Abstract
With an increasing amount of work on residual thickness measurements of various metal products (petrochemical industry products, marine and bridge structures, transport infrastructure objects, etc.) the task of improving measurement performance is getting increasingly urgent. While measuring the residual wall thickness Hmet of coated metal products with the traditional ultrasonic methods, for example, probe-echo, a significant portion of time is spent to scrape a protective dielectric coating (most often paint) from the testing point and then to restore the coating after the measurements. In recent years the ultrasonic methods, which do not require the coating to be removed for measuring, are intensively developed. The optimal methods are the following: Echo-Echo, different Probe-Echo Coating (including the TopCOAT) and combined.
 The article describes in detail the physical basis of the methods, block diagrams of two - and four-element double crystal transducers, time charts and algorithms for Hmet computing, which together enable the coating thickness value to be eliminated from the measurement results. The analysis of every method’s merits and demerits and the restrictions on its usage are given. The article also shows the ways to improve parameters of the equipment used for coated products testing as well as measures to increase the reliability of Hmet measurement results.
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