Akash Koiri
Engineering
July 2025
Ultrasonic C-scan devices are central non-destructive testing (NDT) equipment that are commonly used in industrial, automotive and aerospace industries to identify internal flaws and carry out accurate dimensional analysis. This paper was set out to improve ultrasonic C-scan systems to achieve better metrological accuracy and reliability in the industrial case. Contact and immersion ultrasonics were performed comparatively on ASTM reference blocks through rigorous calibration against both IS 4904:2006 and ISO 2400:2012. A bespoke automated immersion C-scan was designed with servo controlled scanning capability, real-time echo acquisition and highly visualized data. The outcomes showed higher accuracy of the immersion technique, where the uncertainties were lower (thickness: 0.015 mm, attenuation: 0.38 dB/mm) than the contact method. The system managed to identify artificial flaws and demonstrate an overall uncertainty of 0.070mm, which confirms its industrial applicability. The present work develops the best ultrasonic C-scan techniques, which present useful instructions on high-precision non-destructive testing and quality assurance in sensitive engineering fields
96- 113
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