SU926595A1 - Device for ultrasonic shadow flaw detection of three-layer structures - Google Patents

Description

() DEVICE FOR ULTRASOUND SHADOW DEFECTSCOPY OF THRE-LAYER STRUCTURES

one

The invention relates to an instrumentation engineering and can be used for ultrasonic shadow flaw detection of three-layer structures.

A device for ultra-sound shadow flaw detection is known, comprising a synchronizer connected in series, an ultrasonic pulse generator and a radiating transducer, and a receiving transducer, amplifier, decoder and recorder. This device allows you to determine the coordinates of the defect by area Ln „

A disadvantage of this device is the impossibility of determining the depth of the defect, as a result of which the automation of control is difficult.

The purpose of the invention is the provision of automation control.

This goal is achieved by the fact that in the device for ultrasonic

shadow flaw detection of three-layer structures containing a synchronizer connected in series, an ultrasonic pulse generator and a radiating transducer, as well as a receiving transducer, amplifier, decoder and recorder, equipped with an additional radiating transducer whose input is connected to the output of the ultrasonic generator

10 pulses and an additional receiving transducer with an amplifier loaded on the decoder, rigidly fixed at a fixed distance, respectively, from the main

15 radiating and receiving transducers.

The decoder is made up of four channels, each of which consists of a coincidence circuit, an adder, and

Claims (1)

20 flip-flops, and the output of each receiver transducer is connected to the input of the coincidence circuit of two channels, the trigger outputs of which are fed to the individual 9 jHbie recorder inputs, and the decoder is equipped with two strobe pulses, one of which is designed to form an ultrasonic pulse direct passage zone, the other cross, the inputs of which are associated with the synchronizer, and the output of each of. they are with the second inputs of the coincidence circuit of one of the decoder channels of each receiving transducer. The drawing shows a diagram of the proposed device. The device contains ultrasonic pulses connected in series synchronizer 1, generator 2 of the main and additional radiating transducers 3 and, successively connected in two channels clear and additional receiving converters 5 and 6, amplifiers 7 and 8, the outputs of which are connected to the decoder inputs , made in the form of four channels, each of which consists of schemes 9-12 matches, adders 13-16 and triggers 17-20, strobe-pulse generators 21 and 22, recorders 23 and 2, and alarms 25 and 26. The device operates in a manner Synchronizer 1 at equal intervals of time starts the generator 2 of ultrasonic pulses, which in cBQjp turn, will impulse the pulses simultaneously to the main 3 and additional k emitting transducers. Ultrasonic pulses, the passage through the controlled three-layer structure 27, in the case of defect 28 on the left, will pass only between the transducers 4, 6 tons, 5 (in the radial approximation), and between the transducers 3, 6 and 3.5 the signal flow is disturbed. Strobe pulse generators 21 and 22 produce gates to locate a defect in the gluing zones. Circuit 9, for example, does not work, since the signal between converters 3 and 5 (direct) does not pass due to a defect. The coincidence circuit 10 is triggered, since the signal from the additional radiating transducer k arrives at the main receiving transducer, and it is gated by the second gate (from the gate pulse generator 22). Scheme 11 coincides as at an additional reception stage. The former 6 has a direct pass signal (between transducers 4 and 6), and is gated by the first gate pulse from the gate pulse generator 21. Circuit 12 does not work, so as the signal between converters 3 and 6 does not pass. Triggered circuits 10 and 11 match the signal to adders 14, 15 and 16, which, in turn, return this signal to triplers 18, 19 and 20 to the initial state. Only the trigger 17 does not return to the initial state, since the signals of circuits 9 and 12 of coincidence are not supplied to the adder 16. The trigger 17 remains in the cocked state, in which it is driven by a synchronization pulse together with the triggers 18, 19 and 20. The trigger signal 7 through the register 23 actuates the warning lamp 25 or another actuator, for example, lighting the defect signal lamp to the left of the warning lamp 25. The scheme works similarly for other cases of defect, ignition of the defect signaling lamp to the left or to the right .. Since the time is from the moment of triggering the trigger with a synchronization pulse until it is reset to its original state by a decoder pulse ( If the signal is many times shorter than the time between two synchronization pulses, the indicator lamp only lights from the trigger that is not reset. The relay does not work during this time, if it is used as a recorder. The introduction of an additional pair of sensors and a decoder allows, during continuous scanning, to fix the side of the occurrence of the defect. This makes it possible to automate the process of monitoring and recording the defectogram with the indication of the side of the defect or the defect. Claim 1. Device for ultrasonic shadow flaw detection of three-layer constructions, containing a connected HSE, a synchronizer, an ultrasonic pulse generator, and a radiating transducer, and the receiving transducer j is an amplifier, a decoder, and a recorder, so that, in order to enable the automation of control, it equipped with an additional radiating transducer, the input of which is connected to the output of an ultrasonic pulse geiHepaTOpa and an additional receiving transducer with an amplifier, loaded on the decoder, rigidly fixed to fixed 1 st condition, respectively, from the main radiating and receiving transducers. 2, The device according to claim 1, which is designed so that the decoder is made in the form of four channels. each of which consists of a scheme match, adder and trigger, and the output of each receiving transducer: The Ovatel is connected to the input of the matching circuit of two caries, the trigger outputs of which are fed to the individual inputs of the recorder, and the decoder is equipped with two strobe-pulse generators, of (HH of which is intended for direct zones the passage of the ultrasound pulse, the other cross, whose inputs are connected to the synchronizer, and the output of each of them to the second inputs of the coincidence circuits of one of the channels the decoder of each receiving converter. Sources of information taken into account in the examination 1. USSR author's certificate ff lezStb, cl. G 01 N 29/0 1969 (prototype).