Abstract
As a tool in the evaluation of various electrooptical systems, it is desirable to be able to measure accurately the atmospheric transmission over long optical paths. Typically, this is accomplished by providing a calibrated radiation source at one end of the path and a calibrated radiometer at the other. The radiation measured by the receiving radiometer is compared with that which would have been received at the same distance in a vacuum, and the ratio is defined as the atmospheric transmission τ.
© 1976 Optical Society of America
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