After recording digital hologram with charge - coupled device ( ccd ) , we can reconstruct the real image of the object from it by means of numerical method 數(shù)字重現(xiàn)技術使用ccd代替干版直接記錄下菲涅爾全息圖,通過數(shù)字計算的方法再現(xiàn)物體的像。
( 7 ) numerical reconstruction of phase of light wavefront by perfect beam reflected by an imperfect mirror in digital hologram by ccd capturing . chai xiaodong ( the key laboratory of intelligent computing and signal processing , ministry of education ) 7 、對ccd獲取的鏡面反射物波波陣面的干涉全息圖,數(shù)字重構了其波陣面相位并給出了算法。
( 5 ) digital holograms of static particles and particle field ( multi - layer ) are recorded in the experiment . and the reconstructed particle images are gained using the envelope method with two different reconstructed waves - plane wave and spherical wave , respectively ( 5 )從實驗上拍攝了單層靜態(tài)粒子靶和多層靜態(tài)粒子靶的數(shù)字全息圖,并分別用平面波和球面波實現(xiàn)了該模擬粒子場的數(shù)值再現(xiàn),得到了清晰的粒子像。
( 1 ) basic mathematical model for recording and numerical reconstruction of digital hologram is elaborated . the core of digital holography is the algorithm of numerical reconstruction . two different approaches for numerical reconstruction of digitally sampled holograms are investigated , namely the fresnel transform algorithm and the frequency domain algorithm , which are deduced from the diffraction theory of spherical wave and plane wave respectively ( 1 )從理論上詳細闡述了數(shù)字全息圖記錄與再現(xiàn)的基本原理,建立了數(shù)字全息圖記錄和數(shù)值再現(xiàn)的數(shù)學模型,根據光波衍射的球面波和平面波理論,給出兩種不同的數(shù)值再現(xiàn)思路,即頻域再現(xiàn)法和菲涅耳變換法。