显微分光光度计分析文件中印章与签字形成的时序

Abstract

本实验主要采用显微分光光度计分析书写字迹与印章形成的时序，结合显微照相技术拍取文件的二维照片，运用透射光谱法对时序不同的文件进行检测，分别探讨了黑笔与蓝笔形成文件的先后顺序特征，并将文件正面与反面检测方式作了比较。实验结果表明，采用显微透射光谱法，时序不同的样品在400~750nm透射率不同，朱墨交叉处与白纸、印泥、书写色料的色差值大小不同，结合样品照片的特征比较，可将其有效的区分。该法快速、准确、不损坏样品，能够有效鉴别黑笔或蓝笔与印章形成文件的时序。 The time sequence of writing and seal formation was analyzed by microspectrophotometer, and the time sequence of different files was detected by using the transmission spectrum method in this experiment. Experimental results showed that the transmissions of samples from different time could be detected between 400 and 750nm. The values of the red seal mixed with the ink, the white paper and the writing pigment color were different. Compared with the characteristics of the sample photos, they could be distinguished effectively. The method was effective, accurate and was harmless to the samples. The time sequence of black pen or blue pen and seal formation could be identified effectively with the method.