440results about "Magnetic field offset compensation" patented technology

The invention provides a single chip difference free layer push-pull type magnetic field sensor electric bridge and a preparation method thereof. The magnetic field sensor electric bridge comprises a substrate, a staggered soft magnetic flux concentrator array and a GMR spin valve or a TMR magnetic resistor sensor unit array which is placed on the substrate and has an X-direction magnetic sensitive direction. Each soft magnetic flux concentrator comprises edges parallel to the X axis, edges parallel to the Y axis and four corners, and the four corners are sequentially marked as A, B, C and D from the upper left position in the clockwise direction. Magnetic resistor sensor units are placed at the gaps between the soft magnetic flux concentrators. Meanwhile, the magnetic resistor sensor units corresponding to the corners A and the corners C of the soft magnetic flux concentrators and the magnetic resistor sensor units corresponding to the corners B and the corners D are defined as push magnetic resistor sensor units and pull magnetic resistor sensor units respectively. The push magnetic resistor sensor units are electrically connected to form one or more push arms, the pull magnetic sensor units are electrically connected to form one or more pull arms, and the push arms and the pull arms are electrically connected to form a push-pull type sensor bridge. According to the single chip difference free layer push-pull type magnetic field sensor electric bridge and the preparation method therefore, the power consumption is low, the magnetic field sensitivity is high, and a magnetic field in the Y direction can be measured.

A calibratable magnetic field sensor for sensing a first and a second spatial component of a magnetic field in a reference point, wherein the magnetic field includes a first and a second measurement field component and / or a first and a second calibration field component. The magnetic filed sensor includes a first sensor element arrangement including at least a first and a second sensor element for sensing the first magnetic field component, which includes a first measurement field component and / or a first calibration field component, with respect to a first spatial axis in the reference point. Furthermore, the magnetic field sensor includes a second sensor element arrangement for sensing the second magnetic field component, which includes a second measurement field component and / or a second calibration field component, with respect to a second spatial axis in the reference point. The magnetic filed sensor also includes an excitation line arranged with respect to the first sensor element arrangement so that, when impressing a default current into the excitation line, a pair of different asymmetrical default calibration field components in the first sensor element and in the second sensor element is generated with respect to the first spatial axis in the first sensor element arrangement, wherein the two spatial axes pass along linearly independent position vectors.

A magnetic field measurement system that includes at least one magnetometer; at least one magnetic field generator; a processor coupled to the at least one magnetometer and the at least one magnetic field generator and configured to: measure an ambient background magnetic field using at least one of the at least one magnetometer in a first mode selected from a scalar mode or a vector mode; generate, in response to the measurement of the ambient background magnetic field, a compensation field using the at least one magnetic field generator; and measure a target magnetic field using at least one of the at least one magnetometer in a spin exchange relaxation free (SERF) mode which is different from the first mode.