钞票防伪技术.pptxVIP

Butterfly Inspires Banknote Authentication Tech光电信息工程 许海涛一、伪造产品带来的危害二、介绍当代钞票的防伪技术三、由大闪蝶翅膀引发的钞票防伪技术In Canada alone, businesses lose an estimatedhalf-billion dollars a year from counterfeiting.Counterfeiting has been described by the FBI as the crime of the 21st century. According to the International Anti-Counterfeiting Coalition Inc., a Washington, DC based nonprofit organization, counterfeiting is a $600 billion a year problem worldwide, with US businesses alone suffering up to $250 billion in unnecessary costs each year.伪钞的危害 大量伪钞流通可能导致经济问题，例如通胀。在交易中收到伪钞者会损失伪钞所标面值的金钱。　伪钞氾滥不仅危及国内经济、扰乱社会经济秩序，影响人民生计，更是有损我国法定货币人民币的地位尊严光学应用于钞票防伪的技术 一、水印是指在造纸过程中形成的，“夹”在纸中而不是在纸的表面，迎光透视时可以清晰看到有明暗纹理的图形、人像或文字，它是纸张在生产过程中用改变纸浆纤维密度的方法而制成的。二、光变油墨 是用光变油墨印制的，视角改变过程中色彩渐变。而假钞制作时无法得到这种特别的光变油墨，不会变色。三、隐形油墨在普通光源下无色荧光油墨为无色透明或接近白色。印在纸张或塑料薄膜上不显颜色。在紫外光下不同品种会显出不同的颜色，有红、黄、绿、蓝、白、橙、紫等颜色。反射日光的翅膀 大闪蝶使用它蓝色翅膀向它的同伴发送信号。翅膀上充满斑斓的色彩，是鳞粉上排列整齐的次微米结构，用自然色素吸收太阳光并作为萤光发射较长的波长，指吸收光谱的蓝色到蓝绿色波段。蝴蝶的可视系统与这种颜色相合，选择性的反射日光的结果。?在显微镜下，鳞粉的表面有孔穴的出现，形成孔状，从顶部到底部形成粗糙的六角形的柱状管。 两位研究者计算蝴蝶翅膀鳞粉的光子晶体能精确地阻挡色素分子发射。这个建议说明孔状结构已经发展成直接向外反射光，阻止将光线吸收进翅膀里，他们将此项报告发表在科学杂志上。The company’s master shim is customizable in size from microns to centimeters. On the shim stand tens to hundreds of millions of nanoscale pillars, and from this master, multiple shims can be manufactured. By imprinting these shims into a material, the pillars emboss a grid of nanoscale holes that trap light and release color.“Proving that our technology can be recreatedsuccessfully with the use of a mastershim was a crucial step in making it availablefor commercial use to our potential partners,”said Doug Blakeway, CEO of NTS. “This milestone makes our technology accessibleand affordable to banknote manufacturers, while allowing them to maintain the highestlevel of security they require.”Because it requires highly specialized equipment in the tens of millions of dollars,patented algorithms and extensive scientific expertise to replicate the uniquenanostructures, the company said its na