面向多光谱掌纹图像采集系统的光学薄膜滤光片设计  

Design of Optical Thin-Film Filters for Multispectral Palmprint Image Acquisition Systems

作　　者：于志强 费书国 赵帅锋[2] 郭志帅[2] Yu Zhiqiang;Fei Shuguo;Zhao Shuaifeng;Guo Zhishuai(School of Information Science and Engineering,Shenyang University of Technology,Shenyang,Liaoning 110870,China;Shenyang Academy of Instrumentation Science Co.,Ltd.,Shenyang,Liaoning 110043,China)

机构地区：[1]沈阳工业大学信息科学与工程学院,辽宁沈阳110870 [2]沈阳仪表科学研究院有限公司,辽宁沈阳110043

出　　处：《光学学报》2021年第23期253-260,共8页Acta Optica Sinica

摘　　要：设计了一组应用于多光谱掌纹图像采集系统的光学薄膜滤光片。根据手掌皮肤在可见、近红外光谱波段反射率不同的特点,研究了掌纹识别滤光片的光谱特性参数及膜系设计。为提高系统获得的掌纹图像质量,采用四通道滤光片设计方案,光谱特性参数要求如下:中心波长为λ_(1)=470 nm、λ_(2)=520 nm、λ_(3)=630 nm、λ_(4)=880 nm;各通道的半宽度在8~12 nm范围内,透射率大于90%,平均截止背景深度大于OD6(即光谱透射率T<10^(-6))。Optical thin-film filters for multispectral palmprint image acquisition systems were designed.According to the different reflectance characteristics of palm skin in visible and near-infrared bands,we analyzed the spectral characteristic parameters and film design of palmprint recognition filters.For better quality of palmprint images obtained by the systems,a four-channel filter design scheme was adopted.The spectral characteristic parameters are required as follows:the central wavelengths λ_(1)=470 nm,λ_(2)=520 nm,λ_(3)=630 nm,and λ_(4)=880 nm.The full width at half maximum of each channel is 10 nm.The transmittance is higher than 90%,and the average cut-off background depth is greater than OD6(spectral transmittance is less than 10^(-6)).

关 键 词：薄膜 光学薄膜 多光谱掌纹图像采集 滤光片 光谱特性参数 膜系设计 

分 类 号：TN929.11[电子电信—通信与信息系统]