SU1226262A2 - Pulse magnetic analyser - Google Patents

Abstract

The invention relates to non-destructive magnetic control of the mechanical properties of ferromagnetic materials and products and can be used in any part of the national economy. The purpose of the invention is to increase the reliability of the analysis by providing a high stability of the magnitude of the intensity of the residual magnetization field. The pulsed magnetic analyzer contains a series-connected generator, a ferro probe-gradiometer, a selective amplifier, a synchronous detector, the control input of which is connected to a generator, an integrator and an indicator, a 1-pole current source and the first magnetizing element, and series-connected clock pulses 1pulses current and the second magnetizing element, made in the form of a solenoid and located concentrically with the first magnetizing element. 3 il. Additional to a.c. W 998934. i sl to GhE 05 to a to

Description

The invention relates to non-destructive magnetic control of the mechanical properties of ferromagnetic materials and products, can be used in any branch of the national economy and is an improvement of the known pulse magnetic analyzer according to the author. No. 998934

The purpose of the invention is improving the reliability of the analysis.

FIG. 1 shows a block diagram of a pulse magnetic analyzer; in fig. 2 - mutual arrangement of magnetizing elements (solenoids); Fig. 3 shows oscillograms of magnetization pulses.

The pulse magnetic analyzer contains a generator 1, a ferrozond-gradiometer 2 connected to it, connected to the latter a series-connected selective amplifier 3j synchronous detector 4, the control input of which is connected to the generator 1, integrator 5, indicator 6 and identical coils 7, source B - spike current and the first magnetizing element connected to it 9

The analyzer also contains a series-connected generator 10

synchronous pulse 1, the source of 11 current-carrying current pulses and the second magnetizing element 12 located concentrically with the first, the pulse current source 8 is controlled and connected to the second output of the generator 10 synchronous pulse

The magnetic analyzer operates as follows.

The magnetizing elements 9 and 12 (solenoids) are mounted on the surface of a controlled product (not shown). The pulses of the generator 10 sync pulses are fed to the inputs of the source 8 of the pulsed current and the source 11 of different current pulses, which are formed by the current pulses of 3 corresponding solenoids, the passage of which gives rise to magnetic field pulses for magnetization of the controlled product. A current pulse passes through the magnetizing element 9 (Fig. 2) through the current amplitude Hj, and along: the element 12 simultaneously with it - impulses of different polarity, decreasing in amplitude. The duration of the current pulse is constant, the amplitude of the pulse is much longer than the duration

five

0

tj of each of the series of decreasing pulses (fig ,, 3). The beginnings of the passage of current pulses coincide, and by the end of the current pulse of constant amplitude, the amplitude of a series of different polarity pulses decreases to zero.

After the magnetization is finished, the output signal of the fluxgate gradiometer 2. is fed to the input of the selective amplifier 3, where its second harmonic is allocated proportional to the magnitude of the normal component of the field of residual magnetization of the material, then to the input of the synchronous detector 4 "Detected signal is fed to the input of the integrator 5, which compares the output signal of the synchronous detector 4 with a zero level and at the output of which the error signal is formed. This signal is fed by the ID:; identical counter-activated coils 7, which create a magnetic field gradient, directed opposite to the field of the residual magnetization of the mat; rial. In this case, indicator 6 measures the current through identical coils - 7, which is proportional to the final value of the gradient of the normal strength of the field of residual magnetization, according to which, on the basis of the previously studied coupling, w / 1, in magnetic and fur :; The material properties judge the quality of the controlled product.

The use of the second element 12; source 11 -dipole pulses. Thus, the generator 10 sync pulses allows, by passing through both magnetizing solenoids, syncronized pulses of a given shape, affect the magnetization process of the controlled material and ensure high stability of the residual field strength HaMarHH4eH.HocTj, which is -) - Pulse magnetic analyzer with information parameter control.

0

five

five

Claims (1)

Formula of gain Pulsed magnetic analyzer according to author No. 998934, distinguishing with the fact that, in order to increase the reliability of the analysis, it is equipped with series-connected generator of sync pulses, a source of a non-magnetizing element, made in the form of a solenoid and located concentrically with the first magnetizing It is controlled and connected to the second output of the clock generator. t; and, 2 FIG. 2 Editor I. Derbak Compiled by I. Rekunova Tehred I. Veres Proofreader p. Cherni Order 2121/39 Circulation 778 Subscription VNIIPI State USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Fig.Z