磁控溅射镀锌法显现潜手印初探

Latent Fingerprint Development by Magnetron Sputtering of Zn Films

介绍了一种利用磁控溅射镀锌技术显现潜手印的新方法。考察了磁控溅射镀锌法适合显现的手印遗留客体的种类、颜色,不同遗留时间对显现效果的影响,以及手印显现率。结果显示,磁控溅射镀锌法较适于显现深色客体上的手印,且客体颜色越深,显现效果越好。对于塑料、铜版纸、铝合金、玻璃等客体上的手印有较好的显现效果,但橡胶和人造革类上的手印则无法很好显现。此外,遗留一个月内的陈旧手印显现效果均比较理想,遗留三个月的手印显现也可显出,但效果有所下降。因此,磁控溅射镀锌法对于光滑、非渗透性或半渗透性深色客体表面的新鲜和陈旧的潜手印均有理想的显现效果。

The latent fingerprints left on surfaces of various materials are developed by magnetron sputtering of Zn films. The impacts of various factors, including the species, color and shade of surfaces, and the time when the fingerprint was left, the latent fingerprint development were also evaluated. The results show that the sputtered Zn films work well to develop the fresh latent fingerprint on smooth, compact, dark, solid surfaces, such as the surfaces of hard plastics, glasses, ceramics, coated paper, and aluminum alloys; but fail to develop the fingerprint on materials, such as rubber, leather and artificial leather; and that the darker the object, the better the image. Moreover, good images were obtained for the fingerprint left less than one month, but very poor images for the three-month old ones. The advantages over the conventional vacuum metal deposition technique were also tentatively discussed.