Application Example of SEM and Infrared Spectroscopy in Fiber Evidence Analysis
There are many types of fibers,many of which are the basic units that make up textiles.Textiles are closely related to people's daily lives and widely used,with fibers often appearing at crime scenes and becoming one of the most common physical evidence.There are many methods for identifying fibers using instruments and equipment,including microscopy,infrared spectroscopy,Raman spectroscopy,and microscopic spectrophotometry.This article describes the experimental process of using scanning electron microscopy and infrared spectroscopy in a traffic accident judicial appraisal case to compare the consistency between the fabric fragments taken from the person's jacket and the fibers taken from two suspected vehicles.The microstructure of the fibers was analyzed using scanning electron microscopy,and the fibers were distinguished in appearance.The functional group structure of the fiber was analyzed using an infrared spectrometer,and the fiber type was determined.Based on the analysis results of scanning electron microscopy and infrared spectroscopy,the vehicle involved in the accident was ultimately identified.
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