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Proceedings Paper

A two-dimensional semiconducting bolometer array for HAWC
Author(s): George M. Voellmer; Christine A. Allen; Sachidananda R. Babu; Arlin E. Bartels; Charles Darren Dowell; Jessie L. Dotson; Doyle A. Harper; S. Harvey Moseley Jr.; Timothy Rennick; Peter J. Shirron; W. Wayne Smith; Edward J. Wollack
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Paper Abstract

The Stratospheric Observatory For Infrared Astronomy's (SOFIA's) High resolution Airborne Wideband Camera (HAWC) will use an ion-implanted silicon bolometer array developed at NASA's Goddard Space Flight Center (GSFC). The GSFC Pop-Up Detectors (PUDs) use a unique "folding" technique to enable a 12 x 32 element close-packed array of bolometers with a filling factor greater than 95%. The HAWC detector uses a resistive metal film on silicon to provide frequency independent, ~50% absorption over the 40 - 300 micron band. The silicon bolometers are manufactured in 32-element rows within silicon frames using Micro Electro Mechanical Systems (MEMS) silicon etching techniques. The frames are then cut, "folded", and glued onto a metallized, ceramic, thermal bus "bar". Optical alignment using micrometer jigs ensures their uniformity and correct placement. The rows are then stacked side-by-side to create the final 12 x 32 element array. A kinematic Kevlar suspension system isolates the 200 mK bolometer cold stage from the rest of the 4K detector housing. GSFC - developed silicon bridge chips make electrical connection to the bolometers, while maintaining thermal isolation. The Junction Field Effect Transistor (JFET) preamplifiers for all the signal channels operate at 120 K, yet they are electrically connected and located in close proximity to the bolometers. The JFET module design provides sufficient thermal isolation and heat sinking for these, so that their heat is not detected by the bolometers. Preliminary engineering results from the flight detector dark test run are expected to be available in July 2004. This paper describes the array assembly and mechanical and thermal design of the HAWC detector and the JFET module.

Paper Details

Date Published: 8 October 2004
PDF: 10 pages
Proc. SPIE 5498, Millimeter and Submillimeter Detectors for Astronomy II, (8 October 2004); doi: 10.1117/12.552016
Show Author Affiliations
George M. Voellmer, NASA Goddard Space Flight Ctr. (United States)
Christine A. Allen, NASA Goddard Space Flight Ctr. (United States)
Sachidananda R. Babu, NASA Goddard Space Flight Ctr. (United States)
Arlin E. Bartels, NASA Goddard Space Flight Ctr. (United States)
Charles Darren Dowell, Jet Propulsion Lab. (United States)
California Institute of Technology (United States)
Jessie L. Dotson, NASA Ames Research Ctr. (United States)
Doyle A. Harper, Univ. of Chicago (United States)
S. Harvey Moseley Jr., NASA Goddard Space Flight Ctr. (United States)
Timothy Rennick, Univ. of Chicago (United States)
Peter J. Shirron, NASA Goddard Space Flight Ctr. (United States)
W. Wayne Smith, Orbital Sciences Corp. (United States)
Edward J. Wollack, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 5498:
Millimeter and Submillimeter Detectors for Astronomy II
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington, Editor(s)

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