comparison microscope การใช้

• Traditional firearms identification involves the use of a Comparison Microscope.
• For this purpose, the traditional tool of the firearms examiner has been what is often called the ballistics comparison microscope.
• Comparison microscope is used to analyze the matching of the microscopic impressions found on the surface of bullets and casings.
• Known exemplars taken from a seized weapon can be directly compared to samples recovered from the scene using a comparison microscope.
• The invention of the comparison microscope by Calvin Goddard and Phillip O . Gravelle in 1925 modernized the forensic examination of firearms.
• Deedrick said he had used a polarizing microscope, a fluourescent microscope, a scanning electronic microscope and a comparison microscope to inspect the fibers.
• The prevalence of hand-gun related crime in the United States compared to most other developed countries provided the impetus for the development of the comparison microscope.
• Once a known exemplar is produced, the evidence sample can be compared to the known by examining both at the same time with a comparison microscope.
• These are designed to simulate the operation of the comparison microscope but is capable of rendering a 2D view of the 3D surfaces in a manner similar to that of the conventional comparison microscope.
• These are designed to simulate the operation of the comparison microscope but is capable of rendering a 2D view of the 3D surfaces in a manner similar to that of the conventional comparison microscope.
• In the past, police forensics experts have linked the same gun to different crimes by using a comparison microscope to examine the markings on shells or bullets found at the scene of one crime with those found at another, a time-consuming and haphazard process.
• At the same time, Major Calvin Goddard, a ballistics expert who had helped pioneer the use of the comparison microscope in forensic ballistic research, offered to conduct an independent examination of the forensic gun and bullet evidence using techniques he had developed for use with the comparison microscope.
• At the same time, Major Calvin Goddard, a ballistics expert who had helped pioneer the use of the comparison microscope in forensic ballistic research, offered to conduct an independent examination of the forensic gun and bullet evidence using techniques he had developed for use with the comparison microscope.
• Since, ballistic identification has benefited from a long series of structural, scientific and technological advances, law enforcement agencies have established forensic laboratories and researchers have learned much more about how to match bullets and cartridge cases to the guns used to fire them, and comparison microscopes have become more sophisticated.