Akiba Norimitsu, Saitoh Naoki, Kuroki Kenro, Igarashi Naoaki, Kurosawa Kenji
Physics Section, Second Forensic Science Division, National Research Institute of Police Science, 6-3-1 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan.
J Forensic Sci. 2011 May;56(3):754-9. doi: 10.1111/j.1556-4029.2011.01732.x. Epub 2011 Mar 1.
Laser detection of latent fingerprints on a white paper has been performed, previously. Ultraviolet fluorescence from various kinds of printer toner and ink used for home printers were measured to study fluorescence imaging of fingerprints on a color-printed white paper. The experimental system consisted of a nanosecond pulsed tunable laser and a cooled CCD camera. Excitation wavelengths are 230 and 280 nm. Fourteen printers consisting of three color laser printers, three color inkjet printers, five monochrome laser printers, two monochrome copy machines, and a color copy machine were tested. Toner and ink of most printers exhibited fluorescence in the region from 360 to 550 nm. In most cases, clear fluorescence images were obtained by time-resolved imaging with a band-pass filter and 280-nm excitation. However for toners from laser color printers that showed strong fluorescence, better results were obtained with 230-nm excitation. Latent fingerprints on a photograph page and a black-character page of a newspaper were also imaged.
此前已进行过用激光检测白纸上的潜在指纹。测量了家用打印机使用的各种打印机碳粉和墨水的紫外荧光，以研究彩色打印白纸上指纹的荧光成像。实验系统由一台纳秒脉冲可调谐激光器和一台冷却的电荷耦合器件相机组成。激发波长为230和280纳米。测试了14台打印机，包括3台彩色激光打印机、3台彩色喷墨打印机、5台单色激光打印机、2台单色复印机和1台彩色复印机。大多数打印机的碳粉和墨水在360至550纳米区域呈现荧光。在大多数情况下，通过带通滤波器和280纳米激发进行时间分辨成像可获得清晰的荧光图像。然而，对于显示出强荧光的激光彩色打印机的碳粉，用230纳米激发可获得更好的结果。还对照片页面和报纸黑字页面上的潜在指纹进行了成像。
