SU1439484A1 - Eddy-current device for nondestructive quality inspection - Google Patents

Abstract

The invention relates to non-destructive testing of materials and products and can be used in industry for the flaw detection of the surface of electrically conductive objects,. The purpose of the invention is to increase the reliability of control by eliminating uncontrolled zones between converters. When the product surface is scanned by the multi-element transducer 1 due to periodic pulses coming from the generator 7 of the synchronization pulses i of the recording, sequential recording of the information signal is performed. Nala in block 4 memory. In this case, the signals from the first line of elementary converters are written into the even addresses of the block 4 memory, and the signals from the second line into the odd ones. Since the elementary transducers are placed in rows with a shift, the entire surface of the product is scanned. One is temporarily read sequentially. cells of the memory block 4 and information from them is presented on the screen in the form of a light pattern. 1 z.p, f-ly, 4 ill. S cl

Description

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The invention relates to the non-control of materials and products using the method of eddy currents and can be used in industry for testing surface of electrically-conducting objects.

The purpose of the invention is to increase the reliability of control due to the elimination of uncontrolled zones between transformers.

Figure 1 shows the structural XEM of the eddy current device; on 1IG.2 - placement of converters; and FIG. 3 shows the construction of a write synchronization pulse generator; on ig.4 - a disk converter.

The device holds a serially connected multi-element transducer 1, an amplitude-time selection unit 2, an analog-to-digital converter 3, a memory block 4, a digital-to-analog converter 5, and a video monitoring unit 6. The device also includes connected synchronizer pulse generator 7 records, a synchronous generator 8, the synchronization outputs of which are connected to block 2 of amplitude and time selection, block 4 of memory 1 and a analogue converter 5, and the input is connected to the output of analog Converter 3, and block 1 sweep, the output of which is connected to |, is connected to the multi-element converter 1 ,. I The single element transducer 1 is made in the form of two lines 10 and 11 (fig. 2) of elementary transducers 12, shifted relative to each other iHa half the distance between the elemental: transducers 12 in the line. The shaper 7 of the synchronization pulses contains a record (fig. 3) case 13, in which two disks 14 and 15 are fixed with the possibility of rotation, with red rims 16, so that their rotation axis 17 is parcel to line 11 of elementary converters 12. Disk 14 is made opaque with slits. 18, the distance between them is equal to the distance between lines 11 and 12,

Also, the driver 7, the synchronization pulses contains a 19 K LED photodiode 20, located in the housing 13 on opposite sides of the disk 14 at the level of 18 words 18, and a compiler 21,

about 0 0 5 O

five

the photodiode is connected to the input, 20, and the output is the output of the imaging device 7.

The device works as follows.

Multi-element converter 1 converts the distribution of the magnetic fields of the control object (not shown) into an information signal an. The amplitude and time selection unit 2 selects the signal from the interference voltage, the analogue of the cd-digital. The converter 3 converts the signal into a digital code, which is stored in the memory block 4. The synchronous generator 8 sequentially polls the cells of the memory block 4 and information from them is fed to the digital-to-analog converter 5, converted into analog form, and then displayed on the screen of the control disk 6 as a luminance distribution.

To obtain information on the length of the entire line 10, the scanner sequentially switches the elementary conversions of 12 in a row. Simultaneously moving; element transducer 1 on the surface of the test object. At the same time, due to the rotation of the disks 14 and 15, the photodiode 20 is periodically illuminated through the slots 18 by the LED 19. The received pulses go to the synchronous generator 8, where the pulses are formed by lines 10 and 11 so that the signals from line 10 are recorded in the even cells of memory block 4 and the signals from line 11 are odd j, which allows scanning the entire surface of the test item.

Claims (1)

1. An eddy current control device for non-destructive testing, containing a synchronous generator connected in series, a scanner unit, a multi-element converter made in the form of a matrix of elementary converters, and an amplitude and time selection unit, the second input of which is connected to the synchro generator, and a video monitoring unit characterized by the fact that, in order to increase the reliability of the control, it is equipped with P1 forms for the synchronization pulses of the recording, connected to the synchronizer, and Odd DDD i6 Fi $ .3 Editor C, Patrusheva Compiled by Yu.Glazkov Tehred M. Didyk Proofreader S. Shekmar. Order 6070/43 Circulation 847 VNIIPI USSR State Committee on inventions and postcards 113035, Moscow, Zh-35, Raushsk nab., 4/5 Fi8.2 Z (. Subscription