METHOD OF ULTRASONIC MONITORING OF PIPELINE WALL THICKNESS Russian patent published in 2019 - IPC G01N29/04 

FIELD: defectoscopy.

SUBSTANCE: use for ultrasound control of pipeline wall thickness. Summary of invention consists in the fact that when moving along the pipeline of the diagnostic device, periodically pulses of US oscillations are excited with tangent to the surface of the pipeline by oscillating forces at the points of acoustic contacts of the receiving-emitting elements, in the selected time interval, the US-oscillations of the pipeline walls are taken from the same points of realization and by means of combined processing of the accepted implementations, the pipeline wall thickness and the propagation speed of transverse ultrasound waves in it are determined. In processing, the measurements taken at identical distances (bases) from vibration excitation points are averaged, the obtained averaged implementations are gated at certain intervals depending on the value of the base, at which the implementations making each averaged implementation were accepted. Then scale of propagation of ultrasonic pulses from the point of excitation to the bottom surface of the wall and conversion to the point of reception is converted to values of time of flight of pulses of double distance between surfaces of the wall, averaged implementations are summed on the transformed time scale, autocorrelation function is calculated from the obtained summary implementation and a time interval between the main maximum and the largest of the side maxima is determined in it. Finally, the thickness is calculated by multiplying half of this interval by the velocity of transverse waves in the wall of the pipeline, and speed is determined by dividing the difference between the values of two bases by the difference in time of propagation of transverse wave pulses along these bases.

EFFECT: possibility of continuous measurement of current thickness of pipeline wall during its scanning, as well as possibility of continuous measurement of current speed of ultrasonic waves in pipeline wall.

5 cl, 5 dwg