XU Jialong, ZHU Liwei, WANG Xiaoyu, et al. Design of Magnetic Field Measurement Unit Based on the Multi-layer and Cascade PCB Air-core Coil[J]. High voltageapparatus, 2016, 52(11): 81-87.
XU Jialong, ZHU Liwei, WANG Xiaoyu, et al. Design of Magnetic Field Measurement Unit Based on the Multi-layer and Cascade PCB Air-core Coil[J]. High voltageapparatus, 2016, 52(11): 81-87. DOI: 10.13296/j.1001-1609.hva.2016.11.014.
Design of Magnetic Field Measurement Unit Based on the Multi-layer and Cascade PCB Air-core Coil
this paper designs a measurement unit to measure the specific frequency signal of magnetic field accurately. Firstly
the linear function between the induction voltage and the magnetic field is built by the design parameters and structure of the measurement unit. Secondly
the bandpass filter amplifier circuit and the lock-in amplifier circuit are built to filter the power frequency electromagnetic interference and enhance the anti-interference ability of the measuring unit. The single and multiple circular current-carrying loop experiments in the lab show that the magnetic field measurement unit can detect the tiny magnetic field signal of required frequency
and the error is within 10%. The results show that the magnetic field measurement unit has a good performance
and meets the need of magnetic field measurement in the corrosion detection of grounding grid while the amplitude and frequency of AC excitation current are 1 A and 1 k Hz.