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Benefits of the Multiple-echo Contact Technique for Ultrasonic Thickness Testing

This paper presents multiple-echo contact techniques, which can be used to increase the accuracy and repeatability of thickness measurements in field conditions. The multiple-echo contact technique is not as susceptible to error from surface conditions or temperature fluctuations as first-echo contact techniques.

References
ASME, ASME BPVC Section V – Nondestructive Examination, American Society of Mechanical Engineers, New York, New York, 2010. ASNT, Nondestructive Testing Handbook: Ultrasonic Testing, Vol. 7, third ed., American Society for Nondestructive Testing, Columbus, Ohio, 2007. ASTM, ASTM E797/E797M-10, Standard Practice for Measuring Thickness by Manual Ultrasonic Pulse-Echo Contact Method, ASTM International, West Conshohocken, Pennsylvania, 2010.
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