SU1486903A1 - Magnetoelastic matrix meter of mechanical stresses - Google Patents

Description

The invention relates to non-destructive testing of materials and products and can be used to register mechanical stresses I

The invention relates to non-destructive testing of materials of products and can be used to register mechanical stresses in local areas of materials.

The purpose of the invention is to increase the reliability of measurements due to the introduction of the possibility of local measurements together with integrated ones.

Figure 1 shows the design of the device; in Fig.2 - ⁴ construction surface of the eddy current transducer.

The device contains a ferromagnetic substrate 1, the matrix 2 and 3 overlay 2

on local sites of materials. The purpose of the invention is to increase the reliability of measurements due to the possibility of local measurements together with integral. Matrix overhead eddy current transducers are installed respectively on the reference and controlled products. By switching in series, switches form U-shaped pairs of converters, the magnetic flux of which closes, respectively, through two core magnetic cores, a ferromagnetic substrate and a controlled or reference product. By forming various U-shaped pairs of converters and switching all elements of the matrix. after comparing with the reference product, it is concluded that the quality of the product under test. 2 Il.

with

GOVERNMENTAL eddy current transducer mounted on a ferromagnetic substrate 1. The dimensions of the matrices 2 and 3 are equal and are denoted respectively Ν = nx u and ν '= η'χη ^ί.

The device also contains subsequently *

I

alternately-connected alternating current source 4 and switch 5 nd serially connected switch 6 and block 7 for processing and measuring output signals.

Each transducer (figure 2)

contains a magnetic core 8, on which the measuring winding is placed

9 and excitation winding 10, outputs

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3

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four

which are connected respectively to the switches 6 and 5. In addition, the converter contains an annular screen 11 located above the measuring winding 9 and the excitation winding 10.

The device works as follows.

The matrix 3 of eddy current transducers is installed on the material under study 32, the second matrix 2 of eddy current transducers is closed by a medium or material accepted as a reference (not shown). Through the switch 5, the excitation windings 10 are connected in series to the AC source 8 in such a way that from two adjacent overhead eddy current transducers 2, ί, k and 2, ΐ ± 1, K + 1 U-shaped pairs are formed, the magnetic circuit of which consists of two core magnetic cores 8, ί, k and 8.Ϊ + 1, k ± 1, of the ferromagnetic section under ozhki 1 and the controlled or reference product. Information about the magnetic flux thus obtained is read out by the measuring windings 9, ί, k and 9, ϋΐ, k ± 1 and through the switch 6 enters the processing and measurement unit 7 of the output signals.

By successive commutation of both matrices 2 and 3, the distribution of the multiple fluxes of magnetic induction in the controlled material is recorded, which is compared with the distribution of similar flows in the reference material, on the basis of which it is concluded that the properties of the controlled material.

Claims (1)

Claim A magnetoelastic matrix measuring transducer of mechanical stresses containing a matrix of superimposed eddy current transducers with measuring windings and excitation windings and a ferromagnetic substrate on which superimposed eddy current transducers are fixed, in order to increase the reliability of measurements, it is equipped with a second matrix of superimposed eddy current transducers, / placed on the other side of the ferromagnetic substrate, and two switches connected respectively to the measuring eddy current transducer configured with rod yoke and the annular conductive screen lnym windings and excitation windings overhead eddy current probes both matrices, and each invoice. 1486903 0 1486903 Wow. φυε.2