Abstract:

Objective The application of vacuum metal deposition in the development of latent fingerprints was investigated. Methods Factors affecting the developing result， including the spraying distance， the amount of gold， the hanging position of the objects， the current and time of the zinc evaporation were studied. Results With optimized conditions， the three-dimensional ridges were enhanced， and the distribution of gold and zinc film between hand ridges and background were improved， which increased the contrast of the latent fingerprints. Conclusion The best conditions to develop latent fingerprints by vacuum metal deposition are determined.

Key words: vacuum metal deposition, development of latent fingerprint, optimization

摘要：

目的 考查真空镀膜技术在手印显现方面的应用。方法 从影响真空镀膜法显现手印的因素展开，重点分析了喷镀距离、金的用量、客体悬挂角度、锌的蒸发电流和时间等对手印显现的影响。结果 条件优化后可以增强手印纹线的立体感，改善金膜、锌膜在手印纹线和客体背景的分布情况，使显出的手印纹线反差明显。结论 确定真空镀膜显现常见非渗透性客体上汗潜手印的最佳操作条件。

关键词: 真空镀膜, 手印显现, 条件优化