Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1997-03-20
1998-11-24
Font, Frank G.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
G01M 1100
Patent
active
058415254
ABSTRACT:
In a method and apparatus for performing an MTF test on endoscopes, a beam of light is filtered through a sinusoidally-varying medium defining a transmittance which is approximately uniform along a first direction within the medium, and which varies sinusoidally along a second direction within the medium thereby generating a beam defining an intensity which varies sinusoidally in a predetermined direction. The filtered beam is transmitted through an endoscope from a first end through a second end of the endoscope, and a video system generates signals indicative of the optical intensity of the transmitted beam at each of a plurality of predetermined locations within the beam. Noise is filtered from the intensity signals, and the filtered intensity signals are in turn used in determining the MTF at each of a plurality of predetermined locations within the beam, thereby providing an indication of the optical performance characteristics of the endoscope.
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Beatrice Finton
Rosow Eric
Font Frank G.
Hartford Hospital
Stafira Michael P.
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