| 摘要 |
A method for detecting flaws in a railhead, which railhead ( 1 ) is provided with a top side (T), a bottom side (B) and longitudinal sides (S) extending between that top side (T) and bottom side (B), wherein at least one ultrasonic first signal ( 10 ) is transmitted into the railhead ( 1 ) via said head top side (T) and traverses such a transmission path ( 9 ) that:-the signal ( 10 ) is only once reflected by the railhead bottom side (B), and not by a railhead longitudinal side (S);-the signal ( 10 ) reaches at least one substantially central railhead part (C); and-the signal ( 10 ) can exit the railhead ( 1 ) via the head top side (T); wherein first ultrasonic signals exiting the head top side (T) are detected, wherein the transmission path ( 9 ) of the at least first signal ( 10 ) extends in a virtual transmission plane, which transmission plane extends substantially transverse to a longitudinal direction (L) of the rail. In addition, the invention provides an apparatus for detecting flaws in a railhead. The invention further relates to a positioning method.
|
