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    Magnetic field bias adjusting device for a SQUID modulation drive circuit
    2.
    发明公开
    Magnetic field bias adjusting device for a SQUID modulation drive circuit 有权
    Verfahren und Vorrichtung zum Einstellen der Magnetfeldpolarisationfürden Modulationsansteuerschaltkreis eines SQUIDs

    公开(公告)号：EP1054262A2

    公开(公告)日：2000-11-22

    申请号：EP00401307.4

    申请日：2000-05-12

    申请人： Sumitomo Electric Industries, Ltd.

    发明人： Nagaishi, Tatsuoki, Itami Works Sumitomo El.In.Ltd ,  Hirano, Tetsuya, Itami Works Sumitomo Elec.Ind.Ltd ,  Itozaki, Hideo, Itami Works Sumitomo Elec.Ind.Ltd

    IPC分类号： G01R33/035

    CPC分类号： G01R33/0356 ,  Y10S505/846

    摘要： A modulation current at a predetermined frequency f is applied from an AC source to a flux locked loop for maintaining magnetic flux supplied to a SQUID (10) at a constant value. An output voltage is picked out from the SQUID (10) in this state to which a predetermined bias current is being applied from a current and field bias application circuit (11), and the picked out voltage passed through a filter (13) and a rectifier (14) is monitored by a voltage monitor (15). The filter (13) picks out a frequency component of 80 kHz which is twice as high as the frequency component f, 40 kHz, applied from the AC source, and maximizes it. In this way, a method and a device for easily adjusting magnetic field bias in a modulation drive circuit for a SQUID can be provided.

    摘要翻译： 将预定频率f的调制电流从AC源施加到磁通锁定环，用于将提供给SQUID（10）的磁通保持在恒定值。 在从电流和场偏置施加电路（11）施加了预定偏置电流的状态下，从SQUID（10）中取出输出电压，并且所选择的电压通过滤波器（13）和 整流器（14）由电压监视器（15）监视。 滤波器（13）选出80kHz的频率分量，其是从AC源施加的频率分量f，40kHz的两倍，并使其最大化。 以这种方式，可以提供用于容易地调整用于SQUID的调制驱动电路中的磁场偏置的方法和装置。