IDenticoat500真空镀膜仪显现潜在手印优化条件研究
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摘要
目的本文基于IDenticoat500高真空镀膜仪探究了高真空镀膜技术显现潜在手印的优化条件。方法通过改变客体摆放位置、金的用量、真空度等显现条件,利用硬纸板、透明塑料袋、塑料胶带、复印纸等物品作为手印承痕客体,探究了各影响因素的优化显现条件。结果将客体放置在距离腔底部15cm、腔门4cm之间,首次镀金丝的长度不超过2mm,真空度优于2×10-4mbar时显现效果较好。结论该优化条件为更好地应用高真空镀膜技术显现潜在手印提供了参考。
Objective To investigate the optimal condition of developing latent fingerprints by vacuum metal depositor IDenticoat500. Methods Four kinds of substrates, cardboard, plastic bags, plastic tape and copy paper, were used to deposit the fingerprints. The optimized condition was explored on aspects of the locations of fingerprint-carrying substrates, the amount of gold used to coat, the degree of vacuum and others, those factors affecting the developing effects. Results On the conditions of the fingerprint-carrying substrates placing at about 15 cm from the bottom of the cavity and meanwhile 4 cm away from the door inside the IDenticoat500, the initially-deposited gold wire not longer than 2 mm, and the vacuum degree held at 2×10-4 mbar or even much lower, the fingerprints will be better developed. Conclusion The optimization may offer one reference for fingerprint to be developed by vacuum coating technology.
Objective To investigate the optimal condition of developing latent fingerprints by vacuum metal depositor IDenticoat500. Methods Four kinds of substrates, cardboard, plastic bags, plastic tape and copy paper, were used to deposit the fingerprints. The optimized condition was explored on aspects of the locations of fingerprint-carrying substrates, the amount of gold used to coat, the degree of vacuum and others, those factors affecting the developing effects. Results On the conditions of the fingerprint-carrying substrates placing at about 15 cm from the bottom of the cavity and meanwhile 4 cm away from the door inside the IDenticoat500, the initially-deposited gold wire not longer than 2 mm, and the vacuum degree held at 2×10-4 mbar or even much lower, the fingerprints will be better developed. Conclusion The optimization may offer one reference for fingerprint to be developed by vacuum coating technology.
引文
[1]HAMBLEY,D S.The physics of vacuum evaporation development of latent fingerprints[D].Royal Holloway,University of London,1972.
[2]KENT T,THOMAS G L,REYNOLDSON T E,et al.A Vacuum Coating Technique for the Development of Latent Fingerprints on Polythene[J].Journal of the Forensic Science Society,1976,16(2):93-101.
[3]JONES N,MANSOUR D,STOILOVIC M,et al.The influence of polymer type,print donor and age on the quality of fingerprints developed on plastic substrates using vacuum metal deposition[J].Forensic Science International,2001,123(1):5-12.
[4]李孝君,刘丹,王鸿飞,等.影响真空镀膜显现手印效果的因素分析[J].中国司法鉴定,2012(2):48-51.
[5]JONES N,STOILOVIC M,LENNARD C,et al.Vacuum metal deposition:factors affecting normal and reverse development of latent fingerprints on polyethylene substrates[J].Forensic Science International,2001,115(1-2):73-88.
[6]DAéID N.N,CARTER S,LAING K.Comparison of vacuum metal deposition and powder suspension for recovery of fingerprints on wetted nonporous surfaces[J].Journal of Forensic Identification,2008,58(5):600-613.
[7]LAM R,WILKINSON D,TSE T,et al.Recommended protocols for fingerprint detection on Canadian polymer banknotes-Part I:Chemical development[J].Journal of Forensic Identification,2014,64(4):375-401.
[2]KENT T,THOMAS G L,REYNOLDSON T E,et al.A Vacuum Coating Technique for the Development of Latent Fingerprints on Polythene[J].Journal of the Forensic Science Society,1976,16(2):93-101.
[3]JONES N,MANSOUR D,STOILOVIC M,et al.The influence of polymer type,print donor and age on the quality of fingerprints developed on plastic substrates using vacuum metal deposition[J].Forensic Science International,2001,123(1):5-12.
[4]李孝君,刘丹,王鸿飞,等.影响真空镀膜显现手印效果的因素分析[J].中国司法鉴定,2012(2):48-51.
[5]JONES N,STOILOVIC M,LENNARD C,et al.Vacuum metal deposition:factors affecting normal and reverse development of latent fingerprints on polyethylene substrates[J].Forensic Science International,2001,115(1-2):73-88.
[6]DAéID N.N,CARTER S,LAING K.Comparison of vacuum metal deposition and powder suspension for recovery of fingerprints on wetted nonporous surfaces[J].Journal of Forensic Identification,2008,58(5):600-613.
[7]LAM R,WILKINSON D,TSE T,et al.Recommended protocols for fingerprint detection on Canadian polymer banknotes-Part I:Chemical development[J].Journal of Forensic Identification,2014,64(4):375-401.