SU635437A1 - Tuning simulator - Google Patents

Description

one

The invention relates to a measurement technique, in particular to measurement by the method of eddy currents, for example, electrical conductivity.

Known tuning simulators, made of metals or alloy (copper, aluminum, MHfmft, titanium and their alloys), of carbon graphite or copper graphite materials with electrical conductivity in the range (0.01- 60) - 10 Cm / m 1.

However, these simulators are characterized by the complexity of manufacturing them with a predetermined value of electrical conduction, since the electrical conductivity of the finished materials may change by a small amount, and to change it to large values, a change in the manufacturing process of this material is necessary, which is expensive and difficult.

The closest to the technical essence of the invention are tuning simulators containing alternating layers of materials with different electrical conductivities, the thickness of each of which is less than the penetration depth, and the thickness of the layered element is greater than the penetration depth of the eddy currents 2.

However, these simulators are difficult to manufacture, since their electrically conductive element is made of many tens

very thin layers. The number of layers varies in the range of 40-80 pcs., The thickness of the layers is 0.005-0.01 mm. An electrically conductive element consisting of many tens of layers of small thickness is difficult to combine into one whole, as a result of which the entire element is fragile (breathes), which does not allow to obtain equally accurate measurements along the length of the simulator.

The purpose of the invention is to improve the accuracy of imitation.

This is achieved by the fact that in the simulator containing alternating layers of material with different electrical conductivities, one of the outermost layers is 1–56 thick, and the total thickness of the remaining layers is chosen 0.01–0.996, where b is the penetration depth of eddy currents .

The drawing schematically shows the structure of the tuning simulator.

The simulator is made of layer 1 with a thickness of 1-56 n layers 2 and 3, the total thickness of which is 0.01-0.996. Layers 2 may have greater and layers 3 less conductivity n, on the contrary. Dielectric films, adhesives, air gaps, etc. can be used as layers with lower electrical conductivity.

Due to the use of a layer with a thickness greater than the penetration depth of eddy currents in the simulator, it is possible, with a minimum number of c.ioei5 (three), to very accurately reproduce the properties of solid objects of measurement. The magnitude of the electrical conductivity can vary in a predetermined range, for example, by making a single layer of variable thickness. This allows you to create one multi-valued scale simulator for the entire measurement range for any instrument instead of a set consisting of many unique simulators.

The width and length of the simulator are determined by the physicotechnical parameters of the transducer 4, installed when working on the simulator so that its contact part is in contact with the surface of the simulator.

Tuning simulator works as follows.

Determination of the equivalent electrical conductivity of the simulator is carried out using an eddy current device configured and verified using an exemplary set of uniform measures of electronic conductivity.

When setting up or calibrating with the help of a simulator, the primary transducer 4 of the eddy-current device standers to the simulator from the side of layers of smaller thickness. After that, using the adjustment knobs of the nov rivedor, set on its first scale the conductivity value, which is indicated on the nmitator.

Claims (2)

1.Naumov N.M. et al. Methods of measuring specific electrical conductivity with the help of measuring tin NE methods for comparing samples with standards. "Technology of light alloys, № 4, 1967. 2. USSR author's certificate number 526817, cl. G 01R 27/86, 1974.