SU926596A1

SU926596A1 - Ultrasonic flaw detector

Info

Publication number: SU926596A1
Application number: SU802977865A
Authority: SU
Inventors: Анатолий Иванович Лунин; Нина Николаевна Локшина; Валерий Алексеевич Архипов; Сергей Николаевич Уханов
Original assignee: Научно-производственное объединение "ЭНЕРГИЯ"
Priority date: 1980-08-22
Filing date: 1980-08-22
Publication date: 1982-05-07

Description

(5) УЛЬТРАЗВУКОВОЙ ДЕФЕКТОСКОП(5) ULTRASOUND DEFECT TESTS

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Изобретение относитс к неразру шающим испытани м ультразвуковым методом и может быть использовано в металлообрабатывающей и машиностроительной промышленности.This invention relates to non-destructive ultrasonic testing and can be used in the metalworking and engineering industries.

Известен ультразвуковой дефектоскоп , содержащий генератор импульсов, преобразователь, ограничитель импульсов ,усилитель и индикатор 11.Known ultrasonic flaw detector containing a pulse generator, transducer, pulse limiter, amplifier and indicator 11.

Наиболее близкий к предлагаемому по технической сущности и достигаемому peзyльtaтy ультразвуковой дефектоскоп содержит последовательно соединенные генератор импульсов, преобразователь , резистор, ограничитель импульсов , состо щий из двух диодов, соединенных встречно-параллельно, усилитель и индикатор 2.The ultrasonic flaw detector closest to that proposed by the technical essence and the attained efficiency contains a pulse generator connected in series, a converter, a resistor, a pulse limiter consisting of two diodes connected antiparallel, an amplifier and an indicator 2.

Недостатком известных устройств вл етс низка чувствительность, так как подавление зондирующего импульса происходит не полностью.A disadvantage of the known devices is low sensitivity, since the suppression of the probe pulse does not occur completely.

Цель изобретени - повышение чувств .ительности дефектоскопа.The purpose of the invention is to increase the sensitivity of the flaw detector.

i Поставленна цель достигаетс тем,что ультразвуковой дефектоскоп, содержащий последовательно соединенные генератор импульсов, преобразователь , резистор, ограничитель импульсов , усилитель и индикатор, снабжен усилителем тока, включенным между генератором импульсов и ограничителем импульсов, линией задержки, включенной между генератором импуль10 сов и преобразователем, а ограничитель импульсов выполнен в виде трансформатора и электронного ключа, состо щего из двух транзисторов,включенных инверсно, перва обмотка тран1$ сформатора подключена к резистору, втора обмотка - к входу усилител , а треть - к электронному Ключу.i The goal is achieved by the fact that an ultrasonic flaw detector containing a series-connected pulse generator, transducer, resistor, pulse limiter, amplifier, and indicator is equipped with a current amplifier connected between the pulse generator and the pulse limiter, a delay line connected between the pulse generator and the converter, and the pulse limiter is made in the form of a transformer and an electronic key consisting of two transistors connected inversely, the first winding of the transistor ora is connected to the resistor, the second winding - to the input of the amplifier, and a third - to the dongle.

На фиг.1 представлена блок-схема дефектоскопа;на фиг. 2 - временные FIG. 1 is a block diagram of a flaw detector; FIG. 2 - temporary

20 эпюры, по сн ющие работу схемы.20 plots explaining the operation of the scheme.

Claims

The ultrasonic flaw detector contains a series-connected pulse generator 1, a transducer 2, a resistor 3, a limiter k of pulses, an amplifier 5 and an indicator 6, a 7-current amplifier connected between the pulse generator and a limiter of k pulses, and a delay line 8 connected between the pulse generator 1 and the converter

2. The limiter of C pulses is made in the form of a transformer 9 and an electronic switch 10, consisting of two transistors 11 and 12, switched inversely. flaw detector operation em as follows. From the output of the pulse generator 1, 13 (Fig. 2), in the form of square pulses, is supplied to the amplifier 7, the TOKZ. The signals from the output of the amplifier 7 unlock the electronic key 10. The winding 8 of the transformer 9 turns out to be short-circuited through the series-connected transistors 11 and 12. Simultaneously from the output of the pulse generator 1, a probe pulse 1 with a time delay is supplied from the converter 2 I and the winding A transformer 9 through a resistor

3. Since the winding B is closed through the public key 10, the probe pulse is completely suppressed. On the winding B, the signal is practically absent. After the end of the generator 1, the key 10 is locked, representing a large resistance in the winding circuit B. In this period until the next driving pulse, the output signal from the converter 2 is fed through the resistor 3 to the winding /, the converter 2 operates in the excitation mode and receiving an echo pulse of ultrasonic vibrations in a controlled object, reflected from a defect or the back wall of the product. At the same time, amplitude-amplified echo pulse 15 enters the input of amplifier 5 and further to indicator 6. At the same time, this signal is increased due to the large number of turns of winding B compared to winding A. Thus, the invention improves the sensitivity of the flaw detector by almost complete suppression of the probe pulse. Ultrasonic flaw detector containing in series (coupled - pulse generator, transducer, resistor, pulse limiter, amplifier and indicator, characterized in that, in order to increase sensitivity, it is equipped with a current amplifier connected between the pulse generator and the pulse limiter delay connected between the pulse generator and the converter, and the pulse limiter is made in the form of a transformer and an electronic key, consisting of two transistors, included It is not certain that the first winding of the transformer is connected to a resistor, the second winding is connected to the input of the amplifier, and a third is connected to the electronic key, Sources of information taken into account during the examination 1. Flaw detector, 197, No. 3, .116-118. 2, Flaw detector 197, f 1,. 89-96 (prototype).