针对生物特征的多模识别技术，设计了一款用于指纹及手指静脉图像复合采集的光学系统。用于采集指纹和手指静脉图像的光学镜头分别由3片和12片球面透镜构成，工作波长分别为650 nm和850 nm，成像器件分别采用640 pixel×480 pixel CCD和640 pixel×512 pixel非制冷红外探测器。使用Zemax软件对该系统的光学结构进行了设计和优化。像质评价结果表明: 指纹图像采集镜头在空间截止频率67 lp/mm处，调制传递函数MTF值大于0.6；手指静脉图像采集镜头在空间截止频率30 lp/mm处，调制传递函数MTF值大于0.8；两镜头各视场弥散斑均方根半径远小于成像器件像元尺寸，接近衍射极限，且成像畸变均小于0.5%。实验证明该系统采集到的图像质量优良，分辨率高。

Due to the biological multi-mode identification technology,an optical system for compound acquisition of fingerprint and finger vein multiple images was designed and described.The optic camera for collecting fingerprint and finger vein images contains respectively 3 and 12 spherical lenses,which works at 650 nm and 850 nm wavelength with a 640×480 CCD and a 640×512 uncooled infrared(IR)detector as the imaging devices,respectively.With the aid of Zemax software,the optical system was designed and optimized to cause a good imaging quality. Image quality evaluation results show that the modulation transfer function(MTF)value of the fingerprint imaging lens is above 0.6 at 67 lp/mm,while the finger vein imaging lens is above 0.8 at 30 lp/mm.The view field spots root-mean-square (RMS) radii of the 2 lenses are both much smaller than the detectors pixel size,which are close to the diffraction limit,and the distortions are both less than 0.5%.Experiments prove that images acquired by this optical system have the merits of fine image quality and high resolution.