激光全息防伪标识参数测量方法  

Method of Measuring Parameters of Laser Holographic Labels for Anti-Counterfeit

作　　者：孟卓[1] 刘铁根[1] 江俊峰[1] 何瑾[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室,天津300072

出　　处：《纳米技术与精密工程》2007年第3期173-176,共4页Nanotechnology and Precision Engineering

摘　　要：针对激光全息防伪标识的重要光学特性参数中衍射效率和信噪比的测试要求,提出了一种简便、可靠的自动测量方法.通过采用步进电机驱动的丝杠传动带动样品进行一维位移扫描,大光敏面的光电探测器将光强转化为电压信号,计算机采集并获得扫描时的光强分布曲线,通过对该曲线计算分析可得到标识的衍射效率及信噪比.A simple and credible method was proposed to measure the diffraction efficiency and SNR of laser holographic labels for anti-counterfeit automatically. The stepper motor drives the lead screw for scanning the label of one dimension, while the photoreceiver with wide photosensitive area transforms optical intensity signals into voltage signals. The diffraction efficiency and SNR of the label can be obtained by analyzing and computing the curve of the optical intensity via the computer.

关 键 词：全息防伪 彩虹全息 衍射效率 信噪比 

分 类 号：TB481[一般工业技术—包装工程]