A Measuring Method of Magnetic Field Component with Optical Pumping Magnetometer and Its Error and Stability Related to the Compensating Field.
In this paper are discussed observations of magnetic field components with optical pumping magnetometers concerning their methods of measurement and observational error and accuracy, especially in the case of declination measurement. A device of D-component observation should be such a complicated one as combination of H-component and Hy-component observations which are made with independent optical pumping magnetometers，where Hy is component of H in a suitable direction fixed in the horizontal plane. According to the present result of detailed study on the observational error, such a very high stability in direction of the compensating magnetic field as about 0.5" is necessary for the accuracy of ±0.1γ or 0.01' in the measurement of each component. On the other hand, the accuracy of compensation of the perpendicular magnetic field should be 20γ〜30γ in the most severe case, i.e. in D-component, to obtain the same accuracy of measurements.