Design And Development Of Distributed Magnetic Measurement System Based On Hall Array

The magnetic field immunity research and test platform is an important device used to study the interference of strong stray magnetic fields and test the magnetic field tolerance of commonly used equipment.The size of the test area,the minimum magnetic field in the test area and the uniformity of the magnetic field in the test area are the key design indicators.In order to verify whether the test magnetic field generated by the magnetic field immunity research test platform meets the design requirements and at the same time realize the calibration of the test platform’s operating parameters,it is necessary to measure the magnetic field distribution within the test area to obtain the test magnetic field information.In this paper,the problem of magnetic field distribution measurement in the test area of the large-aperture,highintensity magnetic field immunity research test platform is researched,and a distributed magnetic field measurement device based on a Hall array is developed.A measurement scheme for magnetic field distribution characteristics is designed and successfully applied Parameter calibration of 0.3m/200 m T magnetic field immunity research test platform.The specific research work of this article is as follows.Firstly,the design and calibration of the magnetic field measuring probe based on the Hall element is completed.According to the high-intensity magnetic field measurement requirements,the HG-302 C Hall element with large range,high linearity and good temperature characteristics was selected as the measurement probe.Aiming at the calibration problem of the measuring probe,a toroidal solenoid type high-intensity magnetic field generator with an air gap is designed,which can generate a 500 m T uniform steady-state magnetic field for probe calibration.Designed a sampling conditioning circuit with following,amplifying,filtering and other functions,combined with F.W.Bell Technology’s 5180 Hall-effect Gauss meter and highintensity magnetic field generator to complete the test and calibration of the output characteristics of the sampling conditioning circuit.Secondly,the design of Hall array and multi-channel signal acquisition system is completed.The distribution law of the magnetic field in the test area of the test platform is analyzed,and the distributed magnetic field measurement scheme is determined.For distributed magnetic field measurement,a 15-way Hall probe array based on strip PCB is designed,and the measurement spatial resolution reaches 2cm.For the acquisition of multi-channel measurement data,a 15-channel signal acquisition system based on Lab VIEW is designed,a virtual instrument with the functions of real-time acquisition,processing,display and storage of multi-channel signals.Finally,a distributed magnetic field measurement system based on the Hall array is developed,and the magnetic field distribution measurement of the 0.3m/200 m T magnetic field immunity research test platform is completed,which proves that the measurement system designed in this paper meets the design requirements and can be used for distributed Magnetic field measurement.The magnetic field distribution measurement in the test area of the magnetic field immunity research test platform is the basis of the verification platform design and calibration platform operating parameters.The distributed magnetic field measurement system designed in this paper can meet the calibration of the 0.3m/200 m T magnetic field immunity research test platform.It can also provide a reference for the distributed magnetic field measurement of a large-scale magnetic field immunity research and test platform in the future.