Calibration method and device for magnetometer sensor
A calibration method and technology for calibrating devices, which can be applied to measuring devices, instruments, measuring magnetic variables, etc., can solve problems such as inaccurate calibration of magnetometer sensors
Active Publication Date: 2020-11-20
GOERTEK INC
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Problems solved by technology
[0004] In view of the above problems, the object of the present invention is to provide a calibration method and device for a magnetometer sensor, to solve the current problem of inaccurate calibration of the magnetometer sensor due to environmental differences
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[0019] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0020] Aiming at the aforementioned inaccurate calibration of the magnetometer sensor due to environmental differences, the present invention adjusts the magnetic field strength in the movement space of the product to be calibrated through the Helmholtz coil, and after making the magnetic field in the movement space relatively stable and uniform, Fix the product to be calibrated, and then make a 360-degree rotation of the product to be calibrated along the vertical direction of the motion space, while the magnetometer sensor of the product to be calibrated moves along the X-axis of the motion space , Y-axis or Z-axis rotate 360 degrees to obtain calibration data distributed on the X-axis, Y-axis and Z-axis respectively in the motion space; then determine the calibration value of the magnetometer sensor of the product to be calibrated accordin...
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The invention provides a method and device for calibrating a magnetometer sensor, wherein the method comprises: adjusting a magnetic field strength in the motion space of a product to be calibrated bya Helmholtz coil in order that the magnetic field in the motion space is relatively stable and uniform; fixing the product to be calibrated, and rotating the magnetometer sensor of the product to becalibrated by 360 degree along the X-axis, the Y-axis or the Z-axis of the motion space according to a preset rotation ratio while rotating the product to be calibrated by 360 degrees in the verticaldirection of the motion space every time so as to acquire calibration data distributed on the X-axis, the Y-axis, and the Z-axis of the motion space; and determining the calibration value of the magnetometer sensor of the product to be calibrated based on the acquired calibration data. The method and device can dynamically calibrate the magnetometer sensor, are not affected by the difference of factory magnetic field environments, can meet the simultaneous operation of multiple devices, and are suitable for the calibration and detection of a large batch of magnetometer sensors.
Description
technical field [0001] The present invention relates to the technical field of magnetometer calibration, and more specifically, to a calibration method and device for a magnetometer sensor. Background technique [0002] Three-axis magnetic sensors are widely used in electronic products such as 3-DOF and 6-DOF game controllers, headsets, etc., to obtain the function of the user's motion orientation. Ideally, the spatial surface of the three-axis magnetic field is a positive sphere, but the magnetometer sensor will have deviations in its readings due to various reasons, resulting in more magnetic field deviations, so it is necessary to limit the readings of the magnetometer sensor by calibration Within the effective measurement range, the scale deviation of the measurement is calculated so that it conforms to the output of the direction and strength of the magnetic field, and the stability and accuracy of the overall output data of the magnetometer sensor are improved. [000...
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IPC IPC(8): G01R33/00
CPCG01R33/0035
Inventor 蔡文龙鞠洪德谭礼君
Owner GOERTEK INC