20 October 1993 100-mK bolometric receiver for low-background astronomy
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Abstract
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 10-17 W/(root)Hz have been achieved.
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S. T. Tanaka, S. T. Tanaka, Andre Clapp, Andre Clapp, Mark J. Devlin, Mark J. Devlin, Marc L. Fischer, Marc L. Fischer, Chris Hagmann, Chris Hagmann, Andrew E. Lange, Andrew E. Lange, Paul L. Richards, Paul L. Richards, } "100-mK bolometric receiver for low-background astronomy", Proc. SPIE 1946, Infrared Detectors and Instrumentation, (20 October 1993); doi: 10.1117/12.158665; https://doi.org/10.1117/12.158665
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