Computer Science – Performance
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104.1244h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 682, p. 1244-1251.
Computer Science
Performance
36
Optical Coupling, Optical Fibers, Pattern Recognition, Spectrographs, Telescopes, Far Fields, Near Fields, Performance Prediction, Radial Velocity
Scientific paper
The scrambling properties of optical fibers which are particularly important in precision radial-velocity observations are examined. A single multimode step-index fiber, such as is commonly used in astronomical applications, is found to be deficient as a scrambler: the output beam has some memory of the input object position and incident angle. A solution to this problem - a prototype double scrambler using two fibers coupled by an afocal lens system - is characterized. With the double scrambler, intensity variations across the near- and far-field patterns due to both angular and positional changes in the input beam are reduced by factors ranging from 2 to 10. In all cases, relative variations across the images are reduced to or below the 1-percent level. With the superior image scrambling provided by the double scrambler, pixel shifts of 0.001 can be reliably detected.
Hunter Todd Russell
Ramsey Lawrence W.
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