far-field approximation 中文意思是什麼

far-field approximation 解釋
遠場近似
  • far : adj (farther further; farthest furthest )1 遠隔的;離得遠的,上遠路的,長途的。2 較遠的,遠處的...
  • field : n 菲爾德〈姓氏〉。n 1 原野,曠野;(海、空、冰雪等的)茫茫一片。2 田地,牧場;割草場;〈pl 〉〈集...
  • approximation : n. 1. 接近;近似。2. 【數學】近似值。3. 概算,略計。
  1. On the other hand, the electric field and intensity distributions of the he11 mode in the hollow fiber are calculated by using the exact solutions of maxwell equations based on the vector model, and the diffracted near - and far - field distributions of the he11 - mode output beam under the fresnel approximation are studies. we derive an analytical expression on the far - field distribution of the he n - mode output beam in free space and discuss its applicable condition. we also analyze and compare the differences between the he11 - and lp01 - mode output beams, and find that the near - field distribution of the lpoi - mode output beam is a gaussian - like one, but the near - field distribution of the he11 - mode output beam is a doughnut - like one, whereas the far - field distribution of both the lp01 - and he11 - mode output beams are a doughnut one

    此外,我們把中空光纖中lp _ ( 01 )模(標量模型)和he _ ( 11 )模(矢量模型)的場分佈以及它們各自的輸出光束的近場與遠場分佈進行了比較,發現兩種模式的輸出光束在近場分佈有很大的區別, lp _ ( 01 )模輸出光束在近場是一個高斯分佈,而he _ ( 11 )模輸出光束在近場是一個中空光束,在遠場兩種模式的輸出光束分佈是基本一致的,這正是由於在中空光纖中採用了弱波導近似以後所引起的誤差。
  2. Under the weakly guiding approximation, we derive the electric - field distribution of the lp01 mode in the hollow fiber. the far - and near - field distribution of the lp01 - mode output beam in free space is calculated numerically from fraunhofer and fressnel diffraction theory

    在弱波導近似下導出了中空光纖中lp _ ( 01 )模的電場分佈,數值推算了lp _ ( 01 )模輸出光束的遠場和近場分佈。
  3. In order to improve the efficiency, the fast far field approximation ( faffa ) and a novel local iteration technique based on dynamic coupling region controlling are applied to the original fipwa

    為進一步提高求解效率,將快速遠場近似與之混合;採用一種新型的動態控制耦合半徑的局部迭代技術。
  4. Far field approximation

    遠場結構
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