Calibration Of Air-Core Sensor By Braunbeck Coil

The electromagnetic detection in the earth-space frequency domain, the measurement system converts the magnetic field signal into an electrical signal representing the magnetic field signal. In order to accurately obtain the relationship between the magnetic field signal and the electrical signal, the hollow coil sensor must be calibrated to avoid the influence of coil parameters on the accuracy of data acquisition. In order to calibrate the large coil in the electromagnetic detection system, this paper introduces a measurement system for calibrating the air-core coil sensor. The mechanism of generating computable standard low-frequency magnetic field based on square Braunbeck coil is expounded, and the measurement system is designed. At the same time, the source of the uncertainty of calibration standards is analyzed, and the extended uncertainty at 512Hz is evaluated as an example. Compared with the theoretical calculation value, the method in this paper is proved to be reliable.