硅胶仿生指纹膜印泥痕迹特征研究

目的研究硅胶仿生指纹膜印泥痕迹特征与真实指纹印泥痕迹特征的差异,为鉴定硅胶仿生指纹膜印泥痕迹提供依据。方法首先利用液态硅胶制作仿生指纹膜,然后用仿生指纹膜和手指在相同情况下蘸取印泥,分别以轻、中、重3种力度在A4纸上垂直按压形成印泥指印,并对其拍照提取,比较仿生指纹膜印泥痕迹与真实指纹印泥痕迹的特征差异。结果仿生指纹膜印泥痕迹多见“空白”“断裂”,边缘部分不规则、凹凸不平,小犁沟宽窄程度随力度变化明显,细节特征反映不清楚;真实指纹印泥痕迹自然、纹线较连贯。结论仿生指纹膜印泥痕迹特征与真实指纹印泥痕迹特征之间存在差异,根据两者之间的特征差异可以帮助鉴别仿生指纹膜印泥痕迹。

Characteristics of Marks Imprinted from Inked Silicone Biomimetic Fingerprint Film

Objective To discern the difference of characteristics between the imprinted marks from silicone bionic fi ngerprint fi lm and real fi nger so as to provide a basis for identifi cation of silicone bionic fi ngerprint impresses.Methods The bionic fi ngerprint fi lm was made with liquid silicone,having it pressed onto inkpad along with human real fi nger so that such two kinds of fi ngerprints were made onto A4 paper where both the silicone fi ngerprint fi lm and human fi nger were vertically impressed under three forces of small,moderate and intensive strength.The so-obtained two kinds of fingerprints were photographed and extracted,having their features and differences compared.Results The imprints from the bionic fi ngerprint fi lms were mostly seen of“blank”and“broken”signs,revealing irregular and uneven edges,having various breadths of small furrows with the pressing force strength changing yet no presence of distinct nuance.Real fi ngerprints showed natural and coherent lines.Conclusion There are differences between the characteristics of silicone bionic fi ngerprint fi lm impresses and real fi ngerprints,therewith capable of being used for identifi cation of silicone bionic fi ngerprint impresses.