METHOD FOR DETERMINING THICKNESS OF TWO-LAYER MATERIALS AND THEIR CONSTITUENT LAYERS BY MEANS OF ELASTIC WAVE PULSES INTRODUCED INTO CONTROL OBJECT AND ULTRASONIC CONVERTER FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC G01B17/02 

FIELD: measuring equipment.

SUBSTANCE: determination of the thickness of two-layer materials and their constituent layers by means of elastic wave pulses introduced into the control object is carried out by recording and analysing the arrival time of the acoustic pulses reflected from the surfaces of the control object and the boundaries of its layers. The thickness of the control object and its layers is determined by means of a combination of elastic body waves of different types, for which purpose both longitudinal and transverse waves are introduced into the same section of the control object. The thickness of the control object and its constituent layers is determined by recording and analyzing the arrival time of pulses reflected from the input surface and/or a set of pulses, resulting from both longitudinal and transverse waves propagating in the control object and interacting with the boundaries of its layers. The analysis is performed by solving simultaneous equations linking the determined parameters to known and measured quantities. The type of the solved simultaneous equations is determined by the specific configuration of the measuring system and the required measurement accuracy.

EFFECT: expansion of the range of material combinations of controlled bimetallic sheets, expansion of the possibilities for automation of the control process, and removal of restrictions on the nonparallelism of the interface of the base metal cladding layer of the ultrasonic input surface.

5 cl, 6 dwg