SU1580243A1 - Reproduction apparatus for magnetic tape testing - Google Patents

Abstract

The invention relates to instrumentation, relates to the magnetic method of flaw detection and can be used to control the quality of ferromagnetic materials. The aim of the invention is to increase the reliability and sensitivity when reproducing the magnetograms by reducing the noise level and increasing the level of the signal removed from the magnetogram. To achieve the goal, the reproducing magnetic heads 2, 3 are installed diametrically opposite around the perimeter of the drum 1 and are electrically interconnected, in the vicinity of the rotating drum 1 a fixed-flow sensing sensor 4 is installed, made in the form of a magnetic circuit with a winding. The magnetic circuit is made in the form of an arc with a radius of curvature corresponding to the curvature of the drum 1. 1 Cp f-ly, 2 ill.

Description

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The invention relates to instrumentation, relates to the magnetic method of flaw detection and can be used to control the quality of ferromagnetic products.

The aim of the invention is to improve the reliability of information retrieval, sensitivity when playing magnetograms by reducing the noise level and increasing the level of the clear signal from the magnetogram and increasing the resolution.

1, scans the recorded magnetic tape, which arises in the winding of the magnetic head 2, the signal enters the winding of the magnetic head 3, which creates a magnetic field with a flux of 4 in the magnetic core proportional to the magnetic flux of the magnetic tape being scanned. This field is read by a fixed flow sensitive sensor 4.

When the drum 1 rotates half a turn, the functions of the induction magnetic heads change: the head 3 scans

1a of FIG. 1 shows a structural circuit., A magnetic tape and reads behind it - -., -, written information, and a magnetic head 2, the winding of which is electrically connected with the winding of the head 3, creates a magnetic field that is read by a fixed flow sensitive sensor 4.

ma device, general view; in fig. 2 is a device diagram for transmitting a signal read from a tape recorder.

The device includes a drum 1 mounted for rotation around its axis, two reproducing magnetic heads 2 and 3 fixed at a predetermined distance around the drum perimeter; the windings of which are connected in parallel, the flow sensitive sensor 4 made in the form of a core 5 bent along arc of a circle concentric to the drum and winding b placed on the core 5, connected to the measuring unit 7, which includes a series-connected amplifier 8 and indicator 9, and a mechanism 10 for moving the magnetic carrier 11, and It is read from the magnetic carrier 11 and the flow sensitive sensor 4 located relative to the drum at the same radial angle as the reading magnetic heads 2 and 3.

The device works as follows.

When the drum rotates V, the magnetic head 2, which is an induction one, scans the magnetic medium 11, on which there is a fixed field recording. The relief of the magnetic field of the magnetic carrier 11 carries information about the quality of the part being tested. When the magnetic head 2 moves relative to the carrier 11 in accordance with the law of magnetic induction, an emf is generated in the head 2, depending on the rate of change of the magnetic flux of the magnetic carrier:

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In this case, the core 5 of the flow-sensitive sensor 4 has a working part of at least the width of the scanned magnetic tape and curved along an arc of a circle, concentric drum - 1, in which the induction magnetic heads 2 and 3 are installed. reading the magnetic flux field created by the head 3, and hence the floor of the investigated magnetic tape. The signal from sensor 4 is then fed through amplifier 8 to indicator 9 of the flaw detector. The use of a flow-sensitive sensor 4 gives the true shape of the magnetic relief of the surface of the product recorded on magnetic media.

Claims (2)

1. A reproducing apparatus for magnethographic defectoscopy, comprising a drum mounted rotatably around its axis, a reproducing magnetic head fixed thereto, a measuring unit and a mechanism for moving the magnetic carrier relative to the drum, so as to increase the reliability of the pickup information and sensitivity, it is equipped with a second magnetic head installed at a given distance from the first perimeter of the drum, and the winding of the second magnetic head is connected parallel Flax winding first magnetЈ, U) AF (about dt The moment the induction magnetic head 2 rotates in the drum five 0 five 0 five 0 five In this case, the core 5 of the flow-sensitive sensor 4 has a working part of at least the width of the scanned magnetic tape and curved along an arc of a circle, concentric drum - 1, in which the induction magnetic heads 2 and 3 are installed. reading the magnetic flux field created by the head 3, and hence the floor of the investigated magnetic tape. The signal from sensor 4 is then fed through amplifier 8 to indicator 9 of the flaw detector. The use of a flow-sensitive sensor 4 gives the true shape of the magnetic relief of the surface of the product recorded on magnetic media. Invention Formula 1. A reproducing apparatus for magnethographic defectoscopy, comprising a drum mounted rotatably around its axis, a reproducing magnetic head fixed thereto, a measuring unit and a mechanism for moving the magnetic carrier relative to the drum, so as to increase the reliability of the pickup information and sensitivity, it is equipped with a second magnetic head installed at a given distance from the first perimeter of the drum, and the winding of the second magnetic head is connected parallel Flax winding of the first magnetic head and a flow-sensitive sensor mounted stationary near the drum and connected to the measurement unit, and the reading area from the magnetic carrier and the tray-sensitive sensor are located relative to the drum at the same radial angle as the reading magnetic heads.  L fc fc Y, K ft Ъ I .  i'm 7 7 2. The device according to claim 1, characterized in that | In order to increase the resolution of the flaw detector, the flow-sensitive sensor is made in the form of a core bent along an arc of a circle concentric to the drum and placed on the core of a winding connected to the measuring unit. / 77 F / eight FIG. 2