TFD-2显现常见纸张上汗潜手印实验

Sweat Handprint Experiments on TFD-2 Common Objects

为了探索TFD-2纸张快速显现系统适用的纸张类型以及对常见纸张上汗潜手印最佳显现效果的设置参数和操作次数,选用A4纸、发票、笔记本内页纸、报纸、彩色印刷品、卫生纸、人民币这7类常见纸张客体作为研究对象,利用TFD-2纸张快速显现系统对纸张客体进行热成像处理,对显现出来的手印分别比较观察,拍照固定。实验结果表明,对TFD-2的操作应首先以2000mm/min流速进行,依次逐步递减,多数纸张客体操作2次效果最佳,不宜超过3次。TFD-2纸张快速显现系统适用的纸张范围广,操作简便快捷,灵敏度高,对卫生纸和人民币这些较为疑难的客体均有不错的显现效果。

seven kinds of common paper objects were selected as research subjects, including the A4 paper,invoices,notebook pages, newspapers, color prints, toilet paper and Renminbi, to explore the best parameter settings and the num-ber of operations for the paper suitable for TFD-2. The objects were treated with thermal imaging making use of the TFD-2 paper rapid imaging system, and the displayed handprints were compared, photographed and fixed. The Experimental re-sults show that the operation of TFD-2 should first be carried out at a flow rate of 2000 mm/min, and gradually decrease in order. The majorities of paper objects have the best effects with twice operation, and no more than 3 times. The TFD-2 paper rapid imaging system has some virtues, such as, a wide range of applicable objects, easy and quick to operate,high sensitivity and with a good effect on the difficult objects such as toilet paper and RMB.