Wang Qinge, 1989. "A Helium (He4) Optically Pumped Magnetometer Suitable for Airborne Measurements", An Overview of Exploration Geophysics in China — 1988, Zhao Jingxiang, Wang Yanjun, Fu Xuexin, Stanley H. Ward
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The principle of automatic tracking of a helium (He4) optically pumped magnetometer is described, with the frequency spectra of aeromagnetic anomalies analyzed and a bandwidth necessary for an airborne magnetometer proposed. Based on the bandwidth, the transfer function for the magnetometer is suggested as.
To the variations of a magnetic field, the tracking error can be estimated from the transfer function.
To make the tracking error less than the width of magnetic resonance, an additional high-speed tracking loop is suggested, which resulted in improvements in filtering for a gently varying magnetic field and high sensitivity. Because of the auxiliary loop, the tracking function to a fast varying magnetic field was improved resulting in improved measurements.