Computer Science – Performance
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ssrv...74..229b&link_type=abstract
Space Science Reviews, Volume 74, Issue 1-2, pp. 229-235
Computer Science
Performance
29
Scientific paper
We are developing a novel bolometer which uses a fine mesh to absorb radiation. The filling factor of the mesh is small, providing a small heat capacity and a low geometric cross-section to cosmic rays. The mesh is patterned from a free-standing silicon nitride membrane and is thermally isolated by long radial legs of silicon nitride. A thin metallic film evaporated on the mesh absorbs radiation by matching the surface impedance to that of free space. A neutron transmutation doped germanium thermistor attached to the center of the mesh detects the temperature increase from absorbed radiation. The low thermal conductivity and heat capacity of silicon nitride provide improved performance in low background applications. We discuss the theoretical limits of the performance of these devices. We have tested a device at 300 mK with an electricalNEP=4×10-17 W Hz-1/2 and a time constant τ=40 ms.
Bock James Joseph
Chen Daguang
Lange Andrew E.
Mauskopf Phil D.
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