摘要
通过实验探讨了一种基于反斯托克斯效应的红外激光纸币防伪新技术。在分析激光反斯托克斯荧光基本原理基础上,搭建了波长可调红外激光器测试纸币反斯托克斯荧光实验系统,完成分析最佳受激波长实验;基于980nm红外激光辐射防伪窗口,利用数码相机对真假币完成成像对比实验。实验结果表明,激光辐照下,真币在640～670nm、530～560nm波段分别有受激辐射峰值,而假币没有;10、20、50、100元不同币值的纸币受激发的波长都相近;利用数码相机拍红外激光辐照的图像时,加上特定波段的滤光片可以很好地实现真假币的防伪识别。实验结果验证了基于反斯托克斯效应的红外激光纸币防伪技术是可行的,同时为验钞防伪系统提供了借鉴。
A new method to identify the counterfeit note based on anti-Stokes effect of infrared laser by experiment is mainly discussed. Under the fundamental of analyzing the basic principles of anti-Stokes effect of infrared laser, an experimental system with tunable infrared laser to measure the anti-Stokes effect of band notes is set up and the experiment of optimum stimulated emitted light-wavelength analysis is finished; the 980 nm infrared laser is used to irradiate the anti-counterfeit windows of the real note and the counterfeit one, and the comparative study of their stimulated emitted light images using CCD is completed. The results of this experiment show that： Under the irradiating of laser, the real note can emerge stimulated emitted light with two wave crests around 640-670 nm and 530-560 nm, respectively, while there is nothing coming up on the counterfeit note; The wavelength of stimulated emitted lights for 10, 20, 50 and 100 yuan RMB are nearly the same; It is effective in identification of the counterfeit note to add an optical filter when the phenomenon is recorded by photographing using CCD. The results of the experiment prove that the technology on identify of counterfeit note based on anti-Stokes effect of infrared laser is feasible, meanwhile, it provides lessons for anti-counterfeit system of note.
出处
《激光与光电子学进展》
CSCD
北大核心
2012年第11期146-150,共5页
Laser & Optoelectronics Progress
基金
国防科学技术大学校级资助课题
关键词
激光光学
纸币防伪
反斯托克斯效应
受激发波长
laser optics
anti-counterfeiting banknote
anti-Stokes effect
stimulated emitted light
