SU932395A1 - Ultrasonic shadow immersion flaw detector - Google Patents

Description

The invention relates to non-destructive testing by the ultrasonic method and can be used for. control products in the metallurgical; machine-building and other industries.

A known ultrasonic shadow immersion flaw detector containing a synchronizer, emitting and receiving transducers, an amplitude-time selector, a pulse shaper and a recorder (1).

A disadvantage of the known device is the low reliability of control.

The closest to the proposed technical essence and the achieved result is an ultrasonic shadow immersion flaw detector containing a series-connected probe pulse generator and a Radiating transducer, a receiving transducer and an amplifier, two amplitude-time discriminators, the first inputs of which are connected to the output of the amplifier, and the second inputs to the output a probe pulse generator, and a recorder [2].

A disadvantage of the known flaw detector is the low reliability of the control, since due to the disappearance of the η transmitted pulse, false registration of the defect occurs.

The purpose of the invention is to increase the reliability of control.

This goal is achieved in that the ultrasonic flaw detector is equipped with a first trigger connected in series, two inputs of which are connected to the outputs of amplitude-time discriminators, a differentiating circuit, an OR circuit, a second trigger, the output of which is connected to the recorder input, a third amplitude-time discriminator, the first input of which connected to the output of the amplifier, the second input to the output of the probe pulse generator, and a third trigger connected between the third amplitude-time discriminator and OR circuit.

The drawing shows a block diagram of an ultrasonic flaw detector.

An ultrasonic shadow immersion flaw detector contains a series-connected generator of 1-zone, conducting pulses, an emitting transducer 2, a receiving transducer 3 and an amplifier 4, amplitude-time discriminators 5 and 6, the first 30 inputs of which are connected to the output of amplifier 4, and the second inputs to the output of generator 1 probe pulses, and a recorder 7. In addition, the flaw detector contains a first trigger 8, 5 connected in series, two inputs of which are connected to the outputs of the amplitude-time discriminators 5 and 6, differential the circuit 9, the OR circuit 10, the second trigger 11, the output of which is connected to the input 10 of the recorder 7, the third amplitude-time discriminator 12, the first input of which is connected to the output of the amplifier 4, the second input - with the output of the generator 1 of probing 15 pulses, and a third trigger 13 connected between the third amplitude-time discriminator 12 and the OR circuit 10.

The flaw detector operates as follows 20.

From the output of the generator 1, the probe pulses are transmitted to the emitting transducer 2. If the controlled product is present, 25 and there is no defect, the receiving transducer 3 receives the transmitted pulses and then they go to the amplifier 4. The time-amplitude discriminators 5 and b are set to preset sensitivity level, which select the nth and nth pulses necessary for further processing, and in the absence of a defect, provide the necessary information in the form of rectangular pulses ”to the inputs of trigger 8. Trigger ·, 8 forms a pulse, the leading edge of which coincides with the arrival time of the ηth, and the trailing edge of the nth arriving pulse. Through differentiating circuit 40, circuit 9 and circuit OR 10, this pulse triggers trigger 11 with its trailing edge. The presence of a rectangular edge at its output prohibits the recording of a defect on recorder 7. Before 45 at the beginning of each clock cycle, trigger 11 is reset.

If there is a defect in the product under test for at least one of the 5Q transmitted pulses (η or gp-mu), a rectangular pulse will not form at the output of the corresponding discriminator 5 or 6 (the presence of a defect in at least one of the past 55 pulses means that defect weakened the amplitude of the donor pulse in such a way that its value turned out to be less than the specified sensitivity threshold).

Therefore, trigger 8 also does not work, which means that there is no pulse at the output of trigger 11. The registrar 7 fixes a defect in the product.

In the absence of a controlled product, the amplitude of the transmitted pulse is large, which leads to the operation of the amplitude-time discriminator 12. The pulse from the output of the amplitude-time discriminator 12 triggers the trigger 13. The pulse s, the output of the trigger 13 through the circuit OR 10 triggers the trigger 11. The presence on it the output of the square difference prohibits the recording of the defect on the recorder 7.

The proposed flaw detector can improve the reliability of control, since the absence of a controlled product does not lead to false registration of the defect.

Claims (2)

The invention relates to non-destructive ultrasonic testing and can be used to control products in the metallurgical engineering and other industries. Known ultrasonic shadow immersion flaw detector containing a synchronizer, emitting and receiving transducers, the amplitude selector selector, pulse shaper and the recorder 1. A disadvantage of the known device is low reliability of the control. The closest to the proposed technical entity and the achieved result is an ultrasonic shadow immersion flaw detector containing a series-connected probe pulse generator and a transmitter emitting transducer receiving transducer and an amplifier two axial-time dixerminators, the first inputs of which are connected to the output of the amplifier, and the second inputs with output probe pulse generator, and the recorder 2. The disadvantage of the known flaw detector is low, the reliability of the control, so to As a result of the disappearance of the last pulse, false detection of the defect occurs. The purpose of the invention is to increase the reliability of the control. The goal is to doch; it is blinded by the fact that the ultrasonic flaw detector is connected in series with the first trigger, two inputs of which are connected to the outputs of amplitude-time discriminators, a differentiating circuit, the OR circuit, the second trigger, the output of which is connected to the recorder's input, the third amplitude-time discriminator, the first the input of which is connected to the output of the amplifier, the second input from the output of the probe pulse generator, and the third trigger connected between the third amplitude-time discrimination Oromo and diagrams or. The drawing shows the block diagram of the ultrasonic flaw detector. The ultrasonic shadow immersion flaw detector contains a series-connected probe pulse generator 1, an emitting transducer 2, a receiving transducer 3 and an amplifier 4, amplitude-time discriminators 5 and 6, the first inputs of which are connected to the output of the amplifier 4, and the second inputs to the output of the generator 1 of probe pulses, and recorder 7. In addition, the flaw detector contains, in series, the first trigger 8, two inputs of which are connected to the outputs of amplitude-temporal discriminators 5 and 6, the differential circuit 9, circuit 10 OR, the second trigger 11, the output of which is connected to the input of the recorder 7, the third amplitude-time discriminator 12, the first input of which is connected to the output of the amplifier 4, - the second input - with the output of the probe pulses generator 1, and the third trigger 13, connected between the third amplitude-time discriminator 12 and the scheme OR 10. The flaw detector works as follows. From the output of generator 1 probing pulses arrive at the emitting transducer 2. In the event that the product being monitored is present and there is no defect, the receiving transducer 3 receives the feed of the passed pulses, and then they arrive at the amplifier 4. Amplitude-time discriminators 5 and 6 are set to the specified sensitivity level, which isolate the p-th and sh-th pulses necessary for further processing, and in case of the absence of a defect, give the necessary information in the form of rectangular pulses to the trigger inputs 8. Trigger-, 8 forms peace impulse, the leading front of which coincides with the time of arrival of the n-th, and the rear - of the ith of the arriving impulses. Through a differentiating circuit 9 and the scheme OR 10, this pulse triggers trigger 11 with its back edge. The presence of a square differential at its output prohibits the recording of a defect on the recorder 7. Before the start of each clock cycle, trigger 1 is reset. If there is a defect in the controlled product, at least one of the transmitted pulses (to the n-th or t-th) does not form at the output of the corresponding discriminator 5 or 6 of the rectangular pulse (the presence of a defect on at least one of the passed pulses means that the presence of in the product, the defect has weakened the amplitude of the bottom and the bottle in such a way that its value turned out to be less than the given sensitivity threshold). Therefore, the trigger 8 also does not work, and therefore on the output; a; e of the trigger 11, the pulse is absent. The registrar 7 fixes a defect in the product. In the absence of a controlled product, the amplitude of the transmitted pulse is large, which triggers the amplitude-time discriminator 12. The pulse from the output of the amplitude-time discriminator 12 triggers trigger 13. Needle pulse from trigger trigger output 13 through the circuit OR 10 triggers trigger 11. The presence of its output square differential prevents the defect from being recorded on the recorder 7. The proposed flaw detector allows to increase the control accuracy, since the absence of a controlled product does not lead to false registration of a defect ta. Ultrasonic shadow immersion flaw detector containing a series-connected probe pulse generator and a radiating transducer, receiving transducer and amplifier, two amplitude-time discriminators, the first inputs of which are connected to the output of the amplifier, and the second inputs to the output of the probe pulse generator, and a recorder that distinguishes . With the fact that / in order to increase the reliability of the control, it is equipped with series-connected first trigger, two inputs of which are connected to the outputs of amplitude-time discriminators, a differentiating circuit, circuit -1 {LIE, echo / i trigger, the output of which is connected to the input of the recorder, the third amplitude-time discriminator, the first input of which is connected to the output of the amplifier, the second input - with: the output of the probe pulse generator, and the third trigger connected between the third amplitude-time discriminator m and the scheme, or. Sources of information taken into account during the examination 1. Defectoscopy, 1975, No. 5, p. 93. 2. Authors certificate of the USSR 407227, cl. G 01 N 29/04, 1972 (. Prototype).