摘要
数字全息是用CCD记录全息图并用计算机数值重建全息像的一种全息新方法.在数字全息中,通过对不同记录参数下记录的全息图的数值处理,可以消除零级光和共轭光,从而将数字全息系统看作是一个线性系统.本文依据全息理论和付里叶频谱分析,对菲涅尔数字全息系统的脉冲响应和分辨本领进行了理论分析.结果表明,在矩形等间隔抽样的情形下,菲涅尔数字全息的脉冲响应是由CCD有限大小的孔径衍射斑调制的矩形函数;菲涅尔数字全息的分辨率由CCD的孔径尺寸决定;由于CCD像素具有一定的大小,使得点光源的像发生弥散.
The digital holography is a new method of holography to replaced the hologram plate by a CCD array and to substitute for the optical reconstruction process by a numerical calculation of the complex wave field in the computer. In the digital holography, the zero-light and conjugate light can be eliminated by numerically processing the holograms of object with different recording parameters and the digital holography system can be interpreted as a linear system. In this paper, By use of the holographic theory and Fourier transform spectrum analysis, The impulse response and resolving power of Fresnel digital holography is presented. The results show： the impulse response is a rectangle function modulated by diffraction factor of the aperture defined by the CCD; The resolving power of Fresnel digital holography is defined by the aperture of the CCD; the image size of impulse function is defined by the size of the CCD pixel.
出处
《原子与分子物理学报》
CAS
CSCD
北大核心
2006年第3期583-586,共4页
Journal of Atomic and Molecular Physics
基金
甘肃省自然科学基金(3ZS051-A25-027)
关键词
数字全息
线性系统
脉冲响应
分辨本领
Digital holography, linear system, impulse response, resolving power
