Low-noise readout of superconducting bolometers based on electrothermal feedback
- 13 February 2006
- journal article
- Published by IOP Publishing in Superconductor Science and Technology
- Vol. 19 (4) , 319-322
- https://doi.org/10.1088/0953-2048/19/4/013
Abstract
We have developed a simple room-temperature readout for superconducting bolometers and calorimeters. Due to electro-thermal feedback, the bolometer can be noise-matched with the readout amplifier. The constructed amplifier consists of low-noise field-effect transistors, and voltage bias is actively provided by electrical feedback. According to our measurements on superconducting vacuum-bridge bolometers, the total noise is limited by the bolometer phonon and Johnson noise characterized by a critical temperature of 8.5 K. We show that, with proper sensor design, it is possible to reach the photon noise limit in video-rate submillimetre imaging applications.Keywords
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