SU1672347A1 - Magnetosensitive assembly to magnetic - field video flaw detector - Google Patents

Abstract

The invention relates to non-destructive testing of materials and can be used in analyzing the quality of products according to the distribution of magnetic fields. The aim of the invention is to increase the reliability of operation by simplifying the structures of the magnetically sensitive node and the scanner unit. When testing products, the ferrite core line transforms the distribution of magnetic fields into an electrical signal, which is displayed on the screen of a video monitoring unit in the form of a two-dimensional brightness pattern. For sequential polling of ferrite cores, the binary code generated by / M + 1 / = by bit counter 16 goes to ferrite cores 1 corresponding to this code. Moreover, due to the fact that the number of turns of each excitation wire 2 is different on each ferrite core, only one ferrite core at each cycle of operation. 2 Il.

Description

The invention relates to non-destructive testing of materials and can be used in analyzing the quality of products according to the distribution of magnetic fields.

The purpose of the invention is to increase the reliability of operation by simplifying the structures of the magnetically sensitive node and the scanner unit.

Fig. 1 shows the block diagram of the device; Fig. 2 shows the construction of the scanner unit.

The magnetically sensitive node contains ferrite cores 1.1 - 1.1c located in a ruler, wires 2.T - 2.t excitement, penetrating according to the binary code corresponding ferrite cores 1.1-1-1.K corresponding to

the number of turns, the control wire 3. the output winding 4 and the scanner unit 5, to the outputs of which the excitation wires 2.1-2t are connected and the control drive 3

Figure 1 also shows a magneto-television flaw detector containing a series-connected differential amplifier 6 connected to the output winding 4, a detector 7, an amplitude selector 8, an analog-to-digital converter 9, a memory unit 10, a digital-analog converter 11 and a video monitoring unit 12, and the synchronous generator 13, whose outputs are connected to the unit 5 times by winding, memory block 10 and digital-to-analog converter 11.

ABOUT

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Scanning unit 5 contains AND-NOT 14 elements connected in series, an inverter 15. (t + 1) -disable counter 16. and delay element 17, the output of which is connected to the Reset input (t + 1} -disable counter, (t + 1) key 17.1-17 (t + 1) current, connected to the corresponding outputs (t + 1) -disable meter and (t + 1) variable resistor 18.1-18 (t + 1), connected respectively to the outputs of the keys 17.1- 17 (pl + 1) current.

The device works as follows.

Ferrite cores are placed on the surface of a controlled product (not shown) and their surface is scanned sequentially. In this case, the signal from the output winding 9 is amplified by the differential amplifier 6, detected by the detector 7 and filtered from the noise by an amplitude selector. Then, after being converted by an analog-to-digital converter 9 into a digital form, is stored in the memory block 10. After accumulating the full frame, the signal from the memory block 10 through the digital-to-analog converter 11 is fed to the video control block 12.

To ensure a consistent polling of the ferrite cores 1, clock signals from the synchronous generator 13 are fed to the inverter 14 and through the inverter 15 to the input of (t + 1) -disable counter 16. At the output of the counter a binary code is formed, which through the switches 7 of the current and resistors 18 is fed excitation wires 2. Since the total number of turns on each of the cores 1 is the same, the magnitude of their magnetization is also the same, and the choice of a particular magnetized ferrite core 1 is made by the incoming

code due to the individual for each ferrite core 1, a combination of excitation wires 2 and the number of turns for each excitation wire 2.

Claims (1)

Invention Formula A magnetically sensitive node to a magnetic television flaw detector, containing a line of ferrite cores, a control wire and an output winding, penetrating all cores, field wires and a scanner, characterized in that, in order to increase reliability of operation, the scanner is made in the form of series-connected NAND element whose inputs are the scanner inputs, the inverter (t + 1) - bit counter and delay element, the output of which is connected to the Reset input (t + 1) - bit counter, (t + 1) current keys connected to the respective outputs of the (t + 1) -discharge counter and (t + 1) variable resistors, m of which are connected between the outputs of the corresponding current switches and the excitation wires, The (t + 1) th variable resistor is connected between the (t + 1) th current key and the control wire, the excitation wires penetrate the corresponding ferrite cores according to the m-bit binary code, The number of turns of the low-voltage excitation drive for a ferrite core is n / 2, the total number of turns of excitation wires on each ferrite core is 2n, and the output winding penetrates the ferrite cores so that the number of core-turns of individual excitation wires in one direction is the number of core turns of the excitation wires in opposite direction.