SU1280529A1 - Multichannel ultrasonic flaw detector - Google Patents

Abstract

This invention relates to ultrasonic flaw detection and can be used in multichannel monitoring systems. The purpose of the invention is increased reliability. When the power is turned on through the switch 20, the capacitor 18 of the converters 14 is charged by the power source 21 with a signal equal in level and sign to the signals of the generator 4 ultrasound

Description

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fluctuations. The synchronizer 1 generates a signal that sets the trigger 2 to the operating position at which the switch 20 closes. Simultaneously from the trigger 2, the signal through the decoder 13 opens the capacitor 18 discharge circuit. After the delay time of the delay element 3 is turned on, the ultrasonic oscillator 4 is turned on and the piezotransducer 17 is excited . The remaining piezo transducers of other channels will not be excited. The signal reflected from the defect is then amplified, selected in time and amplitude, and through the decoder 11 enters the defectomer 12. The next pulse of the synchronizer will prepare the piezoelectric transducer of the next channel for operation in the same way. 1 PC.

This invention relates to ultrasonic flaw detection and can be used in multi-sensor systems for quality control of products. The aim of the invention is to increase reliability. The drawing shows a diagram of the ultrasonic flaw detector. The device contains synchronized. 1, the output of which is connected to one of the inputs of the trigger 2, through the delay element 3 to the input of the ultrasonic oscillator 4 and the delay circuit 5 consisting of the time selector 6, the strobe generator 7, also connected to the second of the trigger input 2 and element 8 And, the second input of which is connected to the output 9 of the amplifier, and the output is connected with series-connected amplitude selector 10, decoder 11 and defecto-meter 12. Trigger 2 through decoder 13 is connected to the corresponding inputs of the decoder 11. and with each of the n converters 1 4, in turn, consisting of a series-connected resistor 15, a diode 16, which is connected to the output of the ultrasonic oscillator 4. A piezotransducer 17 is connected to the connection point of resistor 15 and cathode of diode 16, a capacitor 18, the second code of which is connected to the output of amplifier 9, and a diode 19, whose anode is connected to the positive pole of power supply 21 via switch 20. The second input of the switch 20 is connected to the output of the trigger 2. The flaw detector works as follows. When the power is turned on through the switch 20 and the diodes 16 of the converters 14, the capacitor 18 of the piezo transducers 17 are charged from the power source 21. The synchronizer 1 generates a signal that triggers the delay element 3 and the delay circuit 5 and sets the trigger 2 to the operating position. The trigger 2 closes the switch 20, thereby disconnecting the power supply 21 from the piezoelectric transducers 17. At the same time, the trigger 2 through the decoder 13 and the resistor 15 discharges the capacitance piezoelectric transducer 17, for example the first channel. After the end of the discharge, the delay element 3 starts the oscillator 4 of ultrasonic oscillations, the pulse from which, through the diode 16, excites the piezoelectric transducer 17 of the channel under consideration. The rest of the piezoelectric transducers 17 will not be excited, since they will have previously received voltage from the power source 21, equal in sign and level to the impulse of the ultrasonic oscillator 4. The signal received by the piezoelectric transducer 17, reflected by a defect or other reflector, is fed through the capacitor 18 to the input of amplifier 9 and then to one of the inputs of element 8 I, the second input of which receives a gate pulse from the generator 7 of the gate. When the strobe-pulse and the reflected signal coincide at the output of element 8, a signal appears that is proportional to the amplitude of the reflection signal, which is fed to the input of the amplitude selector 10. When the received signal level exceeds the set threshold of the amplitude selector 10. the output of the latter appears to be a signal arriving at the input of the decoder 11, to the corresponding inputs of which a signal is fed from the outputs of the decoder 13. The coincidence of the signal from the channel of the decoder 13 and the signal of the amplitude selector 10 through webbings allowed to define the channel number, which belongs otrazhenny received signal and pass it defektootmetchiku 12. After the strobe generator 7 strobe sets its trailing edge trigger 2 to the initial position. Switch 20 again connects power supply 21 through diodes 19 in piezoelectric converters 17. Decoder 13 interrupts the discharge circuit of piezo transducer 17 of the first channel and its capacitance is charged along the circuit of power supply source 21 21, switch 20-diode 19. The next synchronizer clock 2 will prepare for operation the next the converter 14 and the operation of the circuit is repeated. 12 9 4 Formula of the Invention A multichannel ultrasonic flaw detector containing a synchronizer, a first decoder, n transducers connected to their inputs an ultrasonic oscillator, a second decoder, a time selector, an amplitude selector, an amplifier and a defect tester, characterized in that, in order to improve reliability It is equipped with a series-connected trigger and a switch, the output of which is connected to the control inputs of the converters, connected to the second input of the switch, the power source, after orally connected by a strobe generator and an element whose second input is connected through an amplifier to transducer outputs, and an output through an amplitude selector to a control input of a second decoder connected by an output to a defectometer, and a delay element whose output is connected to the input of an ultrasonic oscillator , the synchronizer output is connected to the inputs of the trigger, the delay element, the time selector, the output of which is connected to the generator input of the strobe, the second input of the trigger is connected to the generator output strobe, and the output - to the input of the first decoder, the outputs of which are connected to the inputs of the transducer discharge circuits and to the inputs of the second decoder.

Claims (1)

Formula of Invention A multichannel ultrasonic flaw detector containing a synchronizer, 5 first decoder, η transducers connected to their inputs — an ultrasonic oscillation generator, a second decoder, a time selector, an amplitude selector, an amplifier and 10 flaw detector, which distinguishes with the aim of increasing reliability, it is equipped with a trigger and a switch connected in series, the output of which is connected to the 15 control inputs of the converters, a power source connected to the second input of the switch, sequentially connected the gate generator and the element And, the second input 20 of which is connected through the amplifier to the outputs of the transducers, and the output through the amplitude selector to the control input of the second decoder connected to the output of the detector 26, and the delay element, the output of which is connected to the input of the ultrasonic oscillator, the output the synchronizer is connected to the inputs of the trigger, the delay element, a temporary 30 selector, the output of which is connected to the input of the strobe generator, the second input of the trigger is connected to the output of the strobe generator, and the output is to the input of the first decoder, the outputs of which 35 are connected to the inputs of the discharge circuits of the converters and to the inputs of the second decoder.