Process and device for the continuous nondestructive control of

Details Process and device for the continuous nondestructive control of Process and device for the continuous nondestructive control of

1995-06-02

1996-11-12

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73634, G01N 2904

Patent

active

055742246

ABSTRACT:
A continuous nondestructive process for controlling the rails on a railway line by ultrasounds is carried out by the emission of ultrasounds at successively different points along the rail which are spaced apart by a measured value. For each echo, the acoustic distance between the point of emission and the point of reflection of the beam of ultrasounds is determined, and then a bidirectional map of the echoes is established by correlation. Finally, this echo map is compared to a mask having a window, of which the shape, the orientation and the dimensions are determined by the characteristic features of the rail to be examined and by the type of defect looked for, only those echoes which appear in this window being then taken into consideration.

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patent: 3592052 (1971-07-01), Di Giacomo et al.
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patent: 4689995 (1987-09-01), Turbe
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patent: 5275051 (1994-01-01), De Beer
"Ultrasonic Flaw Evaluation in Rails With Assistance of Programmable Calculator"; Rogovsky, Alexander and Thomas, Jerrell; Material Evaluation; 1981.

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