Abstract：The basic principles and characteristics of cross-correlators used in Johnson noise thermometry are described. A new digital correlator is presented based on commercial analog-to-digital converters and Lab VIEW software for the measurement of the thermal noise. High-precision synchronous dual-channel-sampling has been achieved by adjusting the phases of the external reference clocks. Experiments are carried out to validate the proposed approach and the results show that the new correlator is able to detect extremely small signals buried in the noise of the measurement circuits.
付云丰,屈继峰,张建强,周琨荔. 噪声温度计中新型数字相关器设计[J]. 计量学报, 2014, 35(4): 335-338.
FU Yun-fengQU Ji-feng, ZHANG,Jian-qiang，ZHOU Kun-li. A New Design of Digital Correlator for Johnson Noise Thermometry. Acta Metrologica Sinica, 2014, 35(4): 335-338.
2014, Vol. 35 
