SU1538110A1 - Device for checking and calibrating eddy-current device - Google Patents

Abstract

The invention relates to non-destructive testing and can be used for the calibration and calibration of eddy current testing tools. Improving the performance and accuracy of verification and calibration is achieved by digitally controlling the change in operating modes and parameters of the simulation signal. The device simulates a signal corresponding to the effects of a defect in static and dynamic modes. In the static mode, the switches 19 of the phase setting unit 7 and the switches 20 of the amplitude setting unit 9 set the required phase and amplitude values. When voltage is supplied from the switch 24, an installation pulse is generated at the output of the single vibrator 23, the corresponding codes are written to the counters 16 and 18, and a defect imitation signal is sent to the exciting winding 4. In the dynamic mode, when the switch 21 is pressed, the counting inputs of the counters 16 and 18 are received by the generator 22, the counters operate in the counting mode, and the exciting winding 4 is supplied with a voltage varying according to specified laws. 2 hp f-ly, 1 ill.

Description

exciting winding 4, shaper f of the law of phase modulation, shaper 6 of the law of amplitude modulation. The second inputs of the modulator 2 are connected to the outputs of the shaper 5 of the one-time modulation law, and the second inputs of the modulator by the 3rd outputs of the shaper 6 of the amplitude law, modulation. In addition, the device contains blocks for setting phase 7, modes 8 and setting amplitudes 9. The first inputs of shaper 5 are connected to the outputs of block 7 for specifying the phase, and the second inputs are connected to the outputs of block 8 of modes. The first inputs of the former 6 of the law of amplitude modulation are connected to the outputs of block 9 specifying the amplitude, and the second Inputs are connected to the outputs of the block of 8 modes.

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Modulator 2 contains an integrator 10, KVA multiplying digital-analogue converters (UTsAP) 11 and 12, and a combinator 13. The output of the generator 1 is connected to the analog input of UCAP 12 and the input of integrator 10, the output of which is connected to the analog input of UCAP 11. The outputs of UCAP Both and 12 are connected to the inputs of the adder 13, the output of which is connected to the analog input of the UCAP module 3. The shaper 5 of the phase modulation law contains two permanent memories (ROM) 14 and 15 and a phase counter 16, outputs

WHICH HAVE CONNECTED TO SINGLE-NOMINAL AD

The main inputs of ROM 14 and 15. The outputs of ROM 14 are connected to digital inputs of UCAP 11, and the outputs of ROM 15 to digital inputs of UCAP 12. Shaper 6 contains ROM 17 and amplitude counter 18, the outputs of counter 18 are connected to address inputs of ROM 17, the outputs of which connected to the digital inputs of the modulator 3.

five

0

WITH

about 5

g

five

16 and 18, one contact of the switch 24 is grounded, and the second is connected to the input of a single-vibrator-23, the output of which is connected to the inputs of the installation of meters. 16 and 18.

The device works as follows.

The signal TJsinW t from the output of the generator 1 is fed to the input of the integrator 10, shifting the input signal by 90 °, resulting in the output of the integrator JO there is a signal Usin (u) t + 90 °) - Ucoswt, which is fed to the analog input of UCAP- P . The analog input UCAP J 2 receives a signal from the output of generator J, the digital inputs of UCAP J. 1 and J 2 are binary codes from the data outputs of ROM 14 and 15, respectively. ROM 14 contains binary codes of the sin OCt function ) for 4 (t) 0-360 °. In this case, the values of Kt) are set according to the required laws of phase modulation and are selected according to the signals from the outputs of the counter 16. Similarly, the values of the function costif (t) are recorded in the ROM 15. Multiplying the corresponding analog signals of these UCAPs in the adder 13 gives the output signal of the phase modulator 2 in the form

IFD Usinwtcos Јif (t) +

+ Coscotsin h (o +

+ if (t) j.

The output signal of the modulator 2 is fed to the analog input of the amplitude modulator 3, the output of which is the signal U) ((t) x) t + l / (t) J, fed to the exciting winding 4. Coefficient K (t)

determined by the binary code on the data outputs of the ROM 17 and characterizes the law of amplitude modulation. Codes K (t) are selected in order of increasing addresses by signals from the outputs of counter 18.

The device generates a defect signal. in static mode or signal when moving the defect through the working area of the converter (dynamic mode).

In the static mode, the switches of phase setting switch 7 and the setting of amplitude switch switches 20 of the amplitude setting 9 set the required values of phase and amplitude. By pressing the switch 24 at the output of the one-oscillator 23, an installation pulse is generated, the corresponding codes are written to the counters 36 and 18, and a defect imitation signal is sent to the exciting winding 4.

In dynamic mode, when the switch is pressed, the generator 22 pulses are fed to the counting inputs of counters L 6 and 18, the counters operate in

the counting mode, and a signal is supplied to the exciting winding, the phase and amplitude of which change according to

 the laws. When installing the ROM 14, g 15 and 17 circuits in the panel by replacing the mentioned ROMs, it is possible to simulate according to various laws of amplitude and phase modulation.

Claims (3)

1. A device for checking and calibrating 40; the devices and inputs of the amplification counter of eddy current devices, the content of which is the output and the inputs of the generator, successively amplitude lodular phase modulation and amplitude modulation, respectively , p amplitude, tori, shaper of the law of the phase modulator is made in the form of the third modulation and the shaper of the law of amplitude digital analogue predominant modulation, connected to the output dami to the second inputs of the amplitude and phase modulators, respectively, and the exciting winding is different. 2. The device according to claim 1, that is, so that, in order to increase it so that the unit of the mode of performance and accuracy, the move is made in the form of a generator so - it is equipped with a phase setting unit, block pulses, a one-shot and a amplitude setting unit and a mode block, two mode switches, one end of the generator is connected to the input fakt of the first switch, and the output modulator gg another is connected to the input of the one-phase phase connected to the first input of the input device, the output of which is a transducer for it -vym phase modulator block modes and output prednaz- tion, amplitudynachen specifying unit outputs for connection to u.sta- inputs connected to first inputs of counters formation Novki one contact vtoro715381108 This switch is connected to the output of the amplitude and phase in a clock pulse generator, and the other, in the form of a set of two-position switches, is the second output of the unit of speakers, the common contacts of which are intended for connection from the information to the counting inputs of the counters. the counter inputs, the first switch contacts with the same name 3. The device according to claim 1, about tl and -grounded, and the latter are connected to power supply voltage blocks.