HIGHLY SENSITIVE MAGNETOIMPEDANCE SENSOR OF GRADIENT MAGNETIC FIELDS Russian patent published in 2022 - IPC H01L43/00 

FIELD: sensors.

SUBSTANCE: invention relates to semiconductor electronics, namely, to the field of highly sensitive magnetic sensors based on the magnetoimpedance effect to be applied in medicine and geology. The technical result is achieved as follows. Highly sensitive magnetoimpedance sensor of gradient magnetic fields comprises a gradient sensing element, amplifiers, and a microcontroller. The sensor is characterised by additionally including a magnetising solenoid, a pulse-width modulator, and a temperature sensor are additionally introduced into it, while the gradient sensing element comprises at least two series-connected magnetoimpedance elements placed inside the homogeneous region of the magnetic field of the magnetising solenoid, consisting of amorphous ferromagnetic microwires in glass insulation and copper wire coils with back-to-back windings connected to the inputs of the modulator amplifiers. The inputs of the microcontroller are connected to the outputs of the modulator amplifiers, the temperature sensor, the magnetising solenoid, and the intermediate tap of the sensing element, and the outputs of the microcontroller are connected to the inputs of the magnetising solenoid and the modulator amplifiers, wherein the input of the sensing element is connected to the output of the pulse width modulator. Another characteristic feature of the sensor consists in the magnetoimpedance elements being arranged in a single line one after another, with the distance between the elements not less than 5 mm for segments of an amorphous ferromagnetic microwire in a glass shell with a diameter of 36 mcm and a length of 3 mm. Another characteristic feature of the sensor consists in the magnetoimpedance elements being parallel to each other, with the distance between the elements not less than 10 mm for segments of an amorphous ferromagnetic microwire in a glass shell with a diameter of 36 mcm and a length of 3 mm.

EFFECT: better operating capabilities of the sensor, higher accuracy of measurement, expanded range of measurement of gradient magnetic fields and temperature stabilisation of the apparatus.

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