the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
| 06 Jun 2024
Analysis of Orientation Errors in Triaxial Fluxgate Sensors and Research on Their Calibration Methods
Abstract. Three-axis magnetic flux gate sensors are widely used in Chinese geomagnetic observatories, but due to their directional errors, it is necessary to study error correction methods to improve measurement accuracy. Firstly, the mechanism of directional errors produced by three-axis magnetic flux gate sensors is analyzed, followed by the development of measurement tools for conducting directional error measurement experiments on the high-precision three-axis magnetic flux gate sensors of the Chinese FGM-01 series. Experimental results show that correcting the Z-axis and D-axis directional errors is essential. The observation data after error correction, whether in terms of the standard deviation of its all-day baseline values or the relative difference magnitude with the reference instrument, significantly decrease, demonstrating the clear correction effect and proving the effectiveness of this correction method.
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Status: open (until 12 Jul 2024)
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RC1: 'Comment on gi-2024-5', Anonymous Referee #1, 16 Jun 2024
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The work is devoted to calibration of three-axis fluxgate sensors intended for long-term magnetic field monitoring in geomagnetic observatories.
General note concerning methodology of sensor correction.
It is well known that 3-axis fluxgate magnetometers (FGM) need to be corrected for non-orthogonality and biases. Generally accepted method consists in rotation of the sensor in homogeneous magnetic field and calculation of non-orthogonality correction matrix 3x3 and bias correction matrix 3x1. This method gives excellent results for non-suspended sensors. (As far as I know, your GM4 device is of that type of instrument)
To my mind, there is a total confusion between bias and directional errors in your explanations. In lines 86-89 we see: “Furthermore, due to residual magnetism in the magnetic core, even if the spatial magnetic field intensity where the sensor is located is 0, there will still be a small offset output, causing the output value of the D-magnetic axis orientation to actually contain an offset value. This error is referred to as the D-magnetic axis directional error.”
By the way, what is: “spatial magnetic field intensity where the sensor is located is 0”? You, probably, mean an inhomogeneity of external magnetic field in sensor location?
Concerning your method of rotation of the sensor installed on turntable platform. Line 126: “We continued adjusting the three base screws to make the Z element's output values as close as possible at different positions.” In this case, you just aligned Z-axis of the magnetometer with rotation axis of the turntable. This direction is not a geo-vertical direction. So, you need to carefully explain your method.
Citation: https://doi.org/10.5194/gi-2024-5-RC1
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