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近年来,我们在利用公安部第二研究所生产的2301N型静电压痕显现仪进行教学、科研和办案时,对显现出的静电压痕图像的提取技术进行了研究并取得了一些进展。通过多次对已显现出的静电压痕图像进行提取,我们发现用宽幅透明胶纸提取时,由于幅面太宽,胶膜互相粘连或因提取时用力不均,极易产生皱折或气泡,影响检验。此外,检材纸张本身的颜色、图案及字迹等因素,直接影响了聚脂膜上已显现出的静电压痕图像的观察和拍照,为此我们尝试用市售感光材料或“即可贴”不干胶纸等对其进行提取,获得了满意的效果。
In recent years, when we used the 2301N electrostatic indentation instrument produced by the Second Institute of Ministry of Public Security to conduct teaching, scientific research and case handling, we made some researches on the extraction technology of electrostatic indentation images and made some progress. By extracting the electrostatic indentation image that has appeared many times, we find that when the paper is extracted with a wide-width transparent adhesive tape, the width is too wide, the adhesive films are stuck to each other or the force is unevenly distributed during the extraction, wrinkles or bubbles are easily generated Impact test. In addition, the test paper itself, the color, pattern and writing and other factors, has a direct impact on the polyester film has been observed on the electrostatic indecent image observation and photographing, for which we try to use commercially available photographic materials or “can be affixed” Self-adhesive paper, such as its extraction, obtained satisfactory results.