近红外光在深色渗透性客体上血迹发现中的应用  

Near-infrared Light Detecting Bloodstains on Dark Permeable Objects

作　　者：冯磊 蒋雪梅[1] 刘晋[1] 叶方坚 班茂森[1] FENG Lei;JIANG Xuemei;LIU Jin;YE Fangjian;BAN Maosen(Institute of Forensic Science,Ministry of Public Security,Beijing 100038,China)

机构地区：[1]公安部物证鉴定中心,北京100038

出　　处：《刑事技术》2022年第2期172-175,共4页Forensic Science and Technology

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(2019JB023)。

摘　　要：目的 利用近红外光在不同深色渗透性客体上发现不同浓度的微量血迹。方法 使用近红外光在黑色、青色和蓝色三种深色布料上分别寻找发现微量血迹,在黑色布料上分别寻找发现1∶1、1∶10、1∶20、1∶50的稀释微量血迹。结果 红外光照射后,血迹变暗,深色布料变亮,形成反差;深色布料上,能发现稀释20倍后的微量血迹。结论 利用近红外光快速发现犯罪嫌疑人遗留在深色渗透性客体上的血迹,对于案件的侦破往往起到关键作用。Objective To probe into near-infrared light about its detecting concentration-different trace bloodstains on various dark permeable objects. Methods The bloodstains were prepared on the patches of black, cyan and blue cloths, having the cloth-harboring bloodstain samples successfully made from dripping with concentration-differen blood fl uid(the undiluted blood for all cloths;the blood dilutions of 1:1, 1:10, 1:20 and 1:50 for the black cloth, only). Onto each of the cloth patches harboring bloodstains was the detection from near-infrared light for discovering the bloodstains. Results Under the infrared light, the bloodstains became obscure while the dark cloth turning brighter, hence having brought forth a contrast against the dark cloths among which the black one was able to unveil the trace bloodstains made from up to the 20-fold-diluted blood fl uid. Conclusions Near-infrared light is competent to detect trace bloodstains left from suspect at the crime scene, capable of quickening the detection of relevant case where the bloodstains on dark permeable objects are usually leaking out of discovery and diffi cult to detect, otherwise.

关 键 词：红外光 深色渗透性客体 血迹 

分 类 号：DF794.1[政治法律—诉讼法学]