SU1557513A1 - Device for calibrating flaw detectors - Google Patents

Abstract

This invention relates to a measurement technique and can be used to calibrate flaw detectors. The purpose of the invention is to expand the field of application by calibrating also flaw detectors with pass-through transducers and to increase the information content by using a removable dielectric element located in the gap of the ring-shaped element with artificial defects. The drive rollers drive the indicated elements into rotation, and an element with artificial defects, passing through the pass-through or invoice converter, periodically generates pulses from the beginning and end of the defect of this element at the output of the converter, which is equivalent to receiving similar signals on the tested product. Adjusting the speed of rotation of the rollers simulates a change in the speed of movement of the element with artificial defects relative to the flaw detector transducer. 1 hp f-ly, 1 ill.

Description

This invention relates to a measurement technique and is intended to set up and calibrate flaw detectors.

The purpose of the invention is to expand the field of application by calibrating also flaw detectors with pass-through transducers and increasing the information content due to the possibility of simulating also the beginning and end of the product.

The drawing shows a diagram of a device for calibrating flaw detectors with pass-through and overhead converters,

The device contains a ring-shaped element imitating a test item 1 installed with the possibility of rotation around its axis, with artificial defects 2 and 3 of different types located along its perimeter, and a removable dielectric element 4, the cross section area and shape, and the radius of curvature equal to the corresponding parameters of element 1 , the latter is open, and the dielectric element 2 is installed in its gap.

The device also contains evenly spaced around the perimeter of the ESL SP

SP

with

1 with artificial defects and three drive rollers 5 connected to it, each of which is made with a groove 6 on the side surface of which corresponds to the shape of the surface of element 1 that is associated with it.

The drawing also shows the bill of lading 7 and the pass-through 8 converters 7 and 8 of flaw detectors. Defects 2 and 3 are minimal.

A device for calibrating flaw detectors works as follows. The drive rollers 5 rotate element 1 with artificial defects 2 and 3 together with element 4 of dielectric material around the axis. The grooves 6 of the rollers 5 prevent the element 1 with defects 2 and 3 from slipping off relative to the rotating rollers 5, and thereby keep the element 1 in the same plane of rotation. Element 1 with defects 2 and 3, passage through converter 7 or 8 of a flaw detector, periodically generates pulses from the beginning and end on its output, as well as calibrated pulses from minimal artificial defects 2 and 3, which is equivalent to receiving pulses at the output of converter 7 or 8 of a flaw detector from the beginning, end and defects of long products.

To calibrate flaw detectors with various sizes of transducers 7, 8, including flow transducers, as well as flaw detectors for checking products of various profiles, element 4 is separated from element 1 and the necessary transducer 7, 8 is installed.

Calibration of flaw detectors using element 1 with minimal artificial defects 2 and 3 is performed when performing such verification procedures of flaw detectors as determining the health of threshold circuits, determining the output signal level of measurement information, determining the instability of flaw detector penalties.

For separate calibration of various flaw detector channels depending only on one of the types

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five

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five

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five

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defects, for example, incomplete welding of the weld, compression of metals during welding, etc., element 1 is used with one of the types of defects corresponding to the calibrated channel of the flaw detector.

Having a set of different elements 1 with the necessary combinations of artificial defects of various types, it is possible to rebuild the defectoscope from the harmful effects of interfering factors, in particular from the harmful effects on other channels of the defectoscope of other types of defects to which the channel to be calibrated should not respond.

By adjusting the speed of rotation of the rollers 5, a change in the speed of movement of long products relative to the transducer 7 or 8 of the flaw detector is simulated.

Claims (2)

1. A device for calibrating flaw detectors containing an annularly imitating monitored product under test which rotates around its axis, with artificial defects located along its perimeter, characterized in that, in order to expand the field of application by calibrating also flaw detectors with pass-through converters and to increase the information content, it is equipped with a removable dielectric element, the area and shape of the section, and the radius of curvature of which is equal to the corresponding parameters of the element NTA with artificial defects, the latter is open, and the dielectric element is installed in its gap. 2. The device according to claim 1, characterized in that, in order to increase the calibration accuracy, it is provided with a uniformly placed around the perimeter of the element with artificial defects and three drive rollers mated to it, each of which is made with a groove on the side surface, the shape of which corresponds to the shape of the element surface mating with artificial defects. eight S -S3