Design and calibration of a cryogenic blackbody calibrator at centimeter wavelengths
Design and calibration of a cryogenic blackbody calibrator at centimeter wavelengths
复制标题
厘米波长低温黑体校准器的设计和校准
DOI：
10.1063/1.1821622
复制
发表时间：
2004
影响因子：
1.6
通讯作者：
P. Lubin
中科院分区：
文献类型：
--
作者：
A. Kogut;Edward J. Wollack;D. Fixsen;M. Limon;P. Mirel;S. Levin;M. Seiffert;P. Lubin
我们描述的设计和校准的外部低温黑体校准器用于宇宙学，天体物理学和漫发射（ARCADE）仪器的绝对辐射计的前两个航班。校准器由弱耦合到超流液氦浴的微波吸收器组成。离轴30°观察的半波波纹在紧凑的基底面内将回波损耗降低到−35 dB以下。 嵌入在吸收器内的氧化钌电阻温度计监测校准器表面的温度。热校准使用飞行温度计读出系统将参考温度计的校准传递到飞行温度计。校准器温度测量是稳定的时间超过四年，在2.7 K附近的2 mK的顺序的温度校准的统计不确定性，主要限制在液氦浴的热波动。 对超流转变的观测表明，绝对温标在一定范围内是准确的。
We describe the design and calibration of an external cryogenic blackbody calibrator used for the first two flights of the Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE) instrument. The calibrator consists of a microwave absorber weakly coupled to a superfluid liquid helium bath. Half-wave corrugations viewed 30° off axis reduce the return loss below −35 dB within a compact footprint. Ruthenium oxide resistive thermometers embedded within the absorber monitor the temperature across the face of the calibrator. The thermal calibration transfers the calibration of a reference thermometer to the flight thermometers using the flight thermometer readout system. The calibrator thermometry is stable in time over four years, with statistical uncertainty in the temperature calibration of order 2 mK near 2.7 K, limited primarily by thermal fluctuations in the liquid helium bath. Observations of the superfluid transition demonstrate that the absolute temperature scale is accurate withi...