SU1670576A1 - Apparatus to measure the cylindrical conducting entity parameters - Google Patents

Abstract

The invention relates to non-destructive testing and can be used to measure the parameters of ferromagnetic cylindrical objects. The aim of the invention is to improve the measurement accuracy by eliminating the influence of the higher spatial harmonics of the magnetic field on the measurement result. The alternator 1 signal is compared by a phase shift with the information signal, and a predetermined phase shift in the setpoint generator 26 is achieved by varying the frequency of the alternator 1. Upon its achievement, key 27 is turned on and the information signal is processed by decision blocks 9 and 10, and information in the form of relative magnetic permeability, diameter, and specific electrical conductivity is recorded by a three-channel indicator 13. 2 Il.

Description

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The invention relates to non-destructive testing and can be used to measure the parameters of ferromagnetic cylindrical objects.

The aim of the invention is to improve the measurement accuracy by eliminating the influence of the higher spatial harmonics of the magnetic field on the measurement results.

FIG. 1 shows a block diagram of the device; Fig. 2 shows the structure of a vortex converter.

The device (Fig. 1) contains two alternating and direct current generators 1, 2, eddy current transducer 3 and switch 4, connected between the outputs of alternating current and direct current generators 1 and 2 and eddy current transducer 3

The device also contains a key connected in series 5. connected to the eddy current transducer 3, integrator 6, amplitude detector 7, divider 8 decision unit 9, decision unit 10, divider 11, divider 12 and three-channel indicator 13.

In addition, the device contains a serially connected key 14 connected to an eddy current transducer 3, an integrator 15, an amplitude detector 16, a divider 17, the second input of which is connected to the output of the amplitude detector 7, a divider 8 whose output is connected to the second input of the divider 11, and the unit 19 extract the square root, the output of which is connected to the second input of the three-channel indicator 13, and the adder 20, the input of which

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Combined with the third input of the three-channel indicator 13 and connected to the output of the decision block 9. And the output of the adder 20 is connected to the second input of the divider 18.

The device also includes a series-connected phase shifter 21 connected to the output of an alternator 1, phase detector 22, the second input of which is connected to the key 5, a zero-indicator 23, an unbalance amplifier 24, and a frequency modulator 25, the output of which is connected to the input control generator 1 AC, and the setting device 26, the output of which is connected to the second inputs of the null indicator 23 and decision blocks 9, 10. The device also contains a serially connected key 27, the input of which is connected to the key 5, and the control input The od is connected to the second output of the null indicator 23, the amplitude detector 28 and the divider 29, the output of which is connected to the second input of the divider 8, and the frequency detector 30 connected between the output of the alternator 1 and the second inputs of the dividers 12 and 29. The eddy current converter 3 contains (Fig. 2) the magnetizing winding 3 and two sections 32 and 33 of the measuring winding, located coaxially and connected in opposite directions. FIG. 2 also shows the controlled product 34.

The device works as follows.

Initially, keys 4, 5 and 14 are set to position a, and keys 27 are open. The direct current generator 2 energizes the exciting winding 31. Then the key 4 switches and the received voltage pulse through the integrators 6 and 15 goes to the amplitude detectors 7 and 16, from the outputs of which the detected signal goes to the dividers 8 and 17.

Then the keys 5 and 14 are switched to position b and the output of section 32 of the measuring winding is connected to the signal input of the phase detector 22, the reference input of which is connected through the phase shifter 21 to the output of the alternating current generator 1. After switching the key 4, the output of the phase detector 27 produces a signal proportional to the phase shift value, which is compared by the null indicator 23 with the nominal value set by setpoint 26. If they are not equal, the zero indicator 23 controls the frequency of the alternator 1 through the unbalance amplifier 24 and the frequency the modulator 25. Upon reaching a predetermined phase shift value, the null indicator closes the switch 27, and an amplitude detector 28 is connected to the measuring winding section 32, the output of which produces a signal falling on the divider 29. to the second input of which a signal is supplied from the frequency detector 30. Poe calculating the signal through the divider 8 enters the input of the decision block 9, the second input of which receives the calibrated signal from the setting device 26. From the output of the decision block 9 a signal proportional to the relative magnetic permeability, enters the three-channel indicator 13, the decisive block 10 and the adder 20. From the output of the adder 20, the signal through the divider 18 and the block 19 of the square root

the three-channel indicator 13 comes in, carrying information about the diameter of the tested product 34. The decision block 10, based on the signal of the setting device 26, generates a signal which through the dividers 11 and 12 enters

to the third input of the three-channel indicator 13, carried information on the specific electrical conductivity.

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Claims (1)

Invention Formula A device for measuring the parameters of cylindrical electrically conducting objects, containing an eddy current transducer, with excitation and measuring 0 by two-section windings, alternately connected alternator, phase shifter and phase detector, the first amplitude detector, the first divider and the first and second crucial blocks, the second and third dividers and the three-channel indicator connected in series, and the second amplitude detector and the fourth in series 0 divider and adjuster, characterized in that, in order to improve measurement accuracy, it is equipped with a DC generator, the first key connected between the outputs of alternating generators 5 and direct currents and the exciting winding of the eddy current transducer, the second and third keys connected respectively to the section of the measuring winding of the eddy current 0 converter, two integrators connected respectively between the outputs of the second and third switches and the inputs of the first and second amplitude detectors, sequentially connected by an accumulator. the input of which is combined with the second input of the three-channel indicator and connected to the output of the first decision unit, the fifth divider, the second input of which is connected to the output of the fourth divider by a square extraction unit the root, whose input is combined with the second input of the second divider, the first input connected to the output of the second decision unit, and the output connected to the third input of a three-channel indicator connected in series by a fourth key, the input of which is combined with the second input of the phase detector and connected to the second key, the third amplitude the detector and the sixth divider connected to the second input of the first divider, the first input of which is combined with the second input of the fourth divider, a zero-indicator connected by the first input to AZOV detector, combined with a second input of the second inputs of the first and the second-critical Editor V. Trubchenko Compiled by Yu. Glazkov Tehred M. Morgental 0 units and connected to the setpoint, the first output of the null indicator is connected to the control input of the fourth key, connected in series by an unbalance amplifier connected to the second output of the null indicator, and a frequency modulator connected to the input of the alternator and a frequency detector connected between output of the alternator and the second inputs of the third and sixth dividers, exciting and measuring windings of the eddy current transducer are made in the form of coaxial solenoids, measuring section The boots are made identical and are included in series-counter. Fig-2 Proofreader N. King