METHOD FOR MEASURING DEFORMATIONS OF ITEMS FROM NONMAGNETIC MATERIALS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2014 - IPC G01B7/16 

FIELD: instrumentation.

SUBSTANCE: invention refers to instrumentation and can be used to measure deformations of nonmagnetic materials. Deformation measurement method for nonmagnetic items implies that on the surface of an item or inside it permanent dipole sources of magnetic field based on, for example, magnets from the alloy neodymium-iron-boron, are installed, at least two magnets not located in the same point are used to determine the parameters of linear (along the straight line) deformation, at least three magnets not located along the same straight line are required to determine the parameters of plane deformation, at least four magnets not located in the same plane are used to determine the parameters of volume deformation. At the surface of the examined item opposite each source a system of sensors is installed, the sensors allow for the measurement of 1, 2, 3 components of vector of magnetic field induction in several points concentrated in relatively small region of space if compared to the distance to the field sources, or one-, two- or three axial sensor with 3D-positioning system is used as the system of sensors, the signals from the sensors are amplified and converted into digital ones, numeric measurement data: coordinates of measurement points and values of components of magnetic field induction vectors in them in a laboratory coordinate system are processed by a computer programme, basing on the obtained data an inverse problem is solved for the system of weakly interacting magnets and their position in the laboratory coordinate system is determined as well as the vectors of magnetic moments in the laboratory coordinate system before and after the item deformation and by comparing the said solutions the deformation parameters are calculated. A plant for implementing the said method is also described.

EFFECT: possibility to measure linear (along the straight line), plane (in a plane) and volume (in space) deformation of items made from nonmagnetic materials.

5 cl, 1 dwg, 3 tbl