RU1775694C - Method of calibration testing of electromagnetic non-destructive inspection - and - measurement apparatuses - Google Patents

Abstract

The invention relates to instrumentation and metrology and can be used in the operation of non-destructive testing devices. The purpose of the invention is to improve the accuracy of verification. This is achieved by separately checking the primary converter and the information processing unit. The primary transducer is connected to standard equipment for measuring the active, inductive resistances and mutual induction coefficient of all windings, and according to these s / d values the correspondence of the primary transducer with the passport data. To verify the information processing unit, a primary transducer - metal model is used, with which you can simulate with high stability the electromagnetic characteristics of the primary transducer-metal system. The model is connected to the input of the information processing unit, which is estimated by changes in the readings of the indicator of the block under various conditions of the model, 2 il. next to

Description

The invention relates to instrumentation and metrology and can be used in the operation of non-destructive testing devices.

The purpose of the invention is to increase the accuracy of verification.

The verification of an electron of a threading means, for example, a mechanical strain gauge having a throttle primary converter on a 2-pole U-shaped core, is carried out in the following order.

The information processing unit is separated from the primary converter.

To test the primary converter, an ohmmeter is used to measure the resistance of the DC winding, AC MOS, s

which measure inductance and quality factor,

Measurements are carried out in air.

If the measured values correspond to the passport data, then the primary converter is in good condition and can be approved for use.

To check the information processing unit at its input, they include a primary converter –controlled model (metal), consisting of three air inductances and two highly stable resistors,

For each of the combinations of active and inductive reactance of the model, the readings of the indicator of the information processing unit are recorded. If these readings correspond to the passport data, then the unit

Joint venture

The information processing is operational and may be allowed to operate. Converters installed on the control object can be represented by parallel (a) or sequential (b) equivalent circuits: parametric (Fig. 1), transformer (Fig. 2), where 1. 2 are the active resistances of the magnetizing windings of the converters;

3 - reduced to the magnetizing winding of the active resistance of the measuring winding of the Converter;

4; 5 - inductance of scattering of magnetizing windings;

6- the scattering inductance of the measuring winding is reduced to a magnetizing winding;

7 - inductance of the converter, due to the magnetic resistance for the magnetic flux, which is closed in the control object;

8- resistance to losses on the magnetization reversal of the test object and the magnetic core of the converter (if any).

For a specific means of non-destructive testing, when developing or configuring, a substitution circuit is selected corresponding to the transducer used. Elements 7 and 8 can be implemented using standard inductance and resistance stores. By connecting the assembled circuit to the instrument under test instead of the primary converter and changing the values of 8 and 7, you can simulate

to take into account all sorts of options for the state of the monitoring object located in the working area of the converter; therefore, it is called the primary pre-metal-metal model,

The primary converter itself is verified separately from the instrument and the monitoring object. The deviation of the determined parameters of the converter (active, inductive resistances and mutual induction coefficients) from the nominal ones (indicated in the passport data) determines its suitability for use.

Claims (1)

The claims A method of checking electromagnetic means of non-destructive testing and measurement, which consists in determining the metrological characteristics of the means on models of the controlled object, characterized in that, in order to increase the accuracy of verification, active, inductive resistances and mutual induction coefficients of all windings of the primary transducer disconnected from the means are determined, instead of the transducer, the primary transducer - control object is connected to the verified means of control by changing the values of the inductance and resistance of which simulate a change in the electromagnetic parameters of the metal and, according to the indications of the verified means, establish its applicability NOSTA to application, 0 (rig-1 and &. 6 3 -0 J-0 FIG. 2