Curtis Emerson Youngdahl
Engineers at Crestridge Dr, Vernon, CT

License number
Colorado 10993
Issued Date
Feb 19, 1972
Renew Date
Jan 1, 2000
Expiration Date
Jan 1, 2000
Type
Professional Engineer
Address
Address
50 Crestridge Dr, Vernon, CT 06066
LicenseFiles verified this license of Dec 9, 2016 at the Colorado - Department of Regulatory Agencies.

Professional information

Curtis Youngdahl Photo 1

Method And Apparatus For Evaluating The Performance Characteristics Of Endoscopes

US Patent:
5953112, Sep 14, 1999
Filed:
Mar 20, 1997
Appl. No.:
8/821112
Inventors:
Eric Rosow - Avon CT
Finton Beatrice - Vernon CT
Joseph Adam - West Hartford CT
Curtis Youngdahl - Vernon CT
Assignee:
Hartford Hospital - Harford CT
International Classification:
G01N 2100
US Classification:
356 731
Abstract:
In a method and apparatus for evaluating the performance characteristics of fiber-optic endoscopes, a beam of light defining a predetermined intensity pattern is transmitted through the endoscope from a tip end through an eyepiece end of the endoscope. The intensity pattern of the beam defines either a uniform intensity, or an intensity which varies sinusoidally in a predetermined direction across the beam. The following tests are performed in order to evaluate both the optical fibers and the lens system of the endoscope, and the intensity pattern is selected in accordance with the requirements of the respective test: (i) a light loss test, (ii) a reflective symmetry test, (iii) a lighted fibers test, (iv) a geometric distortion test, and (v) a MTF test. A video system generates signals indicative of the optical intensity of the beam after transmission through the endoscope at each of a plurality of predetermined locations within the beam. The video signals are in turn evaluated in accordance with the selected tests in order to provide graphical and numerical indicia of the optical performance characteristics of the endoscope.