SU907483A1 - Matrix converter of magnetic fields - Google Patents

Description

I

The invention relates to instrumentation technology and can be used to control the quality of the structure of ferromagnetic materials and products based on the results of their interaction with magnetic fields.

A device containing a magnetically sensitive node, made in the form of a matrix of Hall elements, unicon, a video monitoring device 1.

A disadvantage of this device is its low reliability and considerable size.

The closest to the invention to the technical essence is a magnetic field transducer containing a magnetically sensitive node made in the form of a matrix of sensitive elements, the output of which is connected to a video monitoring unit, a scanner unit, the output of which is connected to the control inputs of the magnetic sensitive node and video monitoring unit 2.

The disadvantages of the transducer are low sensitivity and limited sensitivity of the Hall elements.

The purpose of the invention is to increase the sensitivity of the transducer.

The goal is achieved by the fact that the matrix converter of magnetic fields, containing a magnetically sensitive node, made in the form of a matrix of magnetic elements, connected with the help of address buses in groups and rows,

The scan ts, the output of which is connected to the input of the magnetically sensitive node and with the first input of the video monitoring unit, is provided with an amplitude selector, and the magnetically sensitive

Claims (2)

20, the elements are made in the form of galvano-magneto-magnetic converters, in parallel with which the storage capacitors are connected, and the output of the magnetically sensitive node is connected via an amplitude selector to the second input of the video monitoring unit. FIG. 1 is a block diagram of a converter; in fig. 2 - constructive execution of the magnetically sensitive node. The device consists of a magnetically sensitive unit 1, a unit 2 times a span, an amplitude selector 3 “whose output is connected to a video monitor k. The magnet assembly has address spikes, the role of which is carried out by conductive strips 5 and 6, galvano-magneto-magnetic transducers 7, in parallel with which are included storage capacitors 8, diodes 9 The converter operates as follows. The control object creating an inhomogeneous magnetic field B is located near the magnetically sensitive node 1. Under the influence of the magnetic field, a change occurs in the resistance of the galvano-magnetically-combinational converters 7- These converters have a linear output characteristic in weak magnetic fields and are more sensitive than the Hall converters. As a result of the action of a magnetic field, an electric potential relief is formed on the surface of the matrix of magnetically sensitive elements, corresponding to the intensity of the field. In the device, the principle of accumulation is used to increase sensitivity. At the same time, the magnitude of the current of the video signal coming from each low-sensitivity element is proportional to the total magnetic flux acting on the element for the entire period between commutations, i.e. over timeframe Each capacitor 8 (Fig. 2) (switching converter 7) is charged to the maximum voltage at the time of switching and gradually discharges between the switches to a voltage depending on the magnetic field strength on this converter 7. The magnetically sensitive node contains two electrodes, made in the form of conductive strips 5 and 6 insulated from each other, perpendicular to each other. In the process of analyzing the electropotential 9 34 relief, they perform the functions of address buses, to which horizontal and human impulses are received from block 2 sweeps. Galvanomagnetically. the transducers 7 are connected in series with the diodes 9. acting as keys. The key closure (diode 9) occurs when the line and frame pulses from the unit 2 sweeps coincide. Therefore, at any given time, only the matrix converter is connected to the load. With the sequential switching of all elements of the matrix, elementwise scaling of its electric potential relief occurs. When synchronously playing the signals of the magnetically sensitive Node 1 on the video monitoring screen. unit 4, using the unit 2 sweeps, an image of the magnetic relief corresponding to the structure of the object under test is obtained. The use of a matrix transducer of magnetic fields makes it possible to increase the sensitivity several times in comparison with the known and to extend the range of measured magnetic fields. The matrix matrix of magnetic fields, containing a magnetically sensitive node, made in the form of a matrix of magnetically sensitive elements connected with address buses in groups and rows, a scanner unit, the output of which is connected to the input of the magnetosensitive node and the first input of the video monitoring unit, characterized in that in order to increase the sensitivity of the converter, it is equipped with an amplitude selector, and the magnetically sensitive elements are made in the form of galvano-magnetic converters, in parallel with which the storage capacitors are connected, while the output of the magnetically sensitive node is connected via an amplitude selector to the second input of the video monitoring unit. Sources of information taken into account in the examination 1. The author's certificate of the USSR If 616860, class G 01 R 33/06, 1978. 2. USSR author's certificate for application number 2712176, cl. G 01 R 33/06, 2.01.80. Phie.1