SU1756813A1 - Method and device for determining ferrite content of a material - Google Patents

Abstract

Use: measuring equipment, testing magnetic materials. SUMMARY OF THE INVENTION: By displacing a constant magnetic field in a permanent magnetic field, the material magnetized simultaneously records the signal for a change in the induced emf induced in a conducting circuit. The resulting signal is detected in a unipolar pulse, amplified, integrated, and the content of ferrite in the material is determined from the integral value of the unipolar pulse. The device contains a ring-shaped permanent magnet 1 and a conducting circuit in the form of an inductor 2 connected to an inductor EMF recorder 3, made in the form of successively connected detector 4, amplifier 5. of integrator 6 and indicator 1. 2 s.o. f-ly, 2 ill.

Description

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The invention relates to a measurement technique, namely to the testing of magnetic materials,

There is a known method for determining the content of ferrite in a material, which includes placing a part of a sample in a magnetic field and measuring the force acting on the sample.

The disadvantage of the method is low accuracy due to the influence of the force meter.

The closest to the proposed technical solution is a method for determining the content of ferrite on a material, including magnetization of the material by moving it in a constant magnetic field, recording the measurement signal for the induction emf in a conductive loop when moving a magnetized material through it, and plotting the calibration content of ferrite in the material on the magnitude of the signal EMF induction.

A device for determining the content of ferrite in a material is known, which contains a permanent magnet and a dynamometer related to a T-sample of a material placed in a magnetic field.

The disadvantage of the device is low accuracy due to the influence of the force meter.

Closest to the proposed technical solution is a device for determining the content of ferrite in the material, which contains an annular permanent magnet and a conducting circuit in the inductance coil side, connected to the induction EMF recorder.

A disadvantage of the known device is low accuracy, due to the rate of material moving by the amount of the induced emf signal.

The purpose of the invention is to improve accuracy.

This goal is achieved in that according to the method for determining the content of ferrite in a material, including magnetization of the material by moving it in a constant magnetic field, recording the signal for a change in the induced emf in a conducting circuit while moving the magnetized material through it and plotting the graduated dependence of the content the ferrite in the material on the magnitude of the signal EMF induction, the magnetization of the material and the registration of the signal changes the EMF induction is carried out simultaneously, while the resulting signal L is detected in a uni-polar pulse, amplify and integrate it, and the ferrite content of the material determined

on the basis of the dependence on the integral value of the unipolar pulse.

The goal is also achieved by the fact that in a device for determining the content of ferrite in a material containing an annular permanent magnet and a conductive loop in the form of an inductor connected to an induction EMF recorder, the induction EMF recorder is made in the form of series-connected detectors, amplifier, integrator and indicator , and the conductive loop is rigidly fixed inside a ring-shaped permanent magnet,

Fig. 1 shows a schematic of an apparatus for determining the content of ferrite in a material; Fig. 2 shows the calibration dependence of the content of ferrite K in the material on the magnitude of the inductive emf signal U.

The device contains an annular permanent magnet 1 and a conductive circuit in the form of an inductor 2 rigidly fixed inside the annular magnet 1 and connected to the recorder 3 induction emf made in the form of serially connected detector 4, amplifier 5, integrator 6 and indicator 7,

The device works as follows.

The sample of the test material 8 is moved through the inner hole of the annular permanent magnet 1. When the sample 8 enters the field of the magnet 1, the sample 8 is magnetized, and when exited it is demagnetized. This change in the induction of the material causes the induction emf inductance of the detector 4 to be in the circuits of the coil. In this case, the electrical signal proportional to the ferrite content in the material is two pulses of different polarity. Detector 4 filters out the pulse of one polarity, after which the signal amplified by amplifier 5 is integrated by integrator 6 with visualization on indicator 7. According to the value of the received signal U using the groove dependence of FIG. 2, the content of ferrite K in the tested material is determined iale.

The method is carried out as follows.

By moving in a constant magnetic field, the material is magnetized and at the same time signal-induced changes in the induced emf about the conducting circuit are recorded. The received signal is detected in a single-pole pulse, amplified and integrated, and the ferrite content in the material is determined with. with the aid of the coupling dependence on the integral value of the one-polar pulse.

Claims (1)

Claim 1. Method for determining the content of ferrite in a material, including magnetization of a material by moving it in a constant magnetic field, recording the signal for a change in the emf of an induction in a conductive loop when moving a magnetized material through it, and plotting the calibration of the content of ferrite in the material on the magnitude of the emf signal induction, due to the fact that, in order to increase the accuracy, the magnetization of the material and the registration of the change signal of the induced emf are carried out simultaneously, and this received signal is detected in a uni-polar pulse, amplify and integrate it, and the content of ferrite in the material is determined by the calibration dependences on the integral value of the unipolar pulse. 2 A device for determining the content of ferrite in a material, comprising an annular permanent magnet and a conductive loop in the form of an inductance coil connected to an induction emf recorder, characterized in that, in order to improve the accuracy, the EMF iduction recorder is made in the form of a series-connected doctor / an amplifier, an integrator, and an indicator; and the conductive loop is rigidly fixed inside a ring-shaped permanent magnet. &, X