beam spot 中文意思是什麼

So the circumjacent welding should be applied at this spot and another join symmetrical to it, all sides of the place at which angle iron join are welded around with the main beam

因此應該在該位置以及與之對稱的另一聯接點處都應採用周邊焊，使角鋼連接處的各邊全部焊接，然後再與大樑周邊焊接。

Spot beam antenna

點波束天線

Centroid position of focal spot of laser beam with aberration

畸變光束的焦斑質心位置

It has been shown that when the partially coherent beams propagate in the atmosphere, it may be less affected by turbulence than are fully coherent ones. moreover in laser fusion a highly coherent beam is transformed into a partially coherent beam, for reducing the speckle and for getting more smooth focused spot

例如，部分相干光在大氣中傳輸時所受大氣騷動的影響要比完全相干光小得多;並且部分相干光束具有光強比較均勻，對散斑低靈敏等優點而被應用於激光核聚變等領域。

Abstract : the far - field spot characteristics of laser converted by random phase plate are analyzed theoretically, including the shape, size, rotational symmetry and diffractive efficiency of the spots, as well as the distribution of subsidiary spot. by comparing the influence of phase element shape ( triangular, square and hexagonal ) on the characteristics, we found that the random phase plate with hexagonal array structure is more suitable for the beam smoothing in laser fusion

文摘:從理論上分析了激光經隨機位相板變換后在遠場的光斑特性（包括光斑的形狀、大小、旋轉對稱性、衍射效率以及旁瓣分佈） ，通過比較三種形狀位相元（等邊三角形、正方形和正六邊形）的遠場光斑特性，得知正六邊形位相元結構的隨機位相板更適合於激光聚變中的束勻化。

The effect on display characteristic made by thermal deformations of the shadow mask is comprehensively investigated. by using the electron beam distribution automatic measurement system with a micro - deflective coil, a concave spot in luminance distribution can be get. it changes its position when the shadow mask changes its form

本文系統全面地分析了傳統蔭罩的各類熱變形對顯示屏特性的影響，利用本文研製的電子束亮度分佈自動測試系統，附加一個微偏轉磁場，使相鄰兩電子束打在同一顏色的熒光粉條，並形成一個亮度凹點，當蔭罩變形時，凹點位置作相應的位移，以此原理跟蹤測量凹點位移量，即可得到色純漂移動態變化曲線。

In this paper, at the cut - in spot of beam active vibration control and use the pzt material as the drive component, the main research works can be summarized as follows : 1 ) using the finite element theory, a general finite element formulation of piezoelectric media is derived, the direct and converse piezoelectric effects are considered in the formulation

本文從梁的振動主動控制研究為切入點，利用了pzt材料作為驅動元件，作了如下幾個方面的研究： 1 ）利用有限元理論，考慮壓電材料的正、逆壓電效應的影響，導出了機電耦合壓電元件的有限元方程。

The propagation of ultrashort laser pulse in air is analyzed with mechanics analogy by considering kerr effects and free electron defocusing. the equation describing the evolution of the laser spot is derived. it is shown that long distance focusing requires large initial beam and the propagation distance is very sensitive to the initial divergence angle of the laser beam

考慮多光子電離效應和光學kerr效應，首次利用力學類比的方法研究了超短脈沖激光在電離氣體中的傳輸，詳細分析了傳輸距離與激光初始光斑、初始發散角以及激光功率的關系，提出了實現長距離傳輸的條件。

In the experiment, we use the he - ne laser and the semiconductor laser as the source, record the bessel beam patterns behind the axicon by using a digital camera and a microscope, measure the radius of the bessel beam central spot by film - scanning and measure the effect of both the radius of the aperture and the open angle of the axicon on the maximum non - diffraction distance. the experiments show that a specific propagating range has constant power and the beam has a bessel - like distribution in this range. the results agree with the beam corresponding to a diffraction free beam

同時我們還採用膠片掃描的方法測量了無衍射光束的中心光斑尺寸，測量了不同光闌孔徑和不同稜角情況下的最大無衍射距離和傳播軸附近橫截面內微小光孔中的光強，實驗結果顯示當激光光束經過軸棱錐轉換後有一段距離功率變化很小，且分佈近似貝塞爾分佈，符合無衍射光束的特性;經過聚焦后，呈現三維分佈中空的光束bottlebeam ，實驗結果與理論分析基本吻合。

And it investigates the appearance condition ( including joint, crack, eroding, corrosion, braking pole device rupture, crane - girder ' s gnawing railway and so on ) of the whole crane - girder system on the spot, at the same time, it also actually examines the stress of the beam, chemical ingredient, distortion and railway excursion, etc. through sampling, and based on the actually examined results, it checks and calculates the carrying capacity of crane - girder system. then, based on the investigating on the spot and the calculated result, it discusses the mechanism of fatigue failure of the upper part of welded steel crane - girder, analyses the reason of steel crane - girder in the high - frequency emerging the fatigue crack, institutes the strengthened method of damaged steel crane - girder of accurate packing up workshop of the primary mill plant. finally, it presents some advice and suggestions for the repairing and strengthening method of fatigue crack of upper part of steel crane - girder in the high - frequency

針對包鋼初軋廠精整車間鋼吊車樑上部區域出現裂縫這一問題，本文首先綜述了國內外關于焊接鋼吊車樑上部區域疲勞裂縫的研究現狀；其次對整個吊車梁系統的外觀情況（包括連接、裂縫、腐蝕、銹蝕、制動桿件斷裂、吊車啃軌等）進行了現場調查，抽樣實測了梁的應力、化學成分、變形及軌道偏移等，根據實測結果，對吊車梁系統的承載能力進行了驗算；然後，根據現場調查及計算結果，探討了焊接鋼吊車樑上部區域疲勞破壞的機理，分析了重級工作制鋼吊車梁出現疲勞裂縫的原因，制定了初軋廠精整車間破損鋼吊車梁的加固方案；最後就重級工作制鋼吊車樑上部區域出現疲勞裂縫的修復與加固方案提出了一些意見和建議。

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 。

On the basis of discussing the analyzed restraint relationship between the link loss and the spot - beam antenna gain a new spot - beam model of optimum design named link level balance spot - beam model is proposed

在分析鏈路損耗與點波束天線增益之間制約關系的基礎上，提出了一種新的點波束優化設計模型鏈路電平平衡點波束模型。

Beam spot stretch

束點擴展

The laser beam spot evolution and electron density in the guiding range are evaluated with the burn pattern and the measured conductivity. the above results will be useful in ultrashort laser pulse amplification and future research in ultrashort intense laser propagation in plasmas and ionizing gases

以上研究結果對于超短脈沖激光放大技術研究以及超短超強脈沖激光在低密度等離子體和空氣中長距離傳輸和聚焦研究等具有重要的實用參考價值。

In the paper, both the size of the source and of the beam spot of a extended gaussian beam are considered and their influences on both the lateral and axial resolution of a fluorescent confocal microscopy are studied and calculated based on the power transfer function and three - dimensional pulse spread function

摘要研究一定光源孔徑、束斑的高斯光束對熒光共焦顯微鏡橫向、縱向解析度的影響，導出了熒光功率傳輸函數、三維響應函數。

We will consequently refer to it as the beam "spot size".

我們將它稱為光束的「光斑尺寸」。

We will consequently refer to it as the beam " spot size "

我們將它稱為光束的「光斑尺寸」 。

( 3 ) the direct slicing data are processed in order to accurately extract and reconstruct the data information of the 2d contours. based on it, the radius compensation of laser beam spot, the filling contours and the optimization of the scanning paths are all implemented

（ 3 ）通過對直接分層輪廓進行處理，實現了層片輪廓數據的提取、層片輪廓的重建、激光光斑的補償，以及層片輪廓的填充和掃描路徑的優化。

Beam spot diameter

束斑直徑

And we also provide a detection method whose precision is on the order of micro radians. all of the above is based on technologies on ccd, dsp digital control and digital procession of images. we design a optical amplifier system matching the specified ccd camera, in order to catch qualified laser beam spot images

本論文對光通信精跟蹤的技術進行了論述、分析，在此基礎上提出實現十微弧度跟蹤精度的精跟蹤系統原理樣機的設計方案，及能檢測微弧度量級的檢測方法，這主要基於ccd探測技術、 dsp數字控制技術和數字圖像處理技術。