The next generation of infrared remote sensing satellite instrumentation, including climate benchmark missions will
require better absolute measurement accuracy than now available, and will most certainly rely on the emerging capability
to fly SI traceable standards that provide irrefutable absolute measurement accuracy. As an example, instrumentation
designed to measure spectrally resolved infrared radiances with an absolute brightness temperature error of better than
0.1 K will require high-emissivity (<0.999) calibration blackbodies with emissivity uncertainty of better than 0.06%, and
absolute temperature uncertainties of better than 0.045K (k=3). Key elements of an On-Orbit Absolute Radiance
Standard (OARS) meeting these stringent requirements have been demonstrated in the laboratory at the University of
Wisconsin (UW) and refined under the NASA Instrument Incubator Program (IIP). This work recently culminated with
an integrated subsystem that was used in the laboratory to demonstrate end-to-end radiometric accuracy verification for
the UW Absolute Radiance Interferometer. Along with an overview of the design, we present details of a key underlying
technology of the OARS that provides on-orbit absolute temperature calibration using the transient melt signatures of
small quantities (<1g) of reference materials (gallium, water, and mercury) imbedded in the blackbody cavity. In
addition we present performance data from the laboratory testing of the OARS.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fred A. Best ; Douglas P. Adler ; Claire Pettersen ; Henry E. Revercomb ; P. Jonathan Gero, et al.
"On-orbit absolute radiance standard for the next generation of IR remote sensing instruments", Proc. SPIE 8527, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques and Applications IV, 85270N (November 9, 2012); doi:10.1117/12.977559; http://dx.doi.org/10.1117/12.977559