The wavelength dependence of the modulation transfer function of the atmosphere.
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Author
Mackin, Jere Gene
Date
1972-06Advisor
Kalmbach, Sydney H.
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Show full item recordAbstract
An apparatus was designed and constructed to measure the modulation
transfer function of the atmospheric medium as a function of wavelength
of light. The modulation transfer function (MTF) in this case was
considered to be the ratio of the modulation of an optical target at
a fixed range to the modulation at a range short enough so that atmospheric
attenuation was negligible.
Modulation measurements were made using a telescope which focused
the image of the target on a slit. The image was mechanically scanned
across the slit by a rotating mirror, and the intensity at the slit was
measured by a photodetector.
The preliminary results indicated a linear decrease in modulation
of 0.1 per 1000Å.
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