Guided Wave Testing Technology Overview

Guided Ultrasonics Limited (GUL) has been at the forefront of long-range guided wave inspection technology for pipes for the past 20 years (from the time it was pioneered at the Imperial College NDT Lab).

Guided Wave Testing (GWT) is a non-destructive testing (NDT) method creates a resonance that fills the entire cross section of the structure with energy; any change in the cross section disturbs this resonance and causes a reflection that is usually much larger than would be expected from the simple change in cross section. The Wavemaker system analyses these reflections to evaluate the position and characteristics of the source of the reflection.

Large sections of pipe can be quickly screened with 100 percent coverage to determine what locations are showing changes. More detailed inspections (either with guided waves or with complementary methods) can then be concentrated on critical locations. This method provides a cost-effective means of ensuring that representative measurements are made on a line. The fact that guided waves can propagate tens of meters means that you can often inspect areas that are very costly to inspect using other methods (for example, the buried sections of road crossings or insulated pipelines).

Guided wave inspections can be either performed as single collections or can be easily used in a monitoring mode.

Guided Wave Methodologies