Negative feedback readout system for multiferroic magnetic sensor

Abstract

The invention discloses a negative feedback type readout system for a multiferroic magnetic sensor. The system comprises a signal processing module, a modulation module, a feedback circuit and a magnetic field generation unit. The input terminal of the signal processing module is connected with a multiferroic magnetic sensor; the modulation module is connected with a reference signal terminal of the signal processing module; the modulation module modulates input terminal signals of the signal processing module at the same time, the output terminal of the signal processing module is connected with the input terminal of the feedback circuit, the output terminal of the feedback circuit is connected with the magnetic field generation unit, the magnetic field generation unit generates a feedback magnetic field, and the output terminal of the signal processing module serves as a signal reading terminal. The feedback module is introduced and a feedback magnetic field is generated by the feedback module, so that the multiferroic magnetic sensor is in a stable magnetic field environment, and then a working point of the multiferroic magnetic sensor is locked; therefore, the measuring range of the sensor does not depend on a linear interval of the sensor, but depends on the feedback module, so that the magnetoelectric sensor is ensured to have an ultra-wide linear working interval.

Description

technical field [0001] The invention relates to the field of magnetic field measurement, in particular to a negative feedback readout system for multiferroic magnetic sensors. Background technique [0002] The magnetoelectric coupling effect refers to the phenomenon that materials generate electrical polarization under the action of an external magnetic field or materials generate magnetization under the action of an external electric field. Therefore, in a material system with both piezoelectric and magnetostrictive effects, the change of the external magnetic field can generate an electrical signal response through the magnetoelectric coupling effect, and the electrical signal response has a linear relationship with the amplitude of the external magnetic field within a certain range. At present, after good shielding treatment, magnetoelectric materials can detect 1.2*10 -10 The AC magnetic field of T; the high magnetic permeability and strong magnetic anisotropy of the am...

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Problems solved by technology

[0005] Aiming at the problem that the sensitivity of the prior art depends on the linear range of the magnetic field-voltage characteristic curve of the magnetoelectric material itself, the requirements for the design of the magnetoelectric material are relatively high, and the working area of ​​the magnetic field measurement is narrow, the invention provides a multiferroic The negative feedback readout system of the magnetic sensor, through the form of negative feedback, no longer depends on the linear region in the magnetic field-voltage characteristic curve, so that the magnetic field-voltage conversion coefficient will mainly depend on the feedback module, not the multiferroic magnetic sensor itself , can linearize the nonlinear magnetic field-voltage characteristic curve, greatly improve the measurement sensitivity, greatly increase the range, and simple structure, low cost, low power consumption, can be realized at room temperature, and easy to integrate

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