粗糙纸张上尿渍足迹的激光检验  

Laser Examination of Urine Footprints on Rough Paper

作　　者：魏科 陈壮 郝丁成 李超 Wei Ke;Chen Zhuang;Hao Dingcheng;Li Chao(Judicial Police Academy(Public Security Branch),Gansu University of Political Science and Law,Lanzhou 730070,Gansu,China;Xigu Branch of Lanzhou Public Security Bureau of Gansu Province,Lanzhou 730060,Gansu,China;Department of Public Security,Railway Police College,Zhengzhou 450053,Henan,China)

机构地区：[1]甘肃政法大学司法警察学院(公安分院),甘肃兰州730070 [2]甘肃省兰州市公安局西固分局,甘肃兰州730060 [3]铁道警察学院治安学系,河南郑州450053

出　　处：《应用激光》2023年第6期110-123,共14页Applied Laser

基　　金：甘肃政法大学2020年“引才专项项目”(gszf2020xyc019);甘肃政法大学2022年度校级科研创新项目(GZF2022XQN03)。

摘　　要：探索利用可见激光无损提取粗糙纸张上尿渍足迹的可行性,定量比较足迹显现效果。利用3种可见激光,配合使用11种可见波段滤光镜,对4类20种常见类型纸张上的尿渍足迹样本进行可见激光荧光照相,观察足迹显现效果;创建Matlab程序,引入灰度荧光亮度标准差指标比较足迹显出程度。发现20个尿渍足迹样本显现效果最好时的波段组合几乎各不相同,但可利用445 nm蓝色激光作为激发光,配合使用570 nm接收滤光镜,对所有样本的尿渍足迹进行整体最大程度的显现,样本尿渍足迹发现率100%;除黑色打印纸、复杂彩色背景报纸上的尿渍足迹样本外,样本尿渍足迹有效显出率90%。表明可见激光荧光照相能够用来显现粗糙纸张上的尿渍足迹,灰度荧光亮度标准差可以用来衡量尿渍足迹显出程度。This paper explores the feasibility of non-destructive extraction of urine footprints on rough paper by visible laser and quantitatively comparing the effects of footprint development.Three kinds of visible lasers and 11 kinds of visible band filters were used to take visible laser fluorescence photography of urine footprints on 4 categories of 20 kinds of common types of paper to observe the effect of footprints.The Matlab program was created,and gray-scale fluorescence luminance standard deviation index was introduced to compare the degree of footprint visualization.The study found that the band combinations of the 20 samples with the best development effect were almost different,but the 445 nm blue laser was used as the excitation light,and the 570 nm receiving filter was used to develop the urine footprints of all samples to the maximum extent,the detection rate of urine footprints was 100%.In addition to the urine footprint samples on black printer paper and newspaper with complex color background,the effective visualization rate of urine footprint samples was 90%.The results show that visible laser fluorescence photography can be used to visualize urine footprints on rough paper,and the standard deviation of gray-scale fluorescence luminance can be used to measure the degree of urine footprints development.

关 键 词：可见激光荧光照相 粗糙纸张 尿渍足迹 无损提取 灰度荧光亮度标准差 

分 类 号：O436[机械工程—光学工程]