Halahmi E, Levi O, Kronik L, Boxman R L
Electrical Discharge and Plasma Laboratory, Faculty of Engineering, Tel-Aviv University, Ramat-Aviv, Israel.
J Forensic Sci. 1997 Sep;42(5):833-41.
A novel technique for the development of latent fingerprints is presented. It is based on placing a fingerprint-bearing object inside a corona discharge induced plasma. The development of various real and artificial fingerprints on metallic substrates under a wide range of conditions is studied. Using the results of the development experiments and the results of X-ray photoelectron spectroscopy, it is shown that the development is based on oxidation of the fingerprint background. This is achieved by strong oxidizers generated by the discharge process, while saturated fatty-acids found in sebaceous fingerprints protect the area beneath them, resulting in a visible fingerprint. The process is optimized by minimizing the electrode gap distance and maximizing the peak discharge voltage and the pulse repetition frequency.
提出了一种用于显影潜在指纹的新技术。它基于将带有指纹的物体放置在电晕放电诱导的等离子体内。研究了在各种条件下金属基板上各种真实和人造指纹的显影情况。利用显影实验结果和X射线光电子能谱结果表明，显影基于指纹背景的氧化。这是通过放电过程产生的强氧化剂实现的，而皮脂腺指纹中发现的饱和脂肪酸会保护其下方的区域，从而形成可见指纹。通过最小化电极间隙距离、最大化峰值放电电压和脉冲重复频率来优化该过程。
