Montani Isabelle, Mazzella Williams, Guichard Marion, Marquis Raymond
Institut de Police Scientifique, Ecole des Sciences Criminelles, Batochime, Université de Lausanne, 1015 Lausanne, Switzerland.
J Forensic Sci. 2012 Jul;57(4):997-1002. doi: 10.1111/j.1556-4029.2012.02103.x. Epub 2012 Mar 5.
The determination of line crossing sequences between rollerball pens and laser printers presents difficulties that may not be overcome using traditional techniques. This research aimed to study the potential of digital microscopy and 3-D laser profilometry to determine line crossing sequences between a toner and an aqueous ink line. Different paper types, rollerball pens, and writing pressure were tested. Correct opinions of the sequence were given for all case scenarios, using both techniques. When the toner was printed before the ink, a light reflection was observed in all crossing specimens, while this was never observed in the other sequence types. The 3-D laser profilometry, more time-consuming, presented the main advantage of providing quantitative results. The findings confirm the potential of the 3-D laser profilometry and demonstrate the efficiency of digital microscopy as a new technique for determining the sequence of line crossings involving rollerball pen ink and toner.
确定滚珠笔与激光打印机之间线条交叉顺序存在困难，使用传统技术可能无法克服这些困难。本研究旨在探讨数字显微镜和三维激光轮廓测量法在确定碳粉与水性墨线之间线条交叉顺序方面的潜力。测试了不同的纸张类型、滚珠笔和书写压力。使用这两种技术，针对所有情况都给出了正确的顺序判断。当碳粉在墨水之前打印时，在所有交叉样本中均观察到光反射，而在其他顺序类型中从未观察到这种情况。三维激光轮廓测量法耗时更长，但其主要优点是能提供定量结果。研究结果证实了三维激光轮廓测量法的潜力，并证明了数字显微镜作为一种确定涉及滚珠笔墨水和碳粉的线条交叉顺序的新技术的有效性。
