SU1377711A1 - Device for measuring parameters of cylindrical current-conducting objects - Google Patents

Abstract

The invention relates to non-destructive testing and can be used to measure the parameters of large-sized cylindrical electrically conductive objects made of a ferromagnetic material. Expansion of functionality due to the measurement of three parameters of ferromagnetic cylindrical objects is achieved by measuring and transforming the spatial harmonics of an electromagnetic field excited by an eddy current transducer 2, the exciting winding of which consists of sides 3 and 4 of a rectangular frame located on opposite sides of the frame. Spatial harmonics are measured using a measuring winding containing two groups of sections. The first group is formed by sections 5 and 8, connected in series to each other, and the second group - by sections 6,7.9, connected in series in accordance with. As a result of spatial harmonic processing, the diameter of the object being monitored, its specific conductivity and magnetic permeability are measured. 1 z.p, f-ly, 6 ill. 3 I and S (L 00

Description

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

The purpose of the invention is the simultaneous measurement of three parameters of ferromagnetic objects. The goal is achieved by measuring and transforming the spatial harmonics of the electromagnetic field of the excited eddy currents.

Figure 1 shows the spatial arrangement of the winding sections of the eddy current transducer; figure 2 - block diagram of the device; FIG. 3 is an electrical circuit for connecting sections of windings of an eddy current transducer; 4 - 6, the dependencies between the parameters of the sample and spatial harmonics.

A device for measuring the parameters of cylindrical electrically conductive objects consists of a generator 1, an eddy current transducer 2 and. signal processing unit Eddy converter 2 contains measuring and exciting windings in the form of frames stretched along a cylindrical detector 15, quad 18 and splitter 19 connected by a second input through a serially connected decision unit 20, a divider 21 connected by a second input to an output of an amplitude detector 10 and the third input with the setting device 22, and a quad 23 with the output of the decision block 17, a shower 24 connected by the first input with the output of the divider 19 and the second input with the output of the decision block 14, a three-channel indicator Attorney 25 connected by the first input to the output of the 15th switch 24, the second input to the output of the splitter 21 and the third input to the output of the decision block 14 "To increase the productivity of the control, it is recommended in a cylindrical frame

20 Fill the process window between sections 6 and 7 along the forming frame for its entire length.

The device works as follows

25 controlled cylindrical

Electrically conducting sample through the process window is placed in a vortex converter 2 "The setting device 22 is installed in accordance with the parachute frame (not shown). The sides are 30 meters of the measuring winding of the transducer. The input of the amplitude detector 10 receives a signal from the first group of sections. From the output of the amplitude detector 10, a signal proportional to

3 and 4 of the exciting winding are placed diametrically opposite to the axis of the cylindrical frame, the measuring winding consists of sections 5-9, each of which is made 35 and A1 of the first spatial-like frame with a plane, parallel harmonics through the 11th erected side panel the surface of the cylindrical frame, and located with an angular offset relative to the plane

neither the cube enters the first input of the divider 12; the second input of the divider 12 receives a signal proportional to

phase detector 15, quad 18 and splitter 19 connected by a second input through serially connected decider 20, divider 21 connected by a second input to an output of an amplitude detector 10 and a third input with a setting unit 22, and a quad 23 with an output of a decisive block 17, divider 24, connected by the first input to the output of the splitter 19 and the second input to the output of the decision block 14, the three-channel indicator 25 connected by the first input to the output of the splitter 24, the second input to the output of the splitter 21 and the third input to the output of the decision block 14 "D A higher performance control is recommended in a cylindrical frame.

Fill the process window between sections 6 and 7 along the casing for the entire length.

The device works as follows

Controlled Cylindrical

through the process window, the electrically conducting sample is placed into the eddy transducer 2 "The setting unit 22 is installed in accordance with the first and second harmonic spatial parameters A1 through the erection unit 11

neither the cube enters the first input of the divider 12; the second input of the divider 12 receives a signal proportional to

excitatory conductors, where if, О, 40 amplitude A3 of the third spatial harmonic, from the output of the amplitude detector 13, the input of which is connected to the second group of sections From the output of the divider 12 signal, are proportional (,, 240, and 1 5 300 sections 5 and 8 are connected series-counter and form a first group of sections, and sections 6,7 and 9 are connected in series and constitute the second group of sections. The signal processing unit consists of a series-connected amplitude detector 10, a cube-raising unit 11, a divider 12 connected by a second input through am the latent detector 13 jc of the second group of sections, the decision block 14 connected by the second input to the output of the phase detector 15 connected by a reference voltage through the phase shifter 16 to the output of the generator 1 and the signal input to the first group of sections of the decision block 17 connected by the second input way out

45

50

55

The national AZ / (A1) enters the first input of the decision block 14 The second input of the decision block 14 receives a signal from the output of the phase detector 15, which is proportional to the phase angle of the first spatial harmonic. The second input of the phase detector 15 receives the reference signal from the generator 1 through the phase shifter 16. The first decision unit 14 implements the conversion function, which is represented by the output signal of the first decision unit 14, which is proportional to magnetic permeability. the investigated product is fed to the input

 the amplitude A3 of the third spatial harmonic, from the output of the amplitude detector 13, whose input is connected to the second group of sections From the output of the divider 12 signal, is proportional to

The national AZ / (A1) enters the first input of the decision block 14 The second input of the decision block 14 receives a signal from the output of the phase detector 15, which is proportional to the phase angle of the first spatial harmonic. The second input of the phase detector 15 receives the reference signal from the generator 1 through the phase shifter 16. The first decision unit 14 implements the conversion function, which is represented by the output signal of the first decision unit 14, which is proportional to magnetic permeability. product under study, is fed to the input

the second 17 and third-20 decision blocks, one of the inputs of the indicator 25 and the input of the fourth divider 24, the second input of the decision block 17 receives a signal from the phase detector 15 proportional to the phase angle of the first spatial harmonic In the second decision block 17 a functional dependence is realized, The signal proportional to the generalized parameter X is shown in Fig. 5 from the output of the decision block 17 and is fed to the input of the third decision block 20 and through the first quad 18 to the input of the third divider 19 "From the output of the third decision block b LOCK 20, which implements the functional dependence shown in Fig. O6, a signal proportional to

k {k Ai -j; -), where D is the diameter of the investigated product; d is the distance between the diametrically opposite conductors of the measuring sections, is fed to one of the inputs of the divider 21, the second input of which receives a signal from the first amplitude detector 10. From the output of the divider 21, a signal proportional to the diameter D is fed to the second input of the indicator 25 and at one of the inputs of the third divider 19 through the second quadrant 23 o. The signal from the output of the third divider 19 is fed to the second input of the fourth divider 24, the output of which receives a signal proportional to the value of the specific electric current This signal is fed to the third input of the indicator 25.

The dependences presented in Figs 4-6 can be obtained by calculation and implemented using decisive amplifiers made in the form of digital or analog circuits. As a result, a separate measurement of the three parameters of ferromagnetic cylindrical objects, their diameter, specific conductivity 6 and magnetic permeability ft are achieved.

Claims (1)

Invention Formula 1 A device for measuring parameters of cylindrical electrically conductive objects, comprising a generator. ten 15 20 25 . " dd 30 35 50 55 eddy current transducer consisting of exciter and measuring windings in the form of frames extended along a cylindrical frame, and a signal processing unit, characterized in that, in order to extend the functionality by simultaneously measuring three parameters of ferromagnetic objects, the conductors of both opposite sides of the excitation frame placed on diametrically opposite sides of the cylindrical frame, the measuring winding consists of five sections located relative to the plane excitation windings with angular displacements (, iff БО, з 180, 1/4 240 and (/ 300 °, respectively, the first and fourth sections of the measuring winding are connected in series-counter and form the first group of sections, the second, third and fifth sections are connected sequentially-according to and form the second group of sections; the signal processing unit is designed as a first amplitude detector, connected in series by a second amplitude detector connected by an input to the terminals of the first group of sections, a cube-building block, a splitter connected in orym input via a first amplitude detector to the terminals of a second group of sections, the first and second critical blocks of the first squarer, a second divider, a third divider, a third divider and triple indicator, phase shifter, phase detector, Con-i. the reference input through the phase shifter to the generator, the signal input to the terminals of the second group of sections and the outputs to the second inputs of the first and second decision blocks, the second quadr, setting device and the fourth divider connected by the first input to the output of the second amplitude detector, the second input to the setting device and the entrance through the first quad-to the second input of the second divider, 2, the device pop, 1 differs with the fact that, in order to increase the performance of the control, c. A cylindrical frame of the converter is provided with a technological window: between the second and third sections along the generator of the frame to its entire length. / 3 eleven "-one YU (TLjp -grtit but 6,2O.t O.S Q.6 tfflPfi 0Ut. tf 22 sixteen 15 lif L 25 18 2il 23 phage. 2 Phi 3 KM