Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1992-05-15
1994-07-05
Warden, Robert J.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356360, 356345, 356354, G01B 1100, G01B 902
Patent
active
053272196
ABSTRACT:
A device for eliminating unwanted reflections from refractive optical elements in an optical system is provided. The device operates to prevent desired multiple fringe patterns from being obscured by reflections from refractive elements positioned in proximity to a focal plane of the system. The device exploits the 180-degree offset, or rotational shear, of the undesired reflected light by providing an optical stop for blocking one-half of the cross-section of the test beam. By blocking one-half of the test beam, the undesired offset beam is blocked, while the returning transmitted beam passes into the optical system unaffected. An image is thereby produced from only the desired transmitted beam. In one configuration, the blocking device includes a semicircular aperture which is caused to rotate about the axis of the test beam. By rotating, all portions of the test beam are cyclically projected into the optical system to thereby produce a complete test image. The rotating optical stop is preferably caused to rotate rapidly to eliminate flicker in the resulting image.
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Steimle Lawrence J.
Thiessen David L.
Jones Thomas H.
Kim Christopher Y.
Kusmiss John H.
Miller Guy M.
The United States of America as represented by the Administrator
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