Method for calibrating verticality of magnetic shaft of three-shaft magnetic sensor

Abstract

The invention discloses a method for calibrating verticality of a magnetic shaft of a three-shaft magnetic sensor. A three-dimensional magnetic field generator and a nonmagnetic rotary table are adopted, the three-dimensional magnetic field generator and the nonmagnetic rotary table are arranged at first; the magnetic sensor which needs to be calibrated is fixed on the rotary table; a large magnetic field ranging from top to bottom is generated by the magnetic field generator, so that a numeric value measured by the sensor is not zero; the zero position of the rotary table is marked, the angle values of three shafts of the rotary table are recorded, and three shafts of the rotary table are rotated, so that the outputs of a shaft m and a shaft n of the sensor are zero and the angle values of the three shafts of the rotary table are recorded; the three shafts of the rotary table are rotated again, so that the outputs of a shaft m and a shaft n of the sensor are zero and the angle values of the three shafts of the rotary table are recorded; transformation relation between each shaft m, n and p of a coordinate O and each shaft x3y3z3 of the coordinate O3 can be obtained by calculating multiple recorded angle values so as to obtain a calibration result. The method is simple and feasible, high in accuracy and small in errors.

Description

technical field [0001] The invention relates to a calibration method for the perpendicularity of the magnetic axis of a three-axis magnetic sensor. Background technique [0002] Magnetic field detection, especially the precise detection of weak magnetic fields, has been involved in important fields such as national defense construction, scientific research, industrial production and daily life, such as environmental magnetic field monitoring, geomagnetic field research, oil and mineral exploration, non-destructive detection of magnetic materials, surface and underwater ship weapons Reconnaissance, cosmic space magnetic field measurement and other aspects. In order to accurately detect the magnetic field, the research on magnetic measurement methods and magnetic measurement instruments is the key. [0003] Magnetic field sensors are one of the key devices in the field of electronic measurement and the development of high-level control systems. Magnetic sensors and related de...

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Problems solved by technology

[0008] Aiming at the drawbacks of the current three-axis non-orthogonal perpendicularity error measurement method, the present invention proposes a three-axis magnetometer magnetic axis perpendicularity calibration method that can achieve high precision, is not limited by the range of the measuring instrument, and is not limited by the precision of the generated magnetic field.

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