Investigation of Goubau Wave Propagation on Large Pipes for Sensing Applications

We examine the application of guided waves on a single conductor (Goubau waves) for sensing. In particular, the use of such waves to remotely interrogate surface acoustic wave (SAW) sensors mounted on large-radius conductors (pipes) is considered. Experimental results using a small-radius (0.0032 m) conductor at 435 MHz are reported. The applicability of published theory to conductors of large radius is examined. Finite element simulations are then used to study the propagation and launching of Goubau waves on steel conductors up to 0.254 m in radius. Simulations show that waves can be launched and received, although energy loss into radiating waves is a problem with current launcher designs.

Automated summary

This study examines the application of guided waves (Goubau waves) on a single conductor for sensing. It focuses on the use of these waves to remotely interrogate surface acoustic wave (SAW) sensors mounted on large-radius conductors (pipes). Experimental results using a small-radius conductor at 435 MHz are presented, and the applicability of published theory to conductors of large radius is explored. Finite element simulations are then utilized to study the propagation and launching of Goubau waves on steel conductors up to 0.254 m in radius. The simulations indicate that waves can be launched and received, but current launcher designs suffer from energy loss into radiating waves.