Low-background large-aperture infrared measurement facility: performance.
A novel ir measurement facility that generates a 43-cm diam collimated beam of radiant flux in a simulated exoatmospheric environment has been built and evaluated. The broadband and spectral irradiance of the beam was measured with a calibrated integral three-grating spectroradiometer. The irradiance values cover a range of 10(8), with near Planckian distribution at higher flux densities. The beam source can also generate monochromatic radiation tunable from 2 microm to 32 microm. Diffraction losses at the source aperture have been estimated.
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