3 results about "Magneto impedance" patented technology

The present invention relates to a magnetic sensor. The object of the present invention is to improve the sensitivity of a magnetic sensor using a sensing element that senses a magnetic field by a magnetoimpedance effect. The solution of the present invention is that a magnetic sensor (200) is provided with: a sensing element (10) that senses a magnetic field by a magnetoimpedance effect; and a concentrating member (20) that is provided opposite to the sensing element (10), the concentrating member (20) being composed of a soft magnetic body and concentrating magnetic lines of force from the outside to the sensing element (10).

The application relates to a differential non-diagonal giant magnetoimpedance current sensor, a test system and a current measurement method, which comprises two non-diagonal giant magnetoimpedance current sensors with the same structure and based on the same working principle, the independent annular soft magnetic strips on the sensors and the solenoid coil are used to avoid the influence of the soft magnetic material itself on the measurement process; a compensation wire through which a current with the same size and opposite direction to the current in the wire to be measured is arranged to filter the disturbance of the geomagnetic field on the current measurement; meanwhile, a signal processing unit is arranged to carry out denoising and differential amplification processing on the induced voltage signals from the two non-diagonal giant magnetoimpedance current sensors, eliminate the disturbance of the geomagnetic field, suppress the common-mode noise of the magnetic sensor, and significantly improve the current detection precision and anti-interference ability of the sensor. The application focuses on the common problem of geomagnetic field interference in current measurement, effectively eliminates the interference signals while keeping the characteristics of simple sensor structure and high sensitivity.

The present invention relates to a device and method for detecting a weak magnetic field on a surface of an object based on the giant magnetoimpedance effect. A method for measuring a magnetic field includes positioning a giant magnetoimpedance probe at a first position near a surface of an object to be measured; applying an alternating current to the giant magnetoimpedance probe and measuring a first alternating voltage of the giant magnetoimpedance probe; calculating an impedance based on the alternating current and the first alternating voltage and determining a first magnetic field based on the impedance; positioning the giant magnetoimpedance probe at a second position above the first position; applying the alternating current to the giant magnetoimpedance probe and measuring a second alternating voltage of the giant magnetoimpedance probe; calculating an impedance based on the alternating current and the second alternating voltage and determining a second magnetic field based on the impedance; and calculating a measured magnetic field at the first position based on the first magnetic field and the second magnetic field.