1 August 1992 Calibration errors in cloud-base temperature remote sensing with ground-based infrared radiometers
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Abstract
Cloud-base temperature is a useful parameter in atmospheric and climate research, meteorology, and hydrology. This parameter can be sensed remotely by inferring the cloud- base temperature from the brightness temperature observed with a ground-based infrared radiometer. Infrared radiometric measurements in the 10 - 12 micrometers `atmospheric window' spectral region routinely can have accuracies of +/- 1.0 degree(s)C if the radiometer is calibrated carefully. However, subtle calibration errors easily can increase this uncertainty many times. These errors arise largely because the calibration temperatures are less than the ambient temperature. In this paper I describe errors due to inadequate blackbody simulation, fluctuations in radiometer temperature, and imprecise voltage measurements during calibration. I also discuss simple ways of avoiding or minimizing each of these errors.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joseph A. Shaw, "Calibration errors in cloud-base temperature remote sensing with ground-based infrared radiometers", Proc. SPIE 1688, Atmospheric Propagation and Remote Sensing, (1 August 1992); doi: 10.1117/12.137902; https://doi.org/10.1117/12.137902
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