METHOD FOR MONITORING ELECTROCONDUCTIVITY CHANGES OF NON-MAGNETIC METAL INNER LAYERS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2016 - IPC G01N27/72 

FIELD: control equipment.

SUBSTANCE: invention can be used for control of electrical conductivity and correlating with it temperature value of sheet inner layers, for example, made of refined copper - copper crystallizer case by measuring electrical conductivity of copper inner layers. According to invention, a method for monitoring electroconductivity changes of non-magnetic metal inner layers consists in using false eddy-current converter, at the exciting coil of which current created by generator circulates, and its measuring coil signal is processed in the processing unit to output of which electroconductivity indicator is connected, at that, periodic pulsed current circulates in exciting coil in the form of meander with period, selected in a way, that during half period electromagnetic transient processes are being ended, the maximum value of Δs_Max differential in relation to an object with constant value of electroconductivity of magnetic flux is determined and the value of time interval t_Max of reaching said maximum, by these values using calibration curves on the plane with axes Δs_Max-t_Max, the value of electroconductivity change and coordinates of an area are measured, where there are these changes, wherein the calibration curves on the plane of state are pre-builded by modelling for the assumed laws of electrical conductivity variation, and they are stored in memory of the processing unit. Proposed method and device allow to determine electrical conductivity inside the metal sheet and to determine coordinates of electrical conductivity change.

EFFECT: invention enables a possibility of control of parameters during industrial production - melting of the metal and process of its cooling, possibility of determining electrical conductivity (temperature) in the area of the metal removed layers (i/e walls of crystallizer contacting with liquid metal), determination of electrical conductivity change area, i/e distribution of electrical conductivity (temperature) along the metal wall (crystallizer case).

2 cl, 6 dwg