Russian Journal of Nondestructive Testing. Vol. 54, No. 3, Pages 213-221, 2018

V. V. Davydov^a^, ^b^, *, N. S. Myazin^a, S. E. Logunov^a, and V. B. Fadeenko^a
Translated by V. Potapchouck

^aPeter the Great St. Petersburg Polytechnic University, St. Petersburg, 195251 Russia

^bThe Bonch-Bruevich Saint-Petersburg State University of Telecommunications, St. Petersburg, 193232 Russia

Abstract—A new Doppler-effect–based method for nondestructive testing of the condition of the inner walls of pipelines using a flowing fluid is considered. An optical method has been used to reveal specific features in the structure of the fluid-medium flow in a circular-section pipeline. A new technique that makes use of laser radiation scattered on flowing-fluid particles has been proposed for determining the coordinates of a flawed zone on the inner pipeline wall. The technique makes it possible to determine the zone coordinates along the length and diameter of the pipeline.

Keywords: flaw, laser radiation, fluid flow rate, fluid-medium flow, Doppler frequency shift, spectrum, signal-to-noise ratio

A Contactless Method for Testing Inner Walls of Pipelines