COBRAS/SAMBA High Frequency Instrument
COBRAS/SAMBA carries a High Frequency Instrument (LFI) which is envisaged
to use cooled bolometers operating at about 0.1 to 0.3 K.
A block diagram of the HFI is shown in the next figure and summarized in the
Block Diagram of Cooled LFI
This figure shows a sketch of the configuration of the HFI for an actively
The main spacecraft is at abou 300K, the payload instrument area (focal plane)
is designed to be cooled passively via radiation to about 65 K
and active coolers can be used to bring the HFI fron-end bolometers
to about 0.1 K and JFET preamplifiers to about 20 K. This action
results in very good sensitivity.
HFI Schematic Chart