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Design and calibration of field deployable ground-viewing radiometers
Nikolaus Anderson1, Jeffrey Czapla-Myers, Nathan Leisso
1Remote Sensing Group, College of Optical Sciences, University of Arizona, 1630 East University Boulevard, Tucson, AZ 85721, USA. nanderson@optics.arizona.edu
Abstract:
Three improved ground-viewing radiometers were built to support the Radiometric Calibration Test Site (RadCaTS) developed by the Remote Sensing Group (RSG) at the University of Arizona. Improved over previous light-emitting diode based versions, these filter-based radiometers employ seven silicon detectors and one InGaAs detector covering a wavelength range of 400-1550 nm. They are temperature controlled and designed for greater stability and lower noise. The radiometer systems show signal-to-noise ratios of greater than 1000 for all eight channels at typical field calibration signal levels. Predeployment laboratory radiance calibrations using a 1 m spherical integrating source compare well with in situ field calibrations using the solar radiation based calibration method; all bands are within ±2.7% for the case tested.
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