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    • 10. 发明授权
    • SQUID fluxmeter having a pulse mulliplication circuit number for
accurately measuring large rates of change in flux
    • SQUID通量计具有脉冲容错电路号,用于精确测量通量变化的大变化
    • US5424641A
    • 1995-06-13
    • US96401
    • 1993-07-26
    • Kohtaroh Gotoh
    • Kohtaroh Gotoh
    • G01R33/035H01L39/22H03K23/76
    • G01R33/0356Y10S505/83Y10S505/846
    • A SQUID fluxmeter, which object is to accurately measure magnetic flux even if the input magnetic flux is largely changed in a short time, includes an 1-input superconducting OR gate for outputting pulses to the number of i in response to one input pulse from a SQUID, an AC bias current source for outputting a current I.sub.C of variable frequency 4if to a bias input node of the OR gate, an up/down counter for counting pulses from the SQUID and a control circuit for outputting a control signal CSi to the AC bias current source corresponding to the time differential value of the count value C1 of the counter and present value i. The response speed of the magnetic flux feedback through the feedback coil to the SQUID in response to the magnetic flux input to the SQUID is thereby made i times higher than that in the prior art.
    • 即使输入磁通量在短时间内发生很大变化,也能够精确地测量磁通量的SQUID磁通计包括:1输入超导或门,用于响应于来自一个输入脉冲的一个输入脉冲将脉冲输出到i个数 SQUID,用于将可变频率4if的电流IC输出到或门的偏置输入节点的AC偏置电流源,用于对来自SQUID的脉冲进行计数的上/下计数器和用于向AC输出控制信号CSi的控制电路 对应于计数器的计数值C1的时间微分值和当前值i的偏置电流源。 因此,响应于输入到SQUID的磁通量,通过反馈线圈反馈到SQUID的磁通量的响应速度比现有技术高出一倍。