Akiba Norimitsu, Saitoh Naoki, Kuroki Kenro
Second Forensic Science Division, National Research Institute of Police Science, 6-3-1 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan.
J Forensic Sci. 2007 Sep;52(5):1103-6. doi: 10.1111/j.1556-4029.2007.00532.x.
Fluorescence spectra of sebum-rich latent fingerprints were studied with a tunable laser for non-destructive fingerprint detection without chemical treatment. The tunable laser consists of a nanosecond pulsed Nd-YAG laser and an optical parametric oscillator (OPO) crystal. The fluorescence spectra and images were measured at various excitation wavelengths in the ultraviolet region by the time-resolved fluorescence method. We have previously reported that a typical fluorescence spectrum of fingerprints consists of two peaks located at c. 330 and 440 nm. In order to determine the wavelength of optimal excitation, excitation spectra were measured at wavelengths ranging from 220 to 310 nm. The fluorescence intensity of the 330 nm peak became maximal with excitation at 280 nm. The images of latent fingerprints on white papers were also measured and the clearest image was obtained with excitation at 280 nm. The influence of continuous irradiation on the fluorescence of fingerprints was measured at the optimal excitation wavelengths. The 330 nm peak was strong at first and decreased with continuous irradiation, whereas the 440 nm peak, which was weak at first, increased gradually.
利用可调谐激光器对富含皮脂的潜在指纹的荧光光谱进行了研究，以实现无需化学处理的无损指纹检测。可调谐激光器由纳秒脉冲钕钇铝石榴石激光器和光学参量振荡器（OPO）晶体组成。通过时间分辨荧光法在紫外区域的不同激发波长下测量荧光光谱和图像。我们之前曾报道，指纹的典型荧光光谱由位于约330和440 nm处的两个峰组成。为了确定最佳激发波长，在220至310 nm的波长范围内测量激发光谱。在280 nm激发时，330 nm峰的荧光强度最大。还测量了白纸潜在指纹的图像，在280 nm激发时获得了最清晰的图像。在最佳激发波长下测量了连续照射对指纹荧光的影响。330 nm峰起初很强，随着连续照射而降低，而起初较弱的440 nm峰则逐渐增加。
