METHOD OF DETERMINING SIGNAL FROM PIPE WALL ACCORDING TO POWER LINES STATISTICS PID CD DATA Russian patent published in 2019 - IPC G01N23/04 

FIELD: defectoscopy.

SUBSTANCE: use to detect pipeline defects by ultrasonic intratubular defect detector data. Summary of invention consists in the fact that for analysis of ultrasonic signals reflected from the wall of the pipeline, generating a frequency map of responses of ultrasonic signals reflected from the internal wall of the pipeline, excluding noise component of ultrasonic signal reflected from internal wall of pipeline, setting of threshold values of ultrasonic signal reflected from internal wall of pipeline, determining pipeline regions with low frequency of ultrasonic signals reflected from the internal wall of the pipeline or with absence of ultrasonic signals reflected from the internal wall of the pipeline, smoothing the prepared reflected from the internal wall of the pipeline of ultrasonic signals, using a moving average filter in order to reduce the level and frequency of emissions of ultrasonic signals reflected from the inner wall of the pipeline with a low signal / noise ratio, generating power lines of ultrasonic signals reflected from the inner wall of the pipeline; the obtained power lines of the ultrasonic signals reflected from the inner wall of the pipeline are considered to be the zone of beginning of the inner surface of the pipeline.

EFFECT: high accuracy of determining defects located inside a wall of a pipeline, such as longitudinal and transverse stress-corrosion cracks of walls of a pipeline, including in longitudinal and transverse welds.

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