Fault detection in small diameter pipes using ultrasonic guided wave technology

Rahul M. Sabhnani; Victor Humphrey; Bahareh Zaghari; Mohammed Moshrefi-Torbati

doi:10.1117/12.2085494

27 March 2015 Fault detection in small diameter pipes using ultrasonic guided wave technology

Rahul M. Sabhnani, Victor Humphrey, Bahareh Zaghari, Mohammed Moshrefi-Torbati

Proceedings Volume 9435, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2015; 94353F (2015) https://doi.org/10.1117/12.2085494
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2015, San Diego, California, United States

Abstract

Ultrasonic guided wave technology is one of the more recent developments in the field of non-destructive evaluation. In contrast to conventional ultrasonic, this technology requires exposing only the areas where the transducers will be placed, hence requiring minimal insulation removal and excavation for buried pipes. This paper discusses how this technology can be used to detect defects in pipes under different conditions. Here the experiments were performed on small diameter pipes (<5 cm diameter); which were bare pipe, buried pipe and bitumen coated pipe. The results were gathered to see the effectiveness of this technology in detecting defects. Experiments were conducted using two dry coupled piezoelectric transducers, where one of them transmitted guided waves along the pipe and the other received them. The transducers produced tangential displacement, thereby generating the fundamental torsional mode T(0,1). In order to assess whether having multiple transducers has any effect on the resultant waveform, the receiving transducer was rotated around the circumference of the pipe.

Citation Download Citation

Rahul M. Sabhnani, Victor Humphrey, Bahareh Zaghari, and Mohammed Moshrefi-Torbati "Fault detection in small diameter pipes using ultrasonic guided wave technology", Proc. SPIE 9435, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2015, 94353F (27 March 2015); https://doi.org/10.1117/12.2085494

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KEYWORDS

Waveguides

Transducers

Ultrasonics

Defect detection

Coating

Wave propagation

Signal attenuation

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