Abstract
The balloon-borne cryogenic far-infrared spectrometer (FIS) described in this paper is a liquid-helium cooled direct-detection spectrometer which covers the wavelength range from 140 μm to 220 μm. The spectral resolution R is about 2000. FIS is based on two scanning Fabry–Perot interferometers (SFPs) whose reflector gaps can be varied continuously over more than 200 μm by the magnetic force of superconducting coils. FIS has been developed to measure far-infrared emission lines from star-forming regions. The most prominent among these are the 157 μm [CII] line and the 205 μm [NII] line. In order to perform the calibration of FIS during the flight preparation at the balloon-launch facility of CNES in Aire sur l'Adour (France), we have devised a new method of calibration of FIS which is performed exclusively with the help of an evacuable absorption cell. In-flight tests in the stratosphere have confirmed that all components of the instrument work. This test permitted us to estimate the system noise equivalent power (NEP sys). It is in the expected range of about 10 −14 W/Hz 1/2 at the wavelength of 157 μm and of about 2×10 −14 W/Hz 1/2 at 205 μm wavelength.
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