spectrum n. (pl. -tra ) 1.【物理學(xué)】譜,光譜;波譜;能譜,質(zhì)譜。 2.【無線電】射頻頻譜;無線電(信號(hào))頻譜。 3.【心理學(xué)】(眼睛的)余像;殘像。 4.〔轉(zhuǎn)義〕范圍,幅度;(連續(xù)的)系列。 an absorption spectrum 吸收(光)譜。 a bright line spectrum 線狀光譜。 an optical spectrum 光譜。 a solar spectrum 太陽光譜。 a wide spectrum of opinion 意見的不同幅度甚大。
Angular spectrum and application in diffraction 角譜及其在衍射中的應(yīng)用
P - polarized reflectance ratio angular spectra of surfaces and its application 偏振光雙表面反射比的角譜及其應(yīng)用
The angular spectrum method of plane electromagnetic wave propagation gives another explanation for wave propagation 摘要平面電磁波傳播的角譜法,提供了波的傳播過程的另一種解釋。
When diffraction problems are solved by the angular spectrum theory , high speed and high accuracy can be obtained , especially for near - field fresnel diffraction 用角譜理論來處理衍射光場(chǎng),不僅速度快,而且在處理近場(chǎng)菲涅耳衍射光場(chǎng)時(shí)的準(zhǔn)確度是其它方法無法比擬的。
Firstly , this article introduces the transforming principle and means from airspace to angular spectrum space , then it calculates square hole diffraction , at last it compares the theoretical calculation with the experimental result , which turns out to be good and fit 本文首先介紹了由空域到角譜域的變換原理和方法,然后對(duì)方孔衍射作了計(jì)算,并同實(shí)驗(yàn)結(jié)果作了比較,結(jié)果表明兩者十分吻合。
The results show that , as for the single - mode transmission , the dispersion relations yet include space - dispersion ( k dispersion ) which relates to angular spectrum of fields of in - waveguide , in addition to the material - dispersion and the waveguide - dispersion 分析結(jié)果表明:對(duì)于單模傳輸,色散關(guān)系中除了與頻率有關(guān)的材料色散和波導(dǎo)色散外,還應(yīng)包括與輸入端光場(chǎng)的角譜有關(guān)的空間色散( k色散) 。
A perturbation method by tight - binding approximation which provide the relation of phase constant and angular spectrum of fields of in - waveguide is presented . the strip width of phase constant can be given . on the other hand , the group delay - time due to the k dispersion in single - mode transmission can also be estimated 提出一種利用緊束縛近似的微擾法計(jì)算陣列波導(dǎo)的相位常數(shù)與輸入光角譜的關(guān)系,由此算出相位常數(shù)的帶寬,并利用衍射方法估算單模傳輸中k色散引起的群延時(shí)。