METHOD FOR RAIL BASE ULTRASONIC CONTROL Russian patent published in 2011 - IPC G01N29/04 

FIELD: physics.

SUBSTANCE: rail base ultrasonic control is performed by way of the control zone scanning with an angle-beam probe relocated within the rail plane, receipt and registration of echo-signals using the said prove; one additionally scans the control area and receives echo-signals with a second marched angle-beam probe relocated within the rolling plane; the both probes acoustic axes are oriented along the rail longitudinal axis but in opposite directions; one registers echo-signals with the second probe, shifts the defectogram of one probe relative to that of the other probe by a distance equal to that between the probes acoustic axes within the control zone at one and the same moment of time corrected by the difference of the transducers delay times; by temporal coincidence of echo-signals on the shifted defectograms one determines presence of a crack.

EFFECT: provision for a possibility of more reliable detection of crosswise cracks.