Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1991-02-19
1992-11-10
Hannaher, Constantine
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
351221, G01S 1708
Patent
active
051626411
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.
REFERENCES:
patent: 4686360 (1987-08-01), Gorgon
patent: 4881808 (1989-11-01), Bille et al.
patent: 4936676 (1990-06-01), Stauffer
Freiburger Thomas M.
Hannaher Constantine
Phoenix Laser Systems, Inc.
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