comparison microscope


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comparison microscope

[kəm′par·ə·sən ′mī·krə‚skōp]
(optics)
An arrangement of two microscopes connected by a special receiving ocular so that the field of one microscope is seen at one side of a dividing line and the field of the other microscope at the opposite side.
A projection type of microscope in which the image is compared with a template or known pattern.
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References in periodicals archive ?
'It uniquely combines comparison microscope technology with ballistic identification technology for confident results and has the capability to integrate crime scene evidence with forensic lab scrutiny,' Camarao said.
Aside from the P50-million DNA equipment, the 50-million RCLO building has a P269-million Automated Fingerprint Identification System and a P12-million forensic bullet comparison microscope.
Along with key cases, he details such techniques as Alphonse Bertillon's program of physical measurements used to recognize habitual criminals; the study of fingerprints; Phillip Gravelle's comparison microscope for examining bullets; the development of bloodstain identification; and recent advances in DNA typing techniques, blood-spatter analysis, and face-pattern recognition.
Jefferson received a grant that paid for the comparison microscope the class uses.
Surfaces marked by the same tool (whether the tool is a screwdriver or barrel bore) tend to have strong similarities/ correspondence in their fine features, whereas surfaces marked by different tools show far fewer similarities and less correspondence when viewed under a comparison microscope using typical magnifications of 10X-50X.
Then, by properly focusing the instrument and moving the bullets or shells into their correct positions, the comparison microscope will transmit the fusion of both fatal and test bullets or shells.
Although the technology was primitive in 1921, by 1927 the comparison microscope was in use, and in tests made in that year and again in 1935, 1961 and 1983, it was shown that one bullet taken from the body of the dying payroll guard had been fired from Sacco's Colt pistol.
The comparison process involves the side-by-side analysis of a questioned hair and known hair samples using a comparison microscope. This allows for a direct comparison of the microscopic characteristics of the questioned hair within the same relative area of the known sample, at the same time and in the same field of view.
The use of a high-quality transmitted light comparison microscope is mandatory when comparing the microscopical characteristics of hairs.

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