Abstract: With the development of magnetic sensor technology and magnetic detection technology, magnetic gradient tensor measurements have become a new method in magnetic detection field. However, magnetic sensors in the detection array always have non-parallelism, thus reducing the magnetic positioning accuracy. A simple and convenient method called phase-difference algorithm is presented for measuring the non-parallelism of the sensors. Testing results indicates the validity of the method.

Key words: +Magnetic Sensor Array, ⁺Phase-difference algorithm, +Non-parallelism, Measurement method