title: Low-background large-aperture infrared measurement facility: performance.
abstract: 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.
authors.forename: R H
authors.initials: RH
authors.lastname: Meier
authors.forename: A B
authors.initials: AB
authors.lastname: Dauger