Technology investments made over the past decade by the NASA Earth Science Technology Office
(ESTO) have enabled the current mission concept of the Climate Absolute Radiance and Refractivity
Observatory (CLARREO) mission. Early investments include the Far-Infrared Spectroscopy of the
Troposphere (FIRST) instrument, which today is being used as a testbed to demonstrate new detectors
under development. Current investments, aimed at the CLARREO goals of high absolute accuracy and onorbit
international measurement standards traceability, include a prototype hyperspectral imager, extended
blocked impurity band detectors for far-infrared detection, and a high-accuracy blackbody.