Calibration errors in cloud-base temperature remote sensing with ground-based infrared radiometers

Joseph A. Shaw

doi:10.1117/12.137902

1 August 1992 Calibration errors in cloud-base temperature remote sensing with ground-based infrared radiometers

Joseph A. Shaw

Proceedings Volume 1688, Atmospheric Propagation and Remote Sensing; (1992) https://doi.org/10.1117/12.137902
Event: Aerospace Sensing, 1992, Orlando, FL, United States

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.

Citation Download Citation

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); https://doi.org/10.1117/12.137902

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