Bolometers operated at 0.1 K and 0.2 K cooled by adiabatic demagnetization |
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Authors: | Larry Lesyna Thomas P L Roellig and Peter Kittel |
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Institution: | (1) Center for Space Science and Astrophysics, Stanford University, 94305 Stanford, CA;(2) NASA-Ames Research Center, 94035 Moffett Field, CA |
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Abstract: | We have constructed bolometers operating at temperatures of 0.1 K and 0.2 K cooled by adiabatic demagnetization. The electrical noise equivalent power (NEP) of the bolometers was found to be 1.8×10–16 W/Hz1/2 and 6.6×10–16 W/Hz1/2 respectively. These values are within a factor of two of the expected performance based upon bolometer theory. The thermistor material used was gallium doped single crystal germanium, for which we find a resistivity temperature dependence of the form = o exp (AT–1/2). |
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Keywords: | bolometers refrigeration infrared detectors millimeter astronomy |
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