The susceptibility of incoherent detector systems to cryocooler microphonics.

Computer Science – Performance

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Infrared Detectors: Space Instrumentation

Scientific paper

Mechanical cryocoolers will be used to provide 4K cooling for the HFI bolometer instrument in the Planck Surveyor mission for measurement of the anisotropies in the cosmic microwave background. They may also find application in future Earth-observing satellites. The authors describe an experimental programme to investigate the effects of microphonic vibrations on infrared detectors. The initial tests have demonstrated the feasibility of operating far-infrared photoconductive detectors in conjunction with a 4K cryocooler for Earth observing applications. The microphonic susceptibility of a bolometer at 100mK has also been investigated, using a modified variation of the Planck Surveyor zero gravity flight dilution system. The results of these tests give confidence in the proposed use of sensitive bolometers with mechanical cryocoolers for space missions. The authors also describe development of the bolometers, the readout systems and temperature regulators for improved systems level performance of such instruments.

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