The German infrared laboratory (girl) — a progress report

Abstract The liquid helium cooled 50 cm-IR-telescope is equipped with a 4-band-camera, a photopolarimeter, a grating spectrometer and a Michelson interferometer. These focal plane instruments allow measurements with high spectral resolution, high sensitivity and diffraction limited spatial resolution in the wavelength region 2.5 … 200 μm. - The “thermal model” phase of the project was successfully completed in 1983. This phase included the development and construction of a full size cryostat, which was thoroughly tested by an experiment simulator. Prototypes of all focal plane instruments have been developed and severral have already been tested under the expected flight conditions. - At present the “flight model” phase to be entered in 1984 is being prepared. The first Spacelab flight of the reusable IR observatory is planned for 1988. It will include measurements in astrophysics, atmospheric science and helium II physics.