Low-noise readout of superconducting bolometers based on electrothermal feedback
Low-noise readout of superconducting bolometers based on electrothermal feedback
复制标题
基于电热反馈的超导辐射热测量计的低噪声读数
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
H. Seppä
中科院分区：
文献类型：
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作者：
J. Penttilä;H. Sipola;P. Helistö;H. Seppä
我们已经开发了一个简单的室温读出超导测辐射热计和量热计。由于电热反馈，测辐射热计可以与读出放大器噪声匹配。所构建的放大器由低噪声场效应晶体管组成，电压偏置由电反馈主动提供。根据我们对超导真空桥测辐射热计的测量，总噪声由测辐射热计声子和约翰逊噪声限制，其临界温度为8.5K。我们表明，与适当的传感器设计，它是可能的，以达到光子噪声限制在视频速率亚毫米成像应用。
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.