SU1288578A1 - Device for calibrating checking of eddy-current equipment - Google Patents

Abstract

The invention relates to a measurement technique, namely, to the metrological provision of eddy current instruments measuring the conductivity of non-magnetic conductive products, and can be applied in various fields of engineering. The purpose of the invention is the verification of eddy current conductivity meters by reproducing different values of specific conductivity by changing the air gap between non-conductive disks, the thickness of one of which is smaller and the other larger than the depth of penetration of eddy currents. The formation of various air gaps is provided by the reciprocating movement of the interacting balls, one of which is in contact with the thicker disk, and the other interacts with the pusher of the micrometer screw. 1 il. (L th 00 00 SP 00

Description

one

The invention relates to a measurement technique, namely, to the metrological provision of eddy current instruments, measuring electrical conductivity of non-magnetic conductive products, and can be applied in various fields of engineering.

The purpose of the invention is the verification of eddy current conductivity meters by reproducing various values of specific electrical conductivity.

The drawing shows a diagram of the proposed device.

The device comprises a housing 1 in the form of two rigidly connected at an angle of 90 cylinders with a common internal cavity, placed in the housing 1 of the transducer 2 of the vortex device, two metal substrates in the form of balls 3 and 4, the diameters of which are equal to the internal diameters of the cylinders of the housing I, interacting between each other and installed with the possibility of reciprocating movement one — along the axis of the converter 2, and the other — perpendicular to the indicated axis, and two disks 5 and 6 of the nonmagnetic conductive material are placed s in PA-,-parallel planes perpendicular to the axis of the transducer. The first disk 5 is mounted for movement by means of a spring 7 and contacts the surface of one of the balls 3, the second disk 6 is rigidly fixed in the housing, the converter 2 is installed on the second disk 6, and the top disk on the first disk 5 is selected more, and the second Disk 6 - less depth penetrating eddy currents.

The reciprocating movement of the balls 3 and 4 is carried out with the help of the pusher 8, the spring 9 and the micrometric screw 10.

Verification of the eddy current conductivity meter using the device is carried out in the following way.

Using a set of standard samples with known values, the eddy current conductivity meter 6 is turned. Then the converter 2 of the verified device is thus installed against the disk 6. The gap between the disks b and 5 is minimal and the initial reading is determined

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on the reading scale of microscrew 10. Yes15

20

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Further, by rotating the thumb screw 10, the ball is displaced 4 "Under the action of the spring 7, the disk 5 is displaced downwards, forming

5, the gap h, which reproduces another value 6, the value of which is determined by the indications of the reading device of the eddy current device. Get a number of values for-.

JO of h, for which the readings of the eddy current device (6) and the corresponding number of divisions of the microscrew scale 10 are recorded. According to the data obtained, a table is created between the divisions of the microscrew reference scale 10 and the eddy current instrument readings for different values of the gap h. Under the operating conditions of the eddy current meters, the microscrew 10 sets the gap values for reproducing the necessary values in. By which the accuracy of the readings of the instruments is verified.

I

The use of disks 5 and 6 of non-magnetic conductive materials, the thickness of which, respectively, is one less and the other t more;

30 of the penetration depth of the currents, by varying the values of the air gap h between them, reproducing different values, the specific electric conductivity, b. it

 is achieved due to the fact that the alternating electric field from the excitation windings, the transducer 2 penetrates through the disk 6 and the dielectric gap h, passes into the disk 5 ..

40 With this. The OUTPUT signal from the measuring windings of the transducer 2 varies in magnitude from the gap size h.

Claims (1)

45 claims A device for checking eddy-instruments, comprising a housing in the form of two rigidly connected 50 at an angle of 90 cylinders with a common internal cavity, located in the transducer of an eddy current device, two metal substrates in the form of balls, the diameters of which are the inner diameters of the cylinders of the case, interacting with each other and installed with the possibility of reciprocating movement one along the axis Further, by rotating the thumb screw 10, the ball is displaced 4 "Under the action of the spring 7, the disk 5 is displaced downwards, forming The new gap, h, reproduces a different value of 6, the value of which is determined by the readings of the reading device of the eddy current device. Get a number of values for-. bore h for which the eddy current instrument readings (6) and the corresponding number of divisions of the microscrew scale 10 are recorded. According to the data obtained, a table is created between the divisions of the microscrew reference scale 10 and the eddy current instrument indications for different values of the gap h. Under the operating conditions of the eddy current meters, the microscrew 10 sets the gap values for reproducing the necessary values in. By which the accuracy of the readings of the instruments is verified. I The use of disks 5 and 6 of non-magnetic conductive materials, the thickness of which, respectively, is one less, and the other t more; the depth of penetration of currents, by varying the values of the air gap h between them, the reproduction of different values, the specific electric conductivity, b. it is achieved due to the fact that the alternating electric field from the excitation windings, the transducer 2 penetrates through the disk 6 and the dielectric gap h, passes into the disk 5 .. Wherein . The OUTPUT signal from the measuring windings of the transducer 2 varies in magnitude from the gap size h. Invention Formula A device for checking eddy-instruments, comprising a housing in the form of two rigidly connected at an angle of 90 cylinders having a common internal cavity, located in the converter housing of an eddy current device, two metal substrates in the form of balls, the diameters of which are the internal diameters of the housing cylinders, interacting with each other and installed with the possibility of reciprocating movement one along the axis the converter, and the other, the perpendicular, is the diccurrently specified axis, and two disks placed in parallel planes perpendicular to the axis of the converter, the first of which is mounted for movement and contacts the surface of one of the balls, characterized in that eddy current conductivity meters, the disks are made of non-magnetic current-conducting material, the second disk is rigidly fixed in the housing, the converter of the eddy current device is installed on the second disk, the thickness of the first disk is selected lsche and second disc - less than the depth of penetration currents. X h Editor O. Bugir Compilers And, Rekunova Tehred L.Oleynik Proofreader M. Pojo Order 7800/41 Circulation 776 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Design, 4.