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Rapid Large Area Inspection from a Single Sensor Position: A Guided Shear Wave Phased Array Scan

Being a student and professor of ultrasonics for over 40 years, this author can remember his initial passionate behavior starting 30 years ago with respect to the subject of ultrasonic guided waves. It became possible to inspect large areas of a structure from a single sensor position. Wow! Amazing! Some simple scanning, however, was often necessary. Ultrasonic guided waves did not just replace bulk wave ultrasonics in many inspections, but could now solve some problems that couldn’t even be solved in earlier years. At that time, however, this author envisioned someday that someone would be able to inspect a large area of a structure by simply touching the structure at a single position, and despite having sections hidden or covered with water for example, still being able to carry out a reliable inspection. The guided wave phased array (GWPA) scan discussed in this feature article can indeed inspect large areas of a structure from a single probe position. Obviously several touches are benefi-cial from both a nondestructive testing (NDT) and structural health monitoring (SHM) point of view, but further growth and development is on the horizon. Nondestructive testing and structural health monitoring of large area plate and shell structures is thus an area of opportunity due to the time consuming and costly nature of such inspections. The long-range inspection capability of ultrasonic guided waves makes them excellent candi-dates for addressing this problem. A patent-pending shear ring phased array technology has been developed that utilizes a range of specialized piezo-electric actuators in conjunction with a phased array electronics platform to facilitate rapid screening of large areas of plates and shells. Examples of large-area NDT include the hulls of ships and submersibles, aircraft fuselages and wings, pressure vessels, and storage containers, among others. Traditional ultra-sonic phased array technology is a well-known and accepted inspection technology that introduced distinct advantages in the realm of bulk wave ultra-sonics. Guided wave phased array technology now becomes the next logical step in the realm of guided wave ultrasonics.


Borigo, Cody J., Steven E. Owens, and Joseph L. Rose,“Piezoelectric Shear Rings for Omnidirectional Shear Horizontal Guided Wave Excitation and Sensing,” US Patent Application No. 14878595, filed 8 October 2015, and published 21 April 2016.

Croxford, Anthony J., Jochen Moll, Paul D. Wilcox, Jennifer E. Michaels, “Efficient Temperature Compensation Strategies for Guided Wave Structural Health Monitoring,” Ultrasonics, Vol. 50, No. 4, 2010, pp. 517–528.

Giurgiutiu, Victor and JingJing Bao, “Embedded-Ultrasonics Structural Radar for In-Situ Structural Health Monitoring of Thin-Wall Structures,” Structural Health Monitoring, Vol. 3, No. 2, 2004, pp. 121–140.

Li, J. and J.L. Rose,“Implementing Guided Wave Mode Control by Use of a Phased Transducer Array,” IEEE Transac-tions on Ultrasonics, Ferroelectronics, and Frequency Control, Vol. 48, No. 3, 2001, pp. 761–768.

Philtron, J. H., and J.L. Rose, “Mode Perturbation Method for Optimal Guided Wave Mode and Frequency Selection,” Ultrasonics, Vol. 54, No. 7, 2014, pp. 1817–1824.

Rose, J.L., Ultrasonic Guided Waves in Solid Media, Cambridge University Press, Cambridge, United Kingdom. 2014.

Rose, J.L., Z. Sun, P.J. Mudge, and M.J. Avioli, “Guided Wave Flexural Mode Tuning and Focusing for Pipe Testing,” Mate-rials Evaluation, Vol. 61, No. 2, 2003, pp. 162–167.

Wilcox, P., Lowe, M., and Cawley, P., “Omnidirectional Guided Wave Inspection of Large Metallic Plate Structures Using an EMAT Array,” IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 52, No. 4, 2005, pp. 653–665.

Yan, F. and J.L. Rose, “Guided Wave Phased Array Beam Steering in Composite Plates,” Proc. SPIE 6532, Health Monitoring of Structures and Biological Systems 2007, 65320G, 11 April 2007, doi: 10.1117/12.716109.

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