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                            Library & Multimedia
 Magneto-Optical Sensors Bring Obliterated Serial Numbers Back to Life
NCJ Number
              248776
Journal

*NIJ Journal* Issue: 275 Dated: May 2015 Pages: 1-1
Author(s)
          Jim  Dawson
Date Published

May 2015
Length
              1 page
Publication Series
          NIJ Journal
Annotation
              This article describes progress to date of a NIJ-sponsored project that is determining whether a new system that combines magnetic fields, polarized light, and a special sensor is better than the traditional method for recovering and reading obliterated serial numbers.
Abstract
              The new method uses magneto-optical (MO) sensor technology to nondestructively detect and visualize serial numbers that have been scratched, ground, chiseled, or otherwise removed from firearms.  Thus far, the project researchers report that  although this new system isn't perfect, compared to the current  nondestructive method used in most crime laboratories, i.e., magnetic particle inspection (MPI), MO  sensor technology is "slightly more sensitive, sees a little deeper, is not as messy, and requires a little less work."  The project, which began in 2011, has completed the first phase of research, which involved testing the sensors on flat, smooth surfaces.  The project is currently testing some of the 2,000 firearms in the Johnson County Sheriff's Office (Missouri) crime laboratory's reference library.  This article notes that both the MO Sensor technology and the standard MPI method use strong magnetic fields to reveal obliterated serial numbers, which requires that the firearms be made of a magnetic material.  For weapons made of nonmagnetic materials, crime laboratories must still use chemical etching, which uses strong acids and typically reveals a serial number for only a few moments before possibly destroying it.  Regarding cost considerations, phase two testing has discovered that laying a sensor directly on a firearm avoids the expensive viewing system, and using fragments of broken sensors can also reduce costs, providing they are large enough to cover an obliterated area.  The collection of the final data from phase two will soon be completed and a final report published within several months.
      
  
          Additional Details
Grant Number(s)
        2011-DN-BX-K564


  
  
        
  Agencies
        NIJ


  
  
        
  Publication Type
        Test/Measurement
                                Research (Applied/Empirical)
                                Report (Technical)
                                Report (Study/Research)
                                Report (Grant Sponsored)


  
  
        
  Award
        Forensic Science Training Development and Delivery Program
    
  
  
Date Published: May 1, 2015
    
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      PatentsRelated Topics
        
                Criminology
        Erased identification restoration
        Firearm tracing
        Forensic sciences
        Gun violence



  
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