论文部分内容阅读
对夹层全息用于信息的保密防伪进行了理论分析和实验研究,夹层全息对信息的编码有两种基本方法:一是使夹层全息再现的信息干涉相减,从亮的背景中显示出来,这要求夹层干版对位误差为波长量级,而实验所能达到的最小误差为40μm.因此这种编码方法必须有高精度的对位装置, 另一方法是使夹层全息再现的信息不干涉,从干涉条纹的背景中显示出来, 它要求夹层全息干版的对位误差小于240μm,在不需任何专门仪器的条件下即可实现,这种编码方法具有实用意义。
The theoretical and experimental studies on the security and confidentiality of mezzanine holographic information are carried out. There are two basic methods to encode information in mezzanine: one is subtracting the information reproduced by mezzanine from the bright background, The requirements of the sandwich version of the registration error on the order of the wavelength, and the experiment can achieve the minimum error of 40μm.Therefore, this encoding method must have a high-precision alignment device, the other method is to reproduce the sandwich holographic information does not interfere, From the background of the interference fringes, it shows that the registration error of the sandwich holographic plate is less than 240μm, which can be realized without any special instrument. This coding method is of practical significance.