Method of determining the distance of a feature on an object from a microscope, and a device for carrying out the method
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United States of America Patent
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Nov 24, 1998
Grant Date -
N/A
app pub date -
Dec 12, 1996
filing date -
Apr 11, 1994
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Abstract
The invention is directed to a surgical microscope in which, to determine the distance between the microscope (8, 13) and the object (22), the travel time of a beam of light (57c) emanating from the microscope and reflected by the object is determined. The travel time is determined by phase measurement or by interference matching. In the case of direct phase measurement, modulated light is used. In the case of interference matching, partly coherent light is used. In order to ensure high accuracy over wide measurement range, the two measurement methods are preferably used in combination.
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