SU1037156A2 - Matrix-type magnetic field converter for structuroscope - Google Patents

Abstract

MATRIX CONVERTER MAGNETIC FIELDS TO STRUCTURE ON AUTH. St. 974239, about tl and h ayushch and with the fact that, for the purpose of increase in accuracy of control, T-1-shaped and / or disk applications are executed on a magnetic film.

Description

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b: The invention relates to the control of ferromagnetic materials by physical methods and can be used for flaw detection of ferromagnetic materials and products. According to the main author. St. No. 974239 is known a matrix converter of magnetic fields to a structure microscope, containing a matrix made in the form of a magnetic film with cylindrical magnetic domains, associated with a scanner and a video monitor 13.. However, such a converter has insufficient control accuracy, since the magnetically sensitive unit is made in the form of current-carrying conductors in contact with a magnetic film. The purpose of the invention is to improve the control accuracy. This goal is achieved by the fact that T-1-shaped and / or disk applications are made on the magnetic film. Fig, 1 shows the block diagrams of the proposed Converter; in fig. 2 - constructive implementation of the magnetically sensitive node; FIG. 3 shows the information channel, made in the form of per-Malloy disk applications. They show control object 1, magnetically sensitive NII. Node 2, block 3 sweeps, amplitude {selector 4, video monitor 5, block b of impulse generators, accumulation, storage, transfer of information, information channels 10, T- 1-shaped ferromagnetic applications 11, Helmholtz coils 12 and 13, galvanomagnetic sensor 14, amplifier 15, output 16 of which is connected to the amplitude selector, disk applications 17. The converter works as follows. The control object 1, which creates a non-uniform magnetic field (FIG. 1), is located near the magnetically sensitive node 2, which is made on a homogeneous magnetic medium, as which can be used films of orthoferrite or epitaxial garnet films. The magnetically sensitive node 2 is a matrix planar transducer of the magnetic relief of a parallel-frame structure (Fig. 2). It consists of three sections 7-9, accumulation of information, storage of information, transfer of information. On the side of the magnetic film facing the substrate, information channels 10 are created to move the cylindrical magnetic domains, which are made by depositing ferromagnetic T-1-shaped applications on the surface of the magnetic film, the name of which is determined by their geometry. The advantage of domain promotion schemes for T-1-shaped applications is the lack of electrical contact with the control magnetic field created by the Helmholtz coils 12-13, the optimum magnetization mode of the ferromagnetic applications, which increases the accuracy of control, ease of manufacture. The principle of the advancement schemes on (T-1) structures is based on the interaction of a domain that is similar to a magnetic dipole with magnetic fields created by magnetic charges induced by the rotating magnetic field of the Helmholtz coil in (T-1) applications. The rotation of the control field leads to a periodic redistribution of the poles of the magnetic charges in the applications, which causes the domains to move. The speed of rotation of the magnetic field vector, which determines the speed of movement of the lindrical magnetic domains, is set using the sweep unit 3 by supplying the appropriate voltage alternating field p; from the block 6 of the pulse generator to the inputs of the Helmholtz coils 12 and 13, the registration of cylindrical magnetic domains at the output of the transfer section 9 is carried out using a galvanomagnetic sensor 14, which can be used as Hall, magnetoresistor, magnetic LED sensors. The magnetic field of object 1 of control causes the appearance in their respective places of the matrix of cylindrical magnetic domains the density of magnetic charges of which corresponds to the magnetic relief of object 1 of control. These domains are located under the corresponding elementary cells of the matrix, formed by rows (T-1) of applications. After the end of one frame, alternating polarity pulses arrive at the coils 12 and 13 of Helmholtz’s signal from the pulse generator unit B and accumulated in the accumulation section 7 during one frame, the cylindrical magnetic domains shift rapidly under the action of the control magnetic field to the storage section 8, and the accumulation section 7 is prepared for receiving the magnetic image of the next Frame. During the formation of the next frame, the information from the storage section 8 is transferred line by line to the transfer section 9, from where it is elementwise using a control magnetic field created by the Helmholtz coil 13 and fed to a galvanomagnetic 14, the video signal amplitude of which is proportional to the charge density of the corresponding domain.

The video signal from the output of the sensor 14 is fed through the amplifier 15 and the amplitude selector 4 to the input of the video monitor device 5, on the screen of which, using the scanner unit 3, the beam is synchronized, the brightness of the spotlight is adjusted using the amplitude selector 4. Investigator However, the optical image on the screen of the video monitoring device 5 will correspond to the magnetic relief of the object 1 of the control and characterize its structure.

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Information channels It is possible to manufacture in the form of Disk applications 17 (Fig. 3), along the perimeter of which the domains are moved when the application of a rotating magnetic field created by knives 1 and 13 Helm-. char. one -

The use of a matrix magnetic field converter will improve the accuracy of controlling ferromagnetic objects by a factor of 1.5–2 due to the optimal accumulation mode of ferromagnetic applications, and simplify the design of the converter.

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FIG. 2

Claims (1)

MATRIX TRANSFORMER OF MAGNETIC FIELDS TO STRUCTUROSCOPE according to ed. St. № 974,239 of m and n and Yusch hours and minutes with the I that for the purpose of ^higher: Nia control accuracy, a magnetic film made of T-1-type and / or disk applications.