[光][電子] 焦點，[物] 焦斑
Objective To improve HIFU focal spot accuracy.
目的：提高HIFU焦斑精度。
By infrared thermal imaging techniques in this thesis, the focal spot size and focal length of this ***lectric lens antenna are measured.
本論文應用紅外熱成像技術，對毫米波介質透鏡天線的焦斑焦距進行了測量。
The centroid position of the focal spot directly depending on intensity distribution and phase slope distribution of near field is derived and its physical meaning is described.
進一步推導了焦斑質心位置對光束近場強度分布和相位斜率分布的依賴關系式，并對該式清晰的物理意義進行了闡述。
The article discusses how to design X-ray focusing system to obtain eligible focal spot size by a series of experiments.
本文通過一系列的實驗，重點讨論如何設計X射線管的聚集系統來實現用戶需要的焦點尺寸。
The results showed that all the configurations such as response time, the focal spot size, and the depth of focus, etc, have reached the expectation.
結果表明，液晶器件的電控響應時間，焦斑尺寸，焦深等性能指标都達到了預期目标。
The Modulation Transfer Function(MTF) of X-ray tube focal sPOt and its size are the main parameters, which can be used to describe the photo function of X-ray tube focal spots.
線管焦點的調制傳遞函數（MTF）和焦點尺寸是描述X線管焦點成像性能的主要參數。
Simulation results show that the size of the focal spot increases with the number of color cycles and the basic pulse bandwidth in the dispersing direction.
模拟結果表明，焦斑尺寸隨色循環數和光栅色散方向上基準脈沖帶寬的增加而增大。
A new method-axial scanning method (ASM)-is devised to find the position of the focal spot of polycap-illary X-ray lens.
為了高效準确地确定整體X光透鏡焦斑位置，設計了一種新方法：軸向掃描法。
But the size perpendicular to polarization direction of focal spot with linear polarized beam is always smaller than that of radially polarized beam.
而線偏振光聚焦光斑垂直于偏振方向的直徑始終小于徑向偏振光聚焦光斑直徑。
The upper limit values of blurred area coverage of focal spot caused by the fluctuation of accelerating gap voltage are also calculated using a approximate method.
同時通過近似計算給出了由于加速間隙電壓波動引起束聚焦焦斑模糊範圍增大的上限值。
It is well known through many finished physics experiments that the characteristic of focal spot is one of the most crucial factors which determine whether ignition can realize or not.
高功率激光束焦斑特性是影響聚變物理實驗的關鍵因素之一。
The X-Ray tube focal spot is obtained by convergence of static field on the electron beams.
射線管的焦點是通過靜電場對電子束的會聚作用而形成的。
From the result we can see that using this method we can get high accuracy in the focal spot measuring.
設計結果表明，利用旋轉橢球面進行大口徑取樣鏡設計可以使焦斑測量具有極高的準确性。
The measurement method and error analysis method of GRIN lens focal spot diameter in IR wavelength are described.
主要介紹GRIN透鏡在紅外波段聚焦光斑直徑的測量方法及誤差分析。
The sizes of focal spot and detector aperture are the factors affecting CT image quality.
射線源焦點及探測器孔徑大小是導緻CT圖象降質的主要因素。
The focal spot sizes can immediately influence picture definition when X-ray machine carry through clairvoyance and photography.
焦點的尺寸大小及聚焦質量直接影響X射線機透視、攝影圖像的清晰度；
One of the focal spot of marine ecology is the effects of diatom on copepod reproduction, which decreases copepod egg fecundity and hatching success.
矽藻對桡足類繁殖的影響是近年來海洋生态學的熱點問題，主要體現在降低了桡足類的産卵和孵化成功率。
The Gauss width of focal spot which is too small results in the sampling error while using CCD as the centroid detecting device of Shack-Hartmann Wavefront Sensor(SHWS) in Adaptive Optics(AO) system.
自適應光學系統中采用CCD作為哈特曼波前傳感器的光斑質心位置探測器時，由于光斑的高斯寬度較小會帶來大采樣誤差。
Under the different laser parameters, the electron energy gain depends on the laser intensity, focal spot size and pulse width.
不同激光參鼍條件下，得到了電子的能量增益與激光強度、焦斑大小和脈沖寬度關系。
The focal spot, size depend on the pinhole diaphragm diameter of spatial filter.
光斑尺寸和空間濾波系統的針孔光闌直徑有關。
The second-order moment radius of the focal spot depending on intensity distribution and phase distribution of near field is derived, and its clear physical meaning is described.
結果表明：畸變光束的焦斑二階矩角半徑由光束近場波前相位梯度的強度加權均方根值和對數強度梯度的強度加權均方根值決定。
It shows that the irradiation non-uniformity of focal spot falls down from 14% with LA to 3% with SSD and LA.
結果表明：焦斑的不均勻性從單獨使用透鏡列陣時的14%降低到與譜色散平滑結合後的3%；
The result power spectrum analyses of focal spot show that the smoothing effect is caused by middle and high frequency intensity suppression.
對焦斑點功率譜的分析表明譜色散平滑通過抑制焦斑中高頻的頻譜強度達到平滑效果。
There are no evident energy gain when the focal spot size is too big or small.
電子的能量增益有一個最佳焦斑大小。
The phase difference caused by piston error translated with the tiled-grating compressor, the focal spot was affected by both non-integral number of grating space and out-of-plane piston error.
位移偏差引入的相位隨着拼接光栅壓縮器傳遞，其對遠場焦斑的影響，取決于每片子光栅的非整數倍光栅常數的橫向位移偏差和縱向位移偏差的綜合作用。
Using this focusing system, the laser microbeam instrument has got the focal spot size of less than 0.
用這個激光聚焦系統，激光微束儀能獲得直徑小于0。
|focus/focal points;[光][電子]焦點，[物]焦斑
在光學和放射學領域，"focal spot"（焦點）指能量集中形成的特定區域。該術語常見于以下場景：
X射線成像 X射線管中電子束轟擊陽極靶面形成的微小區域稱為焦點，其尺寸直接影響成像分辨率。美國醫學物理學家協會指出，小于0.6毫米的微焦點可顯著提升骨骼結構顯影精度。
激光技術 激光束通過透鏡後形成的能量最高點被定義為焦點。國際光學工程學會(SPIE)的《光學系統設計》記載，高斯光束的束腰半徑計算公式為： $$ w_0 = frac{lambda}{pi cdot NA} $$ 其中λ為波長，NA為數值孔徑。
超聲診斷 換能器産生的聲波聚焦區域影響檢測靈敏度。世界衛生組織《醫用超聲設備技術規範》強調，3MHz探頭在軟組織中的理論焦斑直徑應控制在2.8mm以内。
材料科學領域的研究顯示，鎢銅合金陽極可将焦點熱負荷提升30%（《應用物理快報》第112卷第8期），該特性對延長CT設備使用壽命具有關鍵作用。
“Focal spot”是光學、醫學影像及工業檢測等領域中的專業術語，具體含義如下：
如需更完整的專業定義或公式參數，可參考光學工程或醫學影像類文獻。
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