通过沉积柱状薄膜和荧光染料处理增强指纹可视化。
Fingerprint visualization enhancement by deposition of columnar thin films and fluorescent dye treatment.
机构信息
Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India.
出版信息
Forensic Sci Int. 2013 May 10;228(1-3):32-7. doi: 10.1016/j.forsciint.2013.02.018. Epub 2013 Mar 8.
Enhanced visualization of latent fingerprints on two non-porous surfaces, smooth glass slides and highly reflecting rough aluminum sheets, is obtained by depositing columnar thin films (CTFs) of calcium fluoride (CaF2) and silica (SiO2) by physical vapor deposition at large oblique angles. Due to the vapor flux getting shadowed by the physical residues in the fingerprints, the CTFs are deposited only on the upraised ridges, resulting in highly enhancing the visibility of the fingerprint. The visualization of these fingerprints with deposited CTFs is further enhanced by subsequently treating them with a fluorescent dye and fluorescence imaging. A specific amino-acid reagent (1,2-indanedione) and non-specific laser dye (Rhodamine 6G), both allowed enhanced visualization of the CTFs grown on the fingerprints, due to the localization and entrenchment of the dye within the CTF regions.
通过在大倾斜角下进行物理气相沉积，在两个非多孔表面（光滑玻璃载玻片和高反射粗糙铝板）上沉积柱状薄膜（CTF）的方法，可以增强对潜伏指纹的可视化效果，这些 CTF 由氟化钙（CaF2）和二氧化硅（SiO2）组成。由于蒸气通量被指纹中的物理残留物遮挡，因此 CTF 仅沉积在凸起的脊上，从而极大地提高了指纹的可见度。通过随后用荧光染料和荧光成像对这些沉积 CTF 的指纹进行处理，进一步增强了指纹的可视化效果。由于染料在 CTF 区域内的定位和固定，特定的氨基酸试剂（1,2-茚二酮）和非特异性激光染料（若丹明 6G）都允许增强对在指纹上生长的 CTF 的可视化效果。
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