摘要
该文报道了利用谐振变压器作为耦合网络,其传输比及Q值对超导磁强计性能的影响。阻抗匹配后的前置放大器噪声系数达2.3dB。耦合网络的Q值为2.5,它使磁强计有足够高的摆率和较宽的频响。 该文还介绍了改进后的模拟SQUID及其所构成的实验装置。这种装置能用于耦合网络的设计及系统摆率和频响的预测。
This paper reports the resonant transformer as the coupling network between dc SQUID and preamplifier of dc SQUID magnetometer and investigates the effect of the transfer ratio and Q value of the resonant transformer on the performance of magnetometer.After impedance matching, the noise coefficient of preamplifier is 2.3 dB, the Q value of network equals 2.5 which enables the magnetometer to have high slew rate and wide frequence response.The SQUID simulator is improved and used to fabricate an experimantal equipment.This equipment is used in our design for network, and it is capable of estimating the slew rate and frequence response of dc SQUID magnetometer.
出处
《低温与超导》
CAS
CSCD
北大核心
1991年第1期57-64,共8页
Cryogenics and Superconductivity
