06:08 Oct-01-2007 Re: multi echo Multi-echo measurement, more commonly known as echo-to-echo measurement, is a technique that is available on many ultrasonic thickness gages and flaw detectors, used to measure the thickness of a metal substrate beneath a non-metallic coating without including the coating thickness. In that sort of situation (like thick paint over a steel pipe), there will be multiple backwall echoes from the metal but only a single echo from the coating. The time interval between any two of the metal backwall echoes represents one round trip of the sound wave in the metal, so by measuring that interval the instrument measures the metal thickness only.
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