Experimental Study On The Sequential Identification Of Crossed Writings And Seal By Laser Confocal Scanning Microscope

At present,there are dozens of methods to identify the timing of ink and writing at home and abroad,mainly to observe the morphological characteristics and physical and chemical properties.This paper for the first time using laser confocal scanning microscopy on the cross section and adjacent parts of the sample,by measuring the thickness(depth).This measurement of the comparison method to identify the Zhu ink sequence,designed to provide a new way to identify the timing sequence.In this paper,we focus on the thickness of the ink,the thickness of the ink(oil),the depth of the writing pen and the influencing factors of the paper.At the same time,we research the laser print handwriting and the ink of the timing,and pen and inkpad timing.I collected six different brands of laser printers;three different brand of oil;two different signature pen.Firstly,we research the toner thickness,the thickness of the printing ink,the depth of the writing pen and influencing factors.Secondly,the experimental samples were prepared at two different timings,to prepare the laser prints and the pen test paper.The thickness of the cross section and the adjacent writing thickness(depth)were measured and stored every 4 months in the ordinary microscopic mode and the morphological observation,which lasted a total of 1 year.The experiment indicates that:(1)The paper as the carrier of the laser print graphic toner thickness measurement value is stabile within a certain width;As the width increases,the thickness of the toner becomes thinner;different brands of laser printers in the same width,has different measurement of the thickness.(2)the thickness of the printed ink printed on the paper can be measured,through the numerical comparison found that,the thickness of the ink> oilbased oil thickness> water-based oil thickness.(3)The depth of the signature pen can be measured,in the normal intensity of writing,the measurement depth in the range of 50 ?m-80?m fluctuation.(4)laser printing handwriting and ordinary ink and photosensitive ink in the timing of the judge,the first print after the stamp,cross the thickness of the measured value is greater than the adjacent toner thickness measurement;another situation,the measurements vary little.In the timing of the laser printing and inkpad the timing of judge,the samples made at different timings are larger than the measured values of the adjacent toner thickness,and the timing of the sequence can not be distinguished.(5)Signature pen writing and printing mud timing of the judge,the first write after the stamp,cross the depth of the strokes and adjacent parts of the depth of the difference between the depth of the drawing is very small,another situation,the cross the depth of the strokes are lighter than the adjacent parts of the depth.