荧光显现在指纹拍照中的滤光镜选择

摘要

Some of the trace evidence can’t be seen under common light and even under ultraviolet( UV) excitation, but we can use fingerprint fluorescent paint because the adsorption capacity of illuminative fingerprint powder on fingerprint is larger than that on the object surface. Therefore, under the UV light source excitation, when using the digital camera to take pictures of objects, whether to use UV lens or not, combined with UV lens exposure as well as choosing a single pass filter to record fingerprint to make optimal shooting under the background of ultraviolet light excitation and fluorescence, becomes a meaningful research topic.%　　有些在普通光线，甚至紫外线激发下看不清或看不见的痕迹物证，利用荧光指纹粉末在指纹上的吸附能力大于客体表面的吸附能力，进行指纹荧光粉刷显，并利用荧光指纹粉末在长波紫外线下有较强的荧光性质。因此，在紫外光源激发下，利用数码相机拍摄物体时，能否使用UV镜，使用在紫外光源激发下有荧光现象的滤光镜时，加用UV镜的曝光情况以及背景与痕迹在紫外光源激发下同时有荧光时，如何选择单通滤光镜来记录指纹使之成为最优的拍摄方法就成为极富意义的研究课题。