Modular 25x16 pixel stressed array for PACS aboard FIRST

Details Modular 25x16 pixel stressed array for PACS aboard FIRST Modular 25x16 pixel stressed array for PACS aboard FIRST

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3759..214k&link_type=abstract

Proc. SPIE Vol. 3759, p. 214-220, Infrared Spaceborne Remote Sensing VII, Marija Strojnik; Bjorn F. Andresen; Eds.

Physics

Optics

Scientific paper

For the Photoconductive Array Camera and Spectrometer (PACS) 2 sensor arrays consisting of each 16 X 25 pixels are foreseen. The sensors arranged in linear arrays with 16 detectors are tuned to the wavelength ranges 60 micrometer to 130 micrometer and 130 micrometer to 210 micrometer by applying different levels of stress to the Ge:Ga crystals utilizing a special leaf spring which is part of each of the 25 modules. The electronics of the sensors are mounted on the same module but thermally isolated from the sensor level which is linked to a 1.7 K stage. The sensors are read out by a new generation of the integrating and multiplexing cryogenic readout electronics (CRE). With the optical design a 100% filling factor is achieved and with a fore optics made of light cones in front of the detector cavities a high detection efficiency close to 1 is expected. In order to achieve extreme high stress uniformity among all detectors and therefore equal cutoff wavelengths, a high degree of the quality of the Ge:Ga detectors and of the assembling components used for this dedicated stress mechanism is required. The first two engineering modules have been successfully manufactured and tested afterwards. The relative responsivity of a set of pixels has been determined and a good performance demonstrated for the sensors which are very close to fulfill the requirements for PACS aboard the infrared telescope FIRST.

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