Far-Infrared Spectrometry and High-Resolution Photometry on IRAS

The Dutch Additional Experiment (DAX) was a focal-plane instrument package flown successfully on the IRAS satellite. The package contained a low-resolution spectrometer, operating between 8 and 23 μm, and a two-channel photometer with bands at 60 and at 100 μm. The design and the in-flight performance of both instru-ments are discussed.