Three-Axis Teslameter with Integrated Hall Probe Free from the Planar Hall Effect

摘要

The first commercially available teslameter with a fully integrated 3-axis Hall probe is described. The Hall probe chip contains horizontal and vertical Hall elements, analogue electronics, and a synchronisation circuit. A horizontal Hall element measures the perpendicular component, and two vertical Hall devices measure the two in-plane components of a magnetic field. Current spinning in the Hall devices cancels offset, 1/f noise, and the planar Hall voltage. The analogue electronic module of the teslameter cancels the residual offset and compensates temperature dependence and non-linearity of the Hall voltages. The digital module provides A/D conversion and communication to a computer.