CN2271716Y

CN2271716Y - A. C magnetizing strength measurer

Info

Publication number: CN2271716Y
Application number: CN 96223750
Authority: CN
Inventors: 吉争鸣
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-09-25
Filing date: 1996-09-25
Publication date: 1997-12-31
Anticipated expiration: 2006-09-25

Abstract

The utility model discloses an AC magnetizing strength measurer which relates to a measuring instrument, particularly a magnetization measuring instrument. The utility model is formed by that an excitation winding is wound on a half closed magnetic core; an active region is arranged between the gap of the magnetic core; the technology that pick-up voltage elicited from the anti-series coil between the gap of the magnetic core is connected with a phase shifter is adopted to make the intensity of a high-frequency magnetic field be enhanced under the situation that the volume of the high-frequency magnetic field is very small, and the problem of the phase shift is overcome in high-frequency magnetic field to make the average magnetization strength of a tested sample, and the relation of an alternating external field can dynamically display on the fluorescent screen of an oscillograph. The utility model has the advantage of simple structure.

Description

The ac magnetization ratemeter

The utility model relates to a kind of surveying instrument, particularly a kind of surveying instrument of ac magnetization intensity.

For the physical characteristics of more in depth studying magnetic material and the physical mechanism of magnetic characteristic, expand the new range of application of material, explore the new function of material, need measure the ac magnetization characteristic under the high frequency High-Field.But because the magnetic inertia effect of conventional electromagnet, the dc magnetizing strength that prior art can only be carried out under the slow scanning magnetic field is measured or the ac magnetic susceptibility measurement down of weak alternating-current field, so also can't measure, analyze, study the ac magnetization characteristic under the high frequency High-Field at present.For the test that specific (special) requirements is arranged, can't solve especially.

The purpose of this utility model will overcome above-mentioned defective exactly, designs a kind of instrument that can measure the magnetization characteristic under the high frequency High-Field.

The technical solution of the utility model: excitation supply, sample resistance serial connection field coil, the major technique feature is that field coil is on the semi-closure magnetic core, anti-series coil, correcting coil are set between the magnetic core slot, and the pick-up voltage of drawing from the anti-series coil connects phase-shifter.

Advantage of the present utility model and effect are and can measure the ac magnetization characteristic under the high frequency High-Field, thereby for the physical characteristics of magnetic material and the physical mechanism of magnetic characteristic are studied, explore new functional material, expand new range of application etc. a kind of new means are provided, especially to the test of specific (special) requirements is arranged, as to the research of superconductor etc., provide that volume is little, high field intensity, be easy to surveying instrument with cooled with liquid nitrogen, and the utility model simple in structure, be easy to use.

Accompanying drawing:

Fig. 1--structural representation of the present utility model.

Embodiment:

As shown in Figure 1, behind excitation supply 1, sample resistance 2 polyphones, be connected in series with field coil 3, field coil 3 is wound on the semi-closure magnetic core 4, anti-series coil 5, correcting coil 6 are set between the slot of magnetic core 4, and the pick-up voltage of drawing from anti-series coil 5 connects phase-shifter 7.

During test, sample 8 is positioned in one of them of anti-series coil 5, excitation supply 1 produces alternating magnetic field by field coil 3 between semi-closure magnetic core 4 slots, and anti-series coil 5 produces output voltage under this action of alternating magnetic field:

V_{o} = K \frac{d \overset{&OverBar;}{M}}{dt}

(M is the average magnetization of sample 8) is if magnetization current is sinusoidal wave form:

H=H _oCos ω t, then M can be expressed as:

M=M _o(H _o) Cos (ω t+ θ) (ignoring the harmonic wave composition) so, V _o=M _o(H _o) Cos (ω t+ θ+pi/2), can find out V thus _oAnd have pi/2 phase shift between the M,, eliminate the phase shift phenomenon, can detect the information of M so the pick-up voltage that anti-series coil 5 is drawn connects phase-shifter 7.

In the concrete test, connect oscillographic Y-axis after pick-up voltage connect phase-shifter 7, the magnetic field monitoring voltage at sample resistance 2 two ends is connect oscillographic X-axis, the relation of M and alternation external magnetic field can dynamically be presented on the video screen like this, and the alternating magnetic field between the slot of 6 pairs half closed magnetic core 4 of correcting coil plays the calibration effect.

Claims

1, ac magnetization ratemeter, excitation supply, sample resistance serial connection field coil is characterized in that field coil on the semi-closure magnetic core, and anti-series coil, correcting coil are between the magnetic core slot, and the pick-up voltage that the anti-series coil is drawn connects phase-shifter.