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    • 6. 发明授权
    • Method and device for measuring a magnetic field with the aid of the faraday effect
    • 借助法拉第效应测量磁场的方法和装置
    • US06495999B1
    • 2002-12-17
    • US09637586
    • 2000-08-14
    • Ottmar BeierlThomas Bosselmann
    • Ottmar BeierlThomas Bosselmann
    • G01R3100
    • G01R15/246G01R15/247
    • A magnetic field is measured with the aid of the Faraday effect. Light is coupled into a Faraday element subjected to the magnetic field, the light having a linearly polarized first component at a first wavelength and an unpolarized second component at a second wavelength different from the first. A light signal is coupled out of the Faraday element and is split optically into a first light signal component with the first wavelength and a second light signal component with the second wavelength. A first measurement signal is derived from the first light signal component and a second measurement signal is derived from the second light signal component and these are used to form a corrected measurement signal S. In this way, attenuation influences in the transmission paths can be largely compensated for, even when measuring a magnetic field which is constant over time or a magnetic field with a component which is constant over time.
    • 借助法拉第效应测量磁场。 光耦合到受到磁场的法拉第元件中,所述光具有在第一波长处的线性偏振的第一分量和在第一波长处的第二波长的非偏振的第二分量。 光信号耦合在法拉第元件之外,并被光学地分离成具有第一波长的第一光信号分量和具有第二波长的第二光信号分量。 从第一光信号分量导出第一测量信号,并且从第二光信号分量导出第二测量信号,并且这些信号用于形成校正的测量信号S.以这种方式,传输路径中的衰减影响可以在很大程度上 补偿,即使在测量随时间恒定的磁场或具有随时间恒定的分量的磁场时。