Abstract
Abstract The authors have used a commercially available laser ceilometer to measure vertical profiles of the optical extinction in rain. This application requires special signal processing to correct the raw data for the effects of receiver noise, high-pass filtering, and the incomplete overlap of the transmitted beam with the receiver field of view at close range. The calibration constant of the ceilometer, denoted by C, is determined from the profile of the corrected returned power in conditions of moderate attenuation in which the power is completely extinguished over a distance on the order of 1 km. In this determination, the value of the backscatter-to-extinction ratio k of the scattering medium must be specified and an allowance made for the effects of multiple scattering. These requirements impose an uncertainty on C that can amount to ±50%. An alternative to determining the calibration constant is explained, which does not require specifying k, although it assumes that k is constant with height. U...
Published Version
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