利用环形闪光灯拍摄汗潜指印的实验研究

Experimental Research on Photographing Latent Fingerprints Using Ring Flash

对于非渗透性光滑表面上的汗潜指印显现,传统的是使用粉末显现法、"502"熏显法和短波紫外线照相法等方法显现和提取,这些方法都是有损或准无损检验方法。环形闪光灯作为一种照相光源,既有闪光灯的特点,又有环形灯的特性,用它照明拍摄非渗透性光滑表面的汗潜指印是一种光学显现法,也是一种无损检验方法,在显现和提取过程中是一种首选方法。实验证实,利用环形闪光灯照明拍摄汗潜指印,可以获得其他光源无法得到的显现效果。根据环形闪光灯显现汗潜指印的原理,它同样也适用于遗留在非渗透性光滑表面上其他较小痕迹物证的显现和提取,这对基层刑事现场勘验工作具有一定的应用价值。

Usability of ring flash in photographing latent fingerprints were investigated on impermeable smoothing surfaces in this work. Latent fingerprints were photographed on various smoothing surfaces with ring flash. The relationship between development results and other factors is analyzed. Based on its fundamental,the ring flash was expected to be usable for other trace evidence on impermeable smoothing surfaces. This practice was particularly valuable in routine caseworks in criminal investigation.