Characteristics of the ISO short wavelength spectrometer detectors

Details Characteristics of the ISO short wavelength spectrometer detectors Characteristics of the ISO short wavelength spectrometer detectors

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.356..339w&link_type=abstract

In ESA, Proceedings of an ESA Symposium on Photon Detectors for Space Instrumentation p 339-344 (SEE N94-15025 03-19)

Computer Science

Performance

1

Infrared Detectors, Infrared Space Observatory (Iso), Infrared Spectroscopy, Spacecraft Instruments, Performance Tests, Technology Assessment, Transient Response

Scientific paper

The ISO (Infrared Space Observatory) Short Wavelength Spectrometer (SWS) employs four different types of detectors, which will all be operated at a low flux. Preliminary results of an extensive characterization of these detectors, both in the flight instrument and in a laboratory setup, are presented. In general, the performance of the instrument is as expected and quite low instrument noise equivalent powers are achieved (approximately 10 to the minus 17th power W/square root of Hz). However, the behavior of at least one of the detector types, Si:Sb, is troublesome. Characteristic features of this behavior are presented: long time transient response, memory effects, hook effects and excess noise. The Si:Sb transient responses can be described by two time constants. In contrast with the amplitude of the transient responses, these time constants depend only weakly on illumination power, temperature and bias voltage. This anomalous detector behavior implies specific designs of the observation strategies, which have to avoid 'flat-fielding' difficulties.

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