Magnetic-shielding eddy current sensor probe and method for reducing eddy current effect

Abstract

The invention discloses a magnetic-shielding eddy current sensor probe and a method for reducing eddy current effect, which relates to the technical field of eddy current sensors. The magnetic-shielding eddy current sensor probe comprises a measuring coil (1), a magnetic-shielding cover (3) and a winding framework (4), wherein the measuring coil (1) is wound on the winding framework (4); the measuring coil (1) and the winding framework (4) are placed in an inner hole of the magnetic-shielding cover (3) together; the magnetic-shielding cover (3) is at the other end of the measuring coil (1); the magnetic-shielding cover (3) is provided with 1 to 100 narrow slits (2) in the circumferential direction; the width of the narrow slits is 0.02 to 10 mm; and the depth of the narrow slits in the axial direction is 0.2 to 100 times the outer diameter of the measuring coil. By providing the end of the magnetic-shielding cover with the axial narrow slits (2) along the circumference, the pathway of eddy current is blocked, and the influence of the magnetic-shielding cover on the performance of eddy current sensors is reduced. The magnetic-shielding eddy current sensor probe can shield other AC magnetic fields around the sensor probe, and is small in size, thereby having great application prospects in the fields of magnetic bearings, motors, maglev trains and the like.

Description

1. Technical field [0001] The invention relates to a magnetically shielded eddy current sensor probe and a method for reducing the influence of eddy current electricity, belonging to the eddy current sensor technology. It can be applied in an environment with a magnetic field, by means of an eddy current sensor to measure the conversion circuit, and measure displacement in an environment with a magnetic field. 2. Background technology [0002] In non-contact displacement measurement, eddy current sensors are most widely used. The principle of measuring the displacement of the eddy current sensor is to wind a measuring coil on the probe of the eddy current sensor (the measuring coil is usually wound on a skeleton, and the skeleton and the coil are collectively called the eddy current sensor probe, sometimes simply referred to as the probe). After alternating current, a high-frequency magnetic field will be generated around the probe. When the measured object approaches or l...

AI Technical Summary

Problems solved by technology

[0004] Due to the existence of the magnetic shielding sleeve, the eddy current sensor probe will induce eddy current on the inner wall of the magnetic shielding sleeve during operation, resulting in a significant decrease in the Q value of the measuring coil (Q=XL / R, XL represents inductive reactance, R represents resistance), and decreases The resolution and measurement range of the eddy current sensor are improved

In order to be able to shield other AC magnetic fields and minimize the influence of the magnetic shielding sleeve on the performance of the eddy current sensor, the size of the magnetic shielding sleeve is usually large, which significantly affects the wide application of the magnetic shielding eddy current sensor probe in engineering.

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