Giant magnetoresistance detection device of magnetostrictive displacement sensor

Abstract

The invention discloses a giant magnetoresistance detection device of a magnetostrictive displacement sensor. One end of a magnetostrictive strip is in fixed contact with the circumferential surface of a waveguide wire signal receiving end; a permanent magnet is horizontally placed above the other end of the magnetostrictive strip, and the magnetization direction of the permanent magnet is consistent with the length direction of the magnetostrictive strip; a giant magnetoresistive sensor is horizontally arranged below the other end of the magnetostrictive strip, and a tiny gap is kept between the giant magnetoresistive sensor and the lower surface of the strip; and a signal processing unit is electrically connected to the giant magnetoresistive sensor and is used for receiving a detection signal of the giant magnetoresistive sensor and analyzing and processing the detection signal. According to the invention, the size of the detection device is reduced, the detection sensitivity for a weak magnetic field is increased, the flight time of guided waves is measured more accurately, and the displacement measurement precision of the magnetostrictive displacement sensor is improved.

Description

technical field [0001] The invention relates to a piezomagnetic wave detection device, in particular to a giant magnetoresistance wave detection device of a magnetostrictive displacement sensor. Background technique [0002] In recent years, in order to meet the increasingly complex engineering requirements, a variety of high-precision sensors with different sensing quantities have been introduced into the control system for the detection and feedback adjustment of the state quantity of the entire system. [0003] As a detection device for measuring the absolute displacement value of an object, the magnetostrictive displacement sensor is widely used in hydraulic cylinder piston position feedback, oil storage tank liquid level monitoring, and precision machine tools due to its advantages of high precision, long life, and no need for regular calibration. Motion control and other multi-industry engineering fields. Its working principle is: when the displacement needs to be mea...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the background technology, the present invention provides a giant magnetoresistive detection device of a magnetostrictive displacement sensor, the purpose of which is to solve the problem that the current detection device of a magnetostrictive displacement sensor has insufficient response characteristics to weak magnetic field changes Thereby reducing the problem of displacement measurement accuracy

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