Wide-Field-of-View Longwave Camera for the Characterization of the Earth’s Outgoing Longwave Radiation

The measurement of the Earth's Outgoing Longwave Radiation plays a key role in climate change monitoring. This measurement requires a compact wide-field-of-view camera, covering the 8-14 m wavelength range, which is not commercially available. Therefore, we present a novel thermal wide-field-of-view camera optimized for space applications, featuring a field of view of 140° to image the Earth from limb to limb, while enabling a high spatial resolution of 4.455 km at nadir. Our cost-effective design comprises three germanium lenses, of which only one has a single aspherical surface. It delivers a very good image quality, as shown by the nearly-diffraction-limited performance. Radiative transfer simulations indicate excellent performance of our camera design, enabling an estimate of the broadband Outgoing Longwave Radiation with a random relative error of 4.8%.

Jaar van publicatie:2021

Trefwoorden:Earth Energy Imbalance; Earth Radiation Budget; Outgoing Longwave Radiation; aspherical optical design; radiative transfer simulations; refractive imaging system; space instrumentation; wide field of view

BOF-keylabel:ja

IOF-keylabel:ja

BOF-publication weight:1

Auteurs:Regional

Authors from:Government, Higher Education

Toegankelijkheid:Open