斑晶變晶 的英文怎麼說

In the paper, we describe the whole configuration of the joint transform correlator ; introduce the correlative theories of joint fourier transform in detail ; in order to achieve better correlation result, the nonlinear processing of joint transform power spectrum ( jtps ) is put forward, the effect of jtps laplace sharpening and binary processing to the correlation image is given ; the method of the best binary threshold is determined ; we analyse the correlation image, present the way that removes liquid crystal diffraction spot, direct current spot and image noise, and binarize the correlation image finally

本論文主要對提出的聯合變換相關的整體結構進行了描述；詳細介紹了聯合傅里葉變換的相關理論；為了得到更好的相關結果，本文提出對聯合功率譜進行非線性處理的方法，給出了聯合變換功率譜的拉普拉斯銳化和譜的二值化處理對相關峰圖像的影響及二值化最佳閾值的確定方法；對相關峰圖像信息進行了分析；提出了消除液晶衍射光斑、直流光斑和圖像噪聲的方法；最後對相關峰圖像進行了二值化處理。

According to the guidline, two nd : yag lasers have been designed and set up, one is end - pumped by lower output power ld using a selfoc micro lens, and the other is end - pumped by high output power ld using a pair of lenses are designed, and the characteristics such as output power and power stabilization of both solid - state lasers are investigated. thirdly, when an empty liquid crystal cell is inserted in the cavity of the nd : yag laser pumped by high power ld, the laser can operates in single axial mode. finally, according to the relationship between the laser output power and the longnitudinal a ld - end - pumped nd : yag laser sensor for displacement measurement has been investigated theoretically and demonstrated experimently, the results indicate that when the mean radius of pumping inside the laser cavity is far less than that of the oscilating laser mode, the exponential of the output power is a gauss function of the longitudinal positon of focused spot of ld pumping beam, both the measurement range and the sensitivity are dependent on the incident pumping power, as the incident pumping power is increased, the measurement range is enlarged and the sensitivity is improve d

本文首先介紹了ld泵浦nd ： yag激光器的發展狀況、主要特性及其應用，從四能級速率方程出發，推導了ld泵浦nd ： yag激光器的閾值、輸出功率和斜效率的表達式，並簡述了激光器的工作原理、結構型式和倍頻方法；其次，以空間相關的速率方程為基礎，提出了ld端面泵浦nd ： yag激光器的設計方法，給出了一定泵浦耦合方式下，振蕩光模尺寸、最佳輸出耦合率、泵浦光模尺寸、泵浦光焦斑位置等參數的選取依據，以此為依據，設計了自聚焦透鏡耦合小功率ld泵浦nd ： yag激光器和透鏡組耦合高功率ld泵浦nd ： yag激光器，對激光器的輸出功率和功率穩定性等特性進行了實驗研究；再次，在帶尾纖輸出的高功率ld泵浦nd ： yag激光腔內插入一隻空液晶盒，觀察到了激光器以單縱模運轉；最後，根據泵浦光焦斑端面位置對激光輸出功率的影響規律，提出了ld端面泵浦nd ： yag激光位移傳感新方法，並進行了理論和實驗研究，研究結果表明：當激光晶體內泵浦光平均光斑半徑遠小於振西安理工大學碩士學位論文蕩光束腰半徑時，激光輸出功率的自然指數與泵浦光焦斑的縱向位置成高斯變化規律，測量范圍和靈敏度依賴于泵浦功率，隨著泵浦功率的增加，測量范圍擴大，靈敏度提高，當端面泵浦功率為7 . 24w （最大輸出功率為1 . 926w ）時，激光位移傳感器的測量范圍和靈敏度分別是13 . 045mm和0 . 148mw / pm 。

A cyclic radial shearing interferometer was used to diagnose the wavefront distortion of a laser system and an lcslm ( liquid crysnd spatial ligh modulator ) was used to control it. some results have been summarized as follows : l. according to the theory of scalar quanity diffeaction and the model of the random gaussian phase screen of low frequency wavefront, the effect of the low frequency wavefront with different rms gradient on the focal spot of a laser beam was studied

本論文在激光光束波前畸變檢測和控制上進行了新的探索，主要就空間相位調制環路徑向剪切干涉儀以及它對波前畸變的檢測和液晶空間光調制器及其對中頻段波前畸變的控制進行了研究，其研究的內容和取得的成果如下：一、根據標量衍射理論，結合低頻波前畸變的高斯隨機位相分佈模型，研究了不同均方根梯度低頻畸變波前對激光光束焦斑聚焦性的影響，並採用描述中頻段波前畸變的功率譜密度概念，模擬計算了它對激光焦斑旁瓣的貢獻。

( 3 ) we explore photorefractive screening solitons and characters of beam transmission in sbn : 61 : cr crystals. the dependence of beam diameter at the crystal output face on applied field is presented. and influences of the limiting space charge field of the crystals on the experimental results are analyzed

（ 3 ）初步研究了兩塊不同摻cr濃度的sbn 61 cr晶體中的屏蔽型空間孤子效應，以及不同外加直流電場作用下光束在晶體中的傳輸，給出了晶體出射表面處光斑直徑隨外電場的變化曲線，並分析了晶體中空間電荷場的飽和效應對實驗結果的影響。

Numerical viscoelastic modeling for porphyroclast rotation in ductile shear zones is done by a viscoelastic finite element program based on detailed investigation to three ductile shear zones, the taihangshan mountains, north china. in this model porphyroclast garnet is assumed as isotropic elastic material with small elastic deformation, while the matrix quartz, feldspar as viscous fluid maxwell material which has increasing deformation with time. the viscosity of matrix is supposed to be 10

採用粘彈性力學分析程序對太行山阜平地區剪切帶中斑晶旋轉問題進行了有限元數值模擬。在計算模型中假定：石榴石斑晶為彈性材料，在應力作用下只產生很小的彈性變形石英長石質的基質部分為粘彈性材料，它具有隨時間變形不斷增大的特性。

Plastic strain first starts from ambient of the porphyroblast, and then develops to rims of porphyroblast and gradually transfers to the centers of porphyroblasts. the brittle remains in the central parts of porphyroblasts come to be decreased through the plastic deformation development, which is accordance with the banding of intensity in many mylonitization zones on wild occurrences and observation in the fabrics of mylonitization rocks under microscope

長石眼球構造的形成主要是由長石與石英的韌性差決定的，塑性變形首先從斑晶的周圍部分開始，逐漸向斑晶發展，脆性殘斑核不斷減小，這與剪切帶內糜棱巖化強度分帶相一致。

Shear zones ; porphyroblast ; large plastic deformation ; numerical modeling ; taihang mountains

剪切帶斑晶塑性大變形計算機模擬太行山

Analysis for kinetics and deformation of porphyroblasts within ductile shear zones and numerical modeling in large plastic deformation

剪切帶中斑晶的運動學和變形分析及塑性大變形計算機模擬

Numerical modeling for porphroblast s rotation and deformation of augen fabrics in ductile shear zones is done by a large plastic deformation programm based on detailed investigation to three ductile shear zones, taihangshan mountains

在對太行山阜平地區三條剪切帶作了詳細觀察和測量的基礎上，就斑晶旋轉和眼球構造進行了塑性大變形的計算機模擬。

Based on the rate - equation theory of four - level system, the expressions of threshold pump power, output power and slope efficiency are given. the influence of space distribution of pump light ( the position of focusing point, dimension of pumping light and divergence angle ) to the output characteristics are also discussed. then, by investigating the effects of thermal effect of laser crystal on the size of laser cavity mode, we obtain the mode - matching principle of high power laser diode end - pumped solid - state lasers

其中，在泵浦光的空間分佈變量中我們分別考慮了泵浦光聚焦后的腰斑大小、聚焦腰斑在增益介質中的位置以及泵浦光在介質中發散角的影響；然後我們研究了在高泵浦功率下激光晶體因吸收泵浦光而產生的熱效應所導致的熱透鏡效應以及熱致衍射損耗，通過分析它們對振蕩激光腔模尺寸的影響，得到了高功率半導體激光二極體端面泵浦固體激光器模式匹配的要求，為高功率連續單頻nd ： yvo _ 4激光器的優化設計提供了理論依據。