热致荧光技术显现涂料墙面上汗潜手印的实验研究  

Experimental Study on Developing Latent Sweat Fingerprints on Painted Wall by Heat-induced Fluorescence Technology

作　　者：李孝君 孙威 LI Xiaojun;SUN Wei(Institute of Forensic Science,Ministry of Public Security,Beijing 100038,China;People’s Public Security University of China,Beijing 100038,China)

机构地区：[1]公安部鉴定中心,北京100038 [2]中国人民公安大学,北京100038

出　　处：《刑事技术》2023年第5期489-497,共9页Forensic Science and Technology

基　　金：公安部科技强警基础工作专项(2020GABJC16)。

摘　　要：热致荧光是一种无需化学试剂就能显现出渗透性客体上汗潜手印的专业技术,显现涂料墙面上汗潜手印是该技术非常必要的应用延伸。因此本文重点探究了涂料墙面上汗潜手印热致荧光显现方法的反应机理,在此基础上以涂料墙面为承痕客体,逐步采用控制变量法研究了加热距离、时长、温度以及涂料种类、汗潜手印陈旧度对显现效果的影响。研究结果表明:涂料墙面上汗潜手印的最佳显现条件为加热距离15 cm、加热时长5 min、加热温度500℃,涂料种类不影响热致荧光技术显现墙面上汗潜手印的效果,时间较长的陈旧汗潜手印依然有良好的显现效果。该技术研究能够为刑事案件现场显现墙面上汗潜手印提供技术支持。Heat-induced fluorescence technology is a professional technology that can develop latent fingerprints on porous substrates without chemical reagents.Developing latent fingerprints on painted walls is a necessary application extension of this technology.Therefore,this paper focuses on exploring the reaction mechanism of the heat-induced fl uorescence method of the latent fi ngerprint on the painted wall.On this basis,taking the painted wall as the object of tracebearing,the influence of the heating distance,time length,temperature,coating type,and the aging degree of the latent fi ngerprint on the developing effect was gradually studied by using the control variable method.Finally,the best conditions of the latent fi ngerprint on the painted wall were obtained as follows:the heating distance of 15 cm,the heating time of 5 minutes,and the heating temperature of 500℃;the type of coating does not affect the effect of the heat-induced fl uorescence technology to develop the latent fingerprints on the wall,and the long-dated latent fingerprints still have a good result.Technical research can provide technical support for developing latent fi ngerprints on the wall at the scene of criminal cases.

关 键 词：汗潜手印 热致荧光技术 反应机理 涂料墙面 

分 类 号：D918.91[政治法律—法学]