一致，驗證了菲涅爾透鏡做為水下光通信系統(tǒng)接收天線的可行性。
[Abstract]:With the development of laser technology, underwater wireless optical communication technology has become a hot spot in recent years. It has the advantages of small transmission delay, large amount of transmission data, low environmental impact, etc. It can be used for underwater communication and marine environment monitoring. Underwater unmanned aerial vehicle (UAV) plays an important role in many aspects. Due to the influence of the absorption and scattering of seawater medium and the random variability of sea water communication channel, the optical signal transmitted under water attenuates seriously, which seriously affects the reception of optical signal. Therefore, optical receiving systems with reflective structure are used in wireless optical communication systems to increase optical communication distance and reduce bit error rate (BER). However, the reflective optical antenna has many problems, such as large volume and weight, complex structure and high cost. In this paper, Fresnel lens is used as the receiving antenna of underwater optical communication system. The Fresnel lens is designed and the focal spot parameters of the lens receiving underwater laser signal are simulated. The experimental results are in agreement with the theoretical analysis. The results show that Fresnel lens has the advantages of large area, short focal length, thin thickness, light mass and low cost as receiving antenna of underwater optical communication system. The main contents of this paper are as follows: firstly, the characteristics of seawater communication channel are studied, the absorption and scattering characteristics of each component in seawater are analyzed theoretically, and the characteristic curves are fitted according to the empirical model. The Mieh scattering characteristics of seawater are simulated in the optical simulation software Lighttools, and the Fresnel lens is designed according to the requirements of optical receiving system for underwater optical communication and the general design formula of Fresnel lens. The vertex parameters of corrugated elements in each ring of the Fresnel lens are calculated. In order to further focus on the spot, the conical secondary concentrator is designed, and the effect of light concentration is analyzed. According to the design parameters, the Fresnel lens model is established by using 3D drawing software Solidworks, and the Fresnel lens model is imported into Lighttools. The focusing ability of Fresnel lens to solar and monochromatic light is simulated and the color aberration of Fresnel lens is analyzed. Based on the structural characteristics of the Fresnel lens and the simulated scattering results, the optical loss mechanism of the Fresnel lens and the factors affecting the optical efficiency of the optical concentrator at the receiver end of the underwater wireless optical communication are analyzed. The experimental study of underwater optical transmission and reception was carried out by Fresnel lens in the laboratory flume and the offshore waters of Weihai, respectively. The receiving spot of light at different transmission distances was measured, and the three dimensional energy analysis of the received light was carried out. The experimental results agree with the theoretical analysis and verify the feasibility of Fresnel lens as the receiving antenna of underwater optical communication system.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.1

【參考文獻】

相關(guān)期刊論文 前10條

1 支新軍,艾勇;一種自由空間光通信光路的設(shè)計與分析[J];半導(dǎo)體光電;2003年03期

2 王廣聰;董淑福;溫東;喬明;;海水中藍綠激光傳輸特性研究[J];電子技術(shù);2010年03期

3 張明,黃良甫,羅崇泰,安棟梁,孫燕杰,王多書,郭俊濤;空間用平板形菲涅耳透鏡的設(shè)計和光學(xué)效率研究[J];光電工程;2001年05期

4 舒森;陳名松;;水下激光通信接收系統(tǒng)中干涉濾光片的設(shè)計[J];光通信技術(shù);2008年02期

5 陳名松,李直,何濤,敖發(fā)良,周勝源;適于水下通信及激光成像系統(tǒng)大功率激光器的研制[J];廣西師范大學(xué)學(xué)報(自然科學(xué)版);2001年03期

6 劉永強;申作春;蘆宇;崔崢;魯建業(yè);;均勻會聚菲涅爾透鏡設(shè)計及性能研究[J];光電子技術(shù);2012年04期

7 江傳富;;用于�？漳繕顺上竦乃鲁瑥V角光學(xué)系統(tǒng)設(shè)計[J];光學(xué)與光電技術(shù);2013年03期

8 姚敘紅;朱林泉;薛忠晉;邢進;楊敏;;菲涅爾透鏡提高太陽能利用率的研究[J];紅外;2009年03期

9 杜竹峰,黃鐵俠,盧益民;激光對潛通信的通信能力計算[J];華中理工大學(xué)學(xué)報;1997年08期

10 李俊清;星載激光對潛通信系統(tǒng)研究[J];艦船電子工程;1998年01期

本文編號：2000544