Frequency multiplexed superconducting quantum interference device readout of large bolometer arrays for cosmic microwave background measurements
Frequency multiplexed superconducting quantum interference device readout of large bolometer arrays for cosmic microwave background measurements
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DOI：
10.1063/1.4737629
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发表时间：
2012-07-01
影响因子：
1.6
通讯作者：
Williamson, R.
中科院分区：
文献类型：
--
作者：
Dobbs, M. A.;Lueker, M.;Williamson, R.
采用在亚开尔文温度下工作的过渡边缘传感器测辐射热计的实验的一个技术里程碑是部署具有100 - 1000个测辐射热计的探测器阵列。这种阵列的一个关键技术是读出复用：能够在同一组导线上同时读出许多传感器。本文介绍了一种用于APEX-SZ和南极望远镜毫米波接收机的频域多路复用读出系统。在该系统中，探测器阵列被分成七个探测器的模块，并且模块内的每个测辐射热计被偏置有唯一的类似于MHz的正弦载波，使得各个测辐射热计信号在频率空间中被很好地分离。来自模块中所有测辐射热计的电流被加在一起，并使用在4K下工作的超导量子干涉设备进行预放大。室温电子设备解调载波以恢复测辐射热计信号，测辐射热计信号被单独数字化并存储到磁盘。该读出系统相对于检测器本身贡献很少的噪声，对不需要的颤噪激励非常不敏感，并且提供了多路复用更大数量的传感器的技术途径。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4737629]
A technological milestone for experiments employing transition edge sensor bolometers operating at sub-Kelvin temperature is the deployment of detector arrays with 100s-1000s of bolometers. One key technology for such arrays is readout multiplexing: the ability to read out many sensors simultaneously on the same set of wires. This paper describes a frequency-domain multiplexed readout system which has been developed for and deployed on the APEX-SZ and South Pole Telescope millimeter wavelength receivers. In this system, the detector array is divided into modules of seven detectors, and each bolometer within the module is biased with a unique similar to MHz sinusoidal carrier such that the individual bolometer signals are well separated in frequency space. The currents from all bolometers in a module are summed together and pre-amplified with superconducting quantum interference devices operating at 4 K. Room temperature electronics demodulate the carriers to recover the bolometer signals, which are digitized separately and stored to disk. This readout system contributes little noise relative to the detectors themselves, is remarkably insensitive to unwanted microphonic excitations, and provides a technology pathway to multiplexing larger numbers of sensors. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4737629]