Measurements of the optical performance of bolometers for SPICA/SAFARI
Measurements of the optical performance of bolometers for SPICA/SAFARI
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SPICA/SAFARI 辐射热测量计光学性能的测量
DOI：
10.1117/12.925234
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
N. Trappe
中科院分区：
文献类型：
--
作者：
M. D. Audley;G. de Lange;Jiansong Gao;P. Khosropanah;M. Ridder;L. Ferrari;W. Laauwen;M. Ranjan;P. Mauskopf;D. Morozov;N. Trappe
我们测量了为SPICA卫星的远红外成像光谱仪SAFARI设计的探测器的光学响应。为了利用SPICA的冷却光学器件，SAFARI的三个测辐射热计阵列配备了极其灵敏的（NEP~2×10-19 W/√Hz）转变边缘传感器，其转变温度接近100 mK。SAFARI探测器的极高灵敏度和低饱和功率（~4 fW）为表征它们带来了挑战。因此，我们建立了一个超低背景测试设施，配备无冷冻剂的高容量稀释制冷机，并特别注意杂散光的排除。我们使用脉冲管冷却器预冷稀释制冷机，要求SAFARI探测器系统测试设备为探测器提供高度的电、磁和机械隔离。我们已经仔细地描述了测试设备在背景功率负载方面的性能。该测试设备设计灵活，易于重新配置内部照明器，使我们能够表征探测器的光学响应。我们描述了测试设施和我们采取的一些步骤，以创建一个超低背景测试环境。我们已经测量了两个探测器的光学响应设计的SAFARI的短波波段结合一个球形backshort和圆锥形喇叭。我们发现两者的总体光学效率为40%，而理想情况下预测的光学效率为66%。
We have measured the optical response of detectors designed for SAFARI, the far-infrared imaging spectrometer for the SPICA satellite. To take advantage of SPICA's cooled optics, SAFARI’s three bolometer arrays are populated with extremely sensitive (NEP~2×10-19 W/√Hz) transition edge sensors with a transition temperature close to 100 mK. The extreme sensitivity and low saturation power (~4 fW) of SAFARI’s detectors present challenges to characterizing them. We have therefore built up an ultra-low background test facility with a cryogen-free high-capacity dilution refrigerator, paying careful attention to stray-light exclusion. Our use of a pulse-tube cooler to pre-cool the dilution refrigerator required that the SAFARI Detector System Test Facility provide a high degree electrical, magnetic, and mechanical isolation for the detectors. We have carefully characterized the performance of the test facility in terms of background power loading. The test facility has been designed to be flexible and easily reconfigurable with internal illuminators that allow us to characterize the optical response of the detectors. We describe the test facility and some of the steps we took to create an ultra-low background test environment. We have measured the optical response of two detectors designed for SAFARI’s short-wave wavelength band in combination with a spherical backshort and conical feedhorn. We find an overall optical efficiency of 40% for both, compared with an ideal-case predicted optical efficiency of 66%.
SPICA-SAFARI 探测器系统：具有频分复用 SQUID 读数的 TES 探测器阵列
影响因子：
3.2
作者：
Jackson B
通讯作者：
Jackson B