SU1388779A1 - Electromagnetic flaw detector - Google Patents

Abstract

The invention relates to non-destructive testing of materials and products by electromagnetic methods and can be used in the inspection of products from low-conducting composite materials. The aim of the invention is to increase the reliability of the flaw detection by automatically adjusting the effect of the gap and registering both active and reactive introduced resistances. In two consecutive measurement cycles, the switch 15 switches the resonant systems 16 and 17, the signal from which is converted into a burst of pulses fed to the counters 9 and 12 and the meter 5 of the number of pulses. The measurement results are successively compared with the target values in counters 9 and 12, and when these values are reached, the flip-flops are switched. 10 and 13. In the event that the enabling signal from the flip-flops arrives at both inputs of the conjugator 8, then an enable signal will arrive at the input of the inhibitor of the meter 5 of the pulses, fixing the measurement result. 1 il. with y (L S

Description

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The invention relates to non-destructive testing of materials and products by electromagnetic methods and can be used in industry in the course of defectoscopy of products from low-conducting composite materials.

The aim of the invention is to improve the reliability of flaw detection by automatically adjusting the effect of the gap and registering both active and reactive impedances.

The drawing shows a structural diagram of an electromagnetic flaw detector.

The flaw detector contains an autogenerator 1 connected in series, an amplitude conversion signal circuit 2, a transducer 3 for a time interval, a key 4, and a pulse number meter 5.

The flaw detector also contains, connected in series, a control pulse generation unit 6 and a selector 7, the output of which is connected to the second input of the key 4 and the second input of the voltage converter 3 in the time interval, conjunctor B the output of which is connected to the inhibit input of the meter 5 of the number of pulses connected in series counter 9, the clock input of which is connected to the output of the key 4, the trigger 10 and the delay element 11, the second input of which is connected to the output of the selector 7, and the output connected to the coJunctor 8, and connected after Consequently, the reversive counter 12, the clock input of which is connected to the output of the key 4, and the trigger 13, the output of which is connected to the second input of the conjunctor 8.

The oscillator 1 contains a self-excited amplifier 14, a switch 15, whose output is connected to a self-excited amplifier 14, and two resonant systems 16 and 17 with eddy current converters (not shown) connected to the switch 15,

Block 6 forming control pulses contains connected in series pulse generator 18, the output of which is connected to the remote control input key 4, and the frequency divider 19, the output of which is connected to the control input of the switch 15 and the installation inputs of the counter 9,

reversible counter 12, triggers 10 and 13 and the meter 5 of the number of pulses.

The device works as follows.

In accordance with the output signal of the frequency divider 19, the switch 15 alternately connects to the amplifier 14 with self-excitation resonant systems 16 and 17 with eddy-current converters. Amplitude signal conversion circuit 2 highlights the high frequency voltage envelope. The received signal is converted into a time interval filled with quantizing pulses from the generator of 18 pulses.

The pulses from the output of the key 4 are fed to the meter 5 of the number of pulses, the reversible counter 12 and the counter 9. The counters 9 and 12 compare the number of incoming pulses with a predetermined value, and when they overflow, the trigger 10 and 13 "are switched. When two logical units arrive flip-flops 10 and 13 a logical unit appears at the output of conjuncture 8 at its output, allowing the registration of the measurement result with the pulse number 5,

ABOUT

Claims (1)

Invention Formula Electromagnetic flaw detector containing an autogenerator, made in the form of serially connected two resonant systems with eddy current transducers, a switch and an amplifier with self-excitation, a control pulse shaping unit and a key connected in series, the control input of which is connected to the control pulse shaping unit, and a pulse number meter, characterized in that, in order to increase the reliability of the flaw detection, it is equipped with a successively connected amplitude circuit reobrazovani signal connected to the output of the amplifier with a self-excited, and. a voltage to time converter, the output of which is connected to the key, connected in series by a counter, the clock input of which is connected to the output3 13887794 the key, the first trigger and the element with the input of the switch, the inputs of the delay set, the connected sequence of the counter, the reversible counter-counting reversible counter, as well, the trigger, and the meter, the number input is connected to the number of pulses and connected to the switch , the second trigger and the coil-run of the formation unit by the controller, the second input of which is the connecting pulses, and the output of the selector whose output of the delay element is connected to the second inputs of the output element is connected to the second input of the delayed switch, key and transform Ba quantity Measurer pulses and10 bodies voltage in the time interselektorom whose input obedinenval.