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    MAGNETIC FIELD MEASURING APPARATUS AND FLUX QUANTUM CALCULATING METHOD
    2.
    发明申请
    MAGNETIC FIELD MEASURING APPARATUS AND FLUX QUANTUM CALCULATING METHOD 有权

    公开(公告)号：US20210103012A1

    公开(公告)日：2021-04-08

    申请号：US17062749

    申请日：2020-10-05

    申请人： Ricoh Company, Ltd. ,  KANAZAWA INSTITUTE OF TECHNOLOGY

    发明人： Takashi YASUI ,  Daisuke OYAMA

    IPC分类号： G01R33/035

    摘要： A magnetic field measuring apparatus includes a digital FLL circuit including ADC that converts a periodically changing voltage output from a SQUID according to a change in a magnetic field into a digital value, a digital integrator that integrates the digital value output from the ADC, a DAC that converts an integrated value output from the digital integrator into a voltage, a converter that converts the voltage output from the DAC into a current, and a coil that generates the magnetic field received by the SQUID, based on the current output from the converter. A calculating device calculates a digital value indicating a flux quantum based on the digital value output from the ADC when the ADC converts the periodically changing voltage output from the SQUID upon receiving the magnetic field generated by a current that is obtained by converting a voltage generated by a voltage generator.