Nanocrystalline high-frequency magnetic characteristic detection device and measurement method considering stress

Abstract

The invention discloses a nanocrystalline high-frequency magnetic characteristic detection system considering stress. The system comprises a nanocrystalline high-frequency magnetic characteristic detection device considering stress, a power amplifier, a differential amplifying circuit and a digital signal processing unit; the nanocrystalline high-frequency magnetic characteristic detection devicecomprises a magnetic path composed of two U-shaped magnetic cores which are in insertion connection with each other in a 90-degree staggered manner; a nanocrystalline strip is cut in an interdigital manner, so that the magnetic core can be formed; four square excitation windings are fixed on the top ends of the magnetic cores; the lower magnetic core is fixed on a bracket through a clamping buckle; a sample to be tested is arranged between the two magnetic cores; hydraulic clamps symmetrically distributed are applied to tow sides of the sample respectively; stress is applied to the sample; theupper magnetic core is fixed on the bracket through a height adjustable clamping buckle; and the detection system can be adaptive to samples of different sizes through adjusting the height of the magnetic cores. Compared with the prior art, the system has the advantages of single structure, clear and reasonable magnetic path and simplicity in the manufacture and processing of the magnetic cores.

Description

technical field [0001] The invention relates to a novel magnetic characteristic detection device, in particular to a nanocrystal high-frequency magnetic characteristic detection device and a measurement method under consideration of stress. Background technique [0002] The two-dimensional rotating magnetic characteristic detection technology is to excite the sample through the yoke, so that the sample to be tested is in the rotating magnetic field, and then through the B-H composite coil attached to the sample surface, the B signal and the H signal on the sample surface are collected, and the digital The signal processing process generates the B-H curve of the sample, thereby obtaining the magnetic properties of the sample. [0003] In the prior art magnetic property detection device, the material constituting the magnetic yoke is a silicon steel sheet, which is relatively low in saturation magnetic permeability and low in saturation magnetic force. The excitation winding ...

AI Technical Summary

Problems solved by technology

The excitation winding is made of ordinary single-twisted copper wire, and the winding impedance is relatively large. When the current is excited, the core loss and winding loss are relatively high, and the magnetic characteristic detection of the sample under the high-frequency rotating magnetic field cannot be realized, which limits the magnetic properties. The scope of use of materials

[0004] The magnetic property detection device in the prior art does not have a stress applying device, and cannot detect the magnetic property of the sample under the condition of applied stress

The distance between the yokes cannot be adjusted arbitrarily, and the steps to replace the sample are cumbersome, which also limits the shape and size of the sample to be tested

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