Seah L K, Dinish U S, Phang W F, Chao Z X, Murukeshan V M
School of Mechanical and Production Engineering, Nanyang Technological University, School of MPE, Nanyang Avenue, Singapore 639798, Singapore.
Forensic Sci Int. 2005 Sep 10;152(2-3):249-57. doi: 10.1016/j.forsciint.2004.09.121. Epub 2004 Nov 21.
Fluorescence study plays a significant role in fingerprint detection when conventional chemical enhancement methods fail. The basic properties of fluorescence emission such as colour, intensity and lifetime could be well exploited in the detection of latent fingerprints under steady state and in dynamic methods. This paper describes a systematic study of fluorescence emission intensity from fingerprint samples treated with different magnetic powders. Understanding of suitable excitation wavelength required for getting maximum fluorescence emission intensity could be beneficial when selecting the appropriate fluorescent powders for the fingerprint detection. Lifetime study of fingerprints treated with various magnetic powders was also carried out. The importance of lifetime study is well explained through the time-resolved (TR) imaging of fingerprints with nanosecond resolution. Results from the TR imaging study revealed an improvement in the fingerprint image contrast. This is significant when the print is deposited on fluorescing background and its emission wavelength is close to that of treated fingerprint.
当传统化学增强方法失效时，荧光研究在指纹检测中发挥着重要作用。荧光发射的基本特性，如颜色、强度和寿命，可以在稳态和动态方法下用于潜在指纹的检测。本文描述了对用不同磁性粉末处理的指纹样本的荧光发射强度进行的系统研究。在为指纹检测选择合适的荧光粉末时，了解获得最大荧光发射强度所需的合适激发波长可能会有所帮助。还对用各种磁性粉末处理的指纹进行了寿命研究。通过纳秒分辨率的指纹时间分辨（TR）成像很好地解释了寿命研究的重要性。TR成像研究的结果显示指纹图像对比度有所提高。当指纹沉积在荧光背景上且其发射波长与处理过的指纹的发射波长接近时，这一点很重要。
