6 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 invention discloses a lithium ion battery fault on-line detection device for non-contact magneto-impedance measurement. The device is composed of an operation host, a lock-in amplifier, a magnetic shielding barrel, a magnetic sensor probe group, a battery charging and discharging device, a lithium ion battery, a multi-degree-of-freedom non-magnetic micropositioner and a weak magnetic vibration isolation platform. Lithium electroplating of the lithium ion battery can generate metal lithium which is greatly different from electrode conductivity, and an internal conductivity algorithm based on magnetic field visualization can detect abnormal conductivity so as to detect occurrence of lithium electroplating; small current with specific frequency is superposed on charge and discharge current of the lithium ion battery, the magnetic sensor probe group scans magnetic field distribution on the surface of the battery to provide original data for a conductivity distribution calculation algorithm, and an upper computer sends a signal for changing a charging strategy to charging equipment according to a result to achieve the purpose of relieving lithium electroplating.

The invention relates to the technical field of magnetic sensors, in particular to a biosensor based on the off-diagonal GMI effect and a magnetic bead detection method.The sensor device comprises an off-diagonal giant magneto-impedance sensor, a PI film, an Au film, a crossed detection channel, a magnetic bead A, a magnetic bead B and a signal acquisition system; the non-diagonal giant magneto-impedance sensor is composed of a crossed magnetic core and an induction coil. A PI film is used as a substrate for sputtering Au, an Au film is a sputtered Cr / Au film, and a crossed detection channel is placed on the surface of the Au film and is used as a channel for magnetic bead detection. And the magnetic beads A and B are different superparamagnetic bead nanoparticles. The magnetic bead particles with superparamagnetism can generate a stray field under an external magnetic field, and when the magnetic bead particles are located on the surface of the magnetic sensor, the weak stray field generated by the magnetic beads can be detected by the magnetic sensor. By adopting an in-situ detection mode, high-sensitivity detection of two different magnetic beads can be realized at the same time.

The invention provides a high-sensitivity micro-magnetic field giant magneto-impedance sensor material as well as a preparation method and application thereof. The molecular formula of the high-sensitivity micro-magnetic field giant magneto-impedance sensor material is FeaSibBcCudNbeMf, M is a combination of more than two of metal elements Mn, V, Cr and Mo, a, b, c, d, e and f are atomic percentages of corresponding elements, a + b + c + d + e + f = 100, 73 < = a < = 74.5, 12.2 < = b < = 13, 7.2 < = c < = 9.5, 0.5 < = d < = 1, 2.1 < = e < = 2.8, and 0.6 < = f < = 2.5. The invention also provides a preparation method of the material. The GMI sensor material disclosed by the invention has excellent comprehensive soft magnetic performance, and can improve the sensitivity of a sensor and realize the detection of a micro magnetic field when being applied to the GMI sensor.

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.