Bond J W
Northamptonshire Police, Force HQ, Wootton Hall, Northampton NN4 OJQ, United Kingdom.
Rev Sci Instrum. 2009 Jul;80(7):075108. doi: 10.1063/1.3183578.
A newly developed method is presented for imaging fingerprint sweat corrosion of fired brass shell casings that reduces the degradation of the corroded fingerprint image. Degradation has been reduced by calculating a maximum angle of contact between the shell casing and a planar surface containing the imaging medium (graphite particles). Experiments have confirmed the predicted reduction in image degradation for contact angles less than the maximum. Details of the setup and operation of an instrument designed to improve fingerprint image quality are given and results shown for a 9 mm brass shell casing. Use of the instrument with other calibre ammunition is explained.
本文介绍了一种新开发的用于对发射过的黄铜弹壳指纹汗液腐蚀进行成像的方法，该方法可减少腐蚀指纹图像的退化。通过计算弹壳与包含成像介质（石墨颗粒）的平面之间的最大接触角，减少了图像退化。实验已证实，对于小于最大接触角的情况，图像退化如预期那样减少。文中给出了为提高指纹图像质量而设计的仪器的设置和操作细节，并展示了9毫米黄铜弹壳的结果。还解释了该仪器用于其他口径弹药的情况。
