A ultra low photon background 1 to 5 micron detector mosaic test facility Reinhold J. Dorn, S. Eschbaumer, G. Finger, J. P. Kirchbauer, L. Mehrgan, M. Meyer, A. Silber and J. Stegmeier - PowerPoint PPT Presentation

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PPT – A ultra low photon background 1 to 5 micron detector mosaic test facility Reinhold J. Dorn, S. Eschbaumer, G. Finger, J. P. Kirchbauer, L. Mehrgan, M. Meyer, A. Silber and J. Stegmeier PowerPoint presentation | free to download - id: 73509c-NjhhY



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A ultra low photon background 1 to 5 micron detector mosaic test facility Reinhold J. Dorn, S. Eschbaumer, G. Finger, J. P. Kirchbauer, L. Mehrgan, M. Meyer, A. Silber and J. Stegmeier

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Title: Reinhold Dorn Presentation to the Director General Monday, December 06, 1999 – PowerPoint PPT presentation

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Title: A ultra low photon background 1 to 5 micron detector mosaic test facility Reinhold J. Dorn, S. Eschbaumer, G. Finger, J. P. Kirchbauer, L. Mehrgan, M. Meyer, A. Silber and J. Stegmeier


1
A ultra low photon background 1 to 5 micron
detector mosaic test facilityReinhold J.
Dorn, S. Eschbaumer, G. Finger, J. P. Kirchbauer,
L. Mehrgan, M. Meyer, A. Silber and J. Stegmeier
  • European Southern Observatory - Instrumentation
    Division

2
Design of the test facility
Cryogenic blackbody with the epoxy spiders and
heating resistors
Detector mosaic facing down looking inside the
structure. The cryogenic preamplifiers and the
cold braid connection are shown.
Filterwheel with J, H, K, L, M filters
3
IR detector mosaic testfacility
  • Functionality and cryogenic performance of the
    detector system
  • Optimization of feedtroughs and radiation
    shielding
  • Darkcurrent and readnoise for very low flux
    applications
  • Cosmetic quality, uniformity and
    electroluminescence
  • Quantum efficiency in J, H, K, L and M
  • Analog bandwidth of the video output
  • Measurement of instrumental photon background
  • Photon transfer curve and calibration

4
Applications The CRIRES and Hawk-I focal plane
mosaics
The first application for the testfacility was
the CRIRES 512 x 4096 pixels Aladdin InSb focal
plane array mosaic the newly developed 3-side
buttable package as seen on the right side.
The second application for the new testfacility
is the Hawk-I detector mosaic with four 2kx2k
Rockwell HgCdTe MBE buttable arrays with 2.5µm
cut-off. GL Scientific is providing the packaging
and mount.
5
Examples of Results
Some results obtained with the CRIRES detectors
are shown below as an example.
Comparison of efficiency corrected for cos4
dependence of illumination and different
conversion gains
Photon transfer curve for an Aladdin array
Map of efficiency of CRIRES mosaic with pinhole
grid mask
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