System for detecting, correcting and measuring depth movement of a target
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United States of America Patent
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Feb 15, 1994
Issued Date -
N/A
app pub date -
Sep 15, 1992
filing date -
Feb 19, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for detecting, measuring and correcting for movements of a target in a medical analytic or surgical system utilizes generally the principles of confocal microscopy. A pinhole and photodetector combination is positioned behind optics of a system for delivering an ophthalmic surgery laser beam, for example. As in a confocal microscope, the optics are arranged such that a beam waist is formed precisely at the pinhole when the target is in its nominal position. When the target moves from its nominal position in the depth direction, the signal from the pinhole/photodetector combination decreases. The change in the signal can be used to drive the objective lens of the optics so as to move with the moving target. Alternatively, the signal can be used to drive the pinhole/photodetector assembly so as to again attain peak signal, in this way allowing the target's shift to be measured.
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