100-mK bolometric receiver for low-background astronomy

Details 100-mK bolometric receiver for low-background astronomy 100-mK bolometric receiver for low-background astronomy

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1946..110t&link_type=abstract

Proc. SPIE Vol. 1946, p. 110-115, Infrared Detectors and Instrumentation, Albert M. Fowler; Ed.

Astronomy and Astrophysics

Astronomy

Scientific paper

The design and construction of 100 mK composite bolometers for low background submillimeter and millimeter-wave astronomy are discussed. The bolometers are cooled to 100 mK using an adiabatic demagnetization refrigerator. The bolometers consist of a silicon substrate suspended by nylon fibers, a bismuth film absorber, a neutron transmutation doped germanium thermometer with graphite fiber electrical leads, and a brass wire thermal strap. Heated JFET amplifiers located on the 1.5 K cold plate are used to read out the bolometer signals. Electrically measured noise equivalent powers as low as 2 X 10(superscript -17) W/(root)Hz have been achieved.

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