| 藍(lán)綠激光在海水中的散射特性及其退偏研究 | ||
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| 論文標(biāo)題:藍(lán)綠激光在海水中的散射特性及其退偏研究 論文作者 論文導(dǎo)師 廖云,論文學(xué)位 碩士,論文專業(yè) 光學(xué)工程 論文單位 電子科技大學(xué),點(diǎn)擊次數(shù) 26,論文頁(yè)數(shù) 57頁(yè)File Size1229K 2006-05-01論文網(wǎng) http://www.lw23.com/lunwen_108028332/ optical scattering;degree of depolarization;Monte carlo simulation;Stokes vector;Mueller matrix;blue-green laser 研究藍(lán)綠激光在海水中的散射特性以及由散射引起的退偏現(xiàn)象,是為了解決水下通信、探測(cè)、成像的相關(guān)問(wèn)題。本文綜述了海水對(duì)光的吸收、散射特性以及海水的內(nèi)在光學(xué)性質(zhì)和外在光學(xué)性質(zhì);詳細(xì)介紹了海水的散射理論,包括瑞利散射、Mie散射以及Mie散射的偏振理論。 本文以球形粒子的Mie散射理論、Stokes矢量法以及Mueller矩陣來(lái)研究海水的散射特性和散射中的退偏振度變化;通過(guò)Monte Carlo方法模擬藍(lán)綠激光在海水傳輸過(guò)程中的散射現(xiàn)象以及散射中的退偏度變化與海水深度的關(guān)系,發(fā)現(xiàn)隨著海水深度的增加,散射后的光斑半徑、退偏振度將逐漸增大。最后通過(guò)光學(xué)工程軟件(LightTools)對(duì)海水中的散射進(jìn)行仿真實(shí)驗(yàn),研究散射與海水中粒子密度、粒子大小和相對(duì)折射率的關(guān)系。實(shí)驗(yàn)結(jié)果表明,隨著粒子半徑、粒子密度和相對(duì)折射率的增加,散射的強(qiáng)度將顯著增加。本文的研究方法和研究結(jié)果,對(duì)提高水下通信、探測(cè)和成像系統(tǒng)的性能提供了理論基礎(chǔ)和實(shí)驗(yàn)驗(yàn)證。 To study blue-green laser light scattering and polarization status changes in the ocean,is used to resolve the relative problem of optical communication,detection and imaging under water.In the paper,sea water characteristic of absorption and scatter- ing,and intrinsic optical character and extrinsic optical character of sea water are summed up;The scattering theories of sea water,including Rayleigh scattering ,Mie scattering by spherical particles and polarization theories of Mie scattering,are described in detail. It was studied in the article that scattering characteristic and its polarization status changes in the sea water are based on the Mie scattering theories of spherical parti- cle,Stokes vector and Muller matrix. A Monte Carlo algorithm was presented to model the relation between the scattering phenomenon,depolarization changes and sea water depth,It is discovered that the radius of scattering point and the degree of depolarization increase with increasing of the sea water depth.At last,a optical engineering software (LightTools) is introduced to simulate optical scattering in the deep sea water ,and studys the corelation between scattering and relative refractive index,particle density and particle size in the sea water.The experiment results show that the intensity of scattering will increase evidently with the increasing of particle size,particle density and relative refractive index.The methods and results in the article provide the basic theory and experiment validation for improving performance of communication ,detection and imaging under sea water. | ||
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