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Evaluation of composite bolometers at 0.4 kelvin

El-Ataway, S., Ade, Peter A. R., Radostitz, J. V. and Nolt, I. G. 1980. Evaluation of composite bolometers at 0.4 kelvin. International Journal of Infrared and Millimetre Waves 1 (3) , pp. 459-468. 10.1007/BF01007326

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Composite bolometer structures have provided the most sensitive IR detectors for operation at helium-4 temperatures of 1.5K. Below 1.5K the electrical and thermal properties change significantly and the performance characteristics cannot be accurately extrapolated for composite bolometers at helium-3 temperatures of 0.4K. The paper deals with experimentally assessed performance of composite bolometers at 0.4K. It is found that sensitivity estimates derived from electrical or load curve properties can overestimate the responsivity to radiation by several orders of magnitude depending upon a particular material behavior. For many near-millimeter applications background power levels are several nanowatts and the associated photon noise plus Johnson and phonon noise components impose a fundamental detection limit of about 5 x 10 to the -15thW/Hz to the -1/2. We have successfully fabricated composite bolometers which at 0.4 K and millimeter wavelengths achieve a noise equivalent power of 7 x 10 to the -15thW/Hz to the -1/2 coupled with a large absorbing area (0.3 sq cm) and a fast response time (2 msec.).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: bolometers, cryogenics, infrared detectors, low temperature tests, performance tests, background noise, electrical properties, millimeter waves, thermodynamic properties, time response
Publisher: Springer
ISSN: 0195-9271
Last Modified: 04 Jun 2017 04:32

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