Measurement range and linearity calibration method and device for alternating current magnetometer
A calibration method and technology of measurement range, which are applied to measurement devices, use electromagnetic devices to measure magnetic fields, measure magnetic variables, etc., can solve problems such as low precision, and achieve the effects of accurate and comprehensive acquisition, convenient calculation, and simple operation.
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Embodiment 1
[0063] This embodiment provides a method for calibrating the measuring range and linearity of an AC magnetometer, such as figure 1 As shown, the method includes the following steps:
[0064] placing the AC magnetometer in a calibration device, the AC magnetometer being located in a uniform area of the AC magnetic field of the calibration device;
[0065]In a preferred embodiment of the embodiment, after the magnetometer is placed in the calibration device, a step of preheating the magnetometer may also be performed first, for example, the magnetometer may be preheated for at least 15 minutes. After this preheating process, on the one hand, the temperature of the magnetometer itself, such as the temperature of its probe, tends to balance; on the other hand, the electronic performance of each electronic device in the magnetometer, such as the probe, etc. A process can tend to be stable, so that the performance of the entire magnetometer is in a stable state. In this way, cal...
Embodiment 2
[0082] This embodiment also provides an AC magnetometer measurement range and linearity calibration method, and the similarities with the above-mentioned embodiment 1 will not be repeated, and the difference is that:
[0083] In this embodiment, when adjusting the orientation of the measurement axis of the AC magnetometer, it may not be adjusted to the orientation with the maximum output value.
[0084] In addition, in this embodiment, the step of comparing the output data with the applied AC magnetic field to obtain the linearity of the AC magnetometer in the direction of the measuring axis further includes:
[0085] obtaining output voltage data in the output data;
[0086] performing linear fitting on the output voltage data and the strength value of the applied AC magnetic field to obtain a fitting curve;
[0087] The fitting curve is compared with the actual value of the applied AC magnetic field to obtain the linearity index of the AC magnetometer.
[0088] For example...
Embodiment 3
[0094] This embodiment provides an AC magnetic field linearity calibration device, which includes:
[0095] Calibration equipment for generating an AC magnetic field;
[0096] Such as figure 2 As shown, the calibration device 30 includes a magnetic field interference elimination system and a magnetic field generating device 301, wherein the magnetic field interference elimination system includes a three-axis compensation coil, an optical pump magnetometer, and an interference magnetic field compensation control system, and the magnetic field interference elimination system is used to eliminate The interference of the ambient magnetic field on said magnetic field. The magnetic field generator 301 is used to generate an AC magnetic field. In a preferred embodiment of this embodiment, the amplitude of the generated AC magnetic field ranges from 0 to ±100000 nT, and the frequency range ranges from 0.0001 to 100 kHz. In a more preferred embodiment, the frequency of the alternati...
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