Portable magnetometer theodolite with fluxgate sensor for earth's magnetic field component measurements

Abstract

Abstract. A new portable magnetometer theodolite with fluxgate sensor has been developed for measuring the components of the earth's magnetic field. With this instrument, used as a null detector, it is possible to make absolute measurements of declination (D) and inclination (I). The compensation of the main magnetic field allows direct intensity measurements (H, X, Y, Z components); in this case the calibration is made by reference to a proton magnetometer.The observation procedure is particularly easy and quick. The accuracy is better than 5 sec of arc for D and I and better than 1 nT for direct intensity measurements.

Analysis of Several Years of DI Magnetometer Comparison Results by the Geomagnetic Network of China and IAGA

“…Geomagnetic observatories use variometers to record the continuous variations of the geomagnetic field. The continuous absolute geomagnetic field can be determined by adding a value, known as the baseline and calculated by the absolute measurement results, to the variations (Bitterly et al, 1984;Jankowski and Sucksdorff, 1996). Therefore, for a geomagnetic observatory, the absolute measurements play a decisive role in the quality of continuous absolute value.…”

An evaluation of the uncertainty associated with the measurement of the geomagnetic field with aD/Ifluxgate theodolite

“…From the usual measuring procedure (exposed below) an estimation of those influence quantities, traditionally termed errors (namely collimation errors and zero-field offset), is obtained, most of them being typified in the literature and well known (Trigg 1970, Bitterly et al 1984, Kring Lauridsen 1985, Kerridge 1984, 1988. But the analysis of a long series of measurements with the DI flux reveals the existence of further influence quantities, whose origin has been suggested by some authors (Kring Lauridsen 1985, Rasson 2005, although a supporting theory remains to be established.…”