Improved thickness measurement on rough surfaces by using guided wave cut-off frequency

Substantial variability is seen when thickness measurements using conventional ultrasonic time of flight are carried out on rough surfaces; this makes it difficult to estimate corrosion rates the mechanism leads surface roughness. It has been shown that guided wave cut-off frequencies (through resonance frequencies) can be done at much lower than gauging for same minimum resolution. The frequency less susceptible variations caused by roughness and so will give more consistent reliable results in cases where increased Measurements were four plates with different On a plate root mean square (rms) 0.3 mm, estimates followed trend predicted from geometry probe footprint, whereas higher reported literature deviated an rms 0.1 mm. cut-offcut-off transduction system as used large area monitoring possible combine small single unit. Frequent enable wall obtained tracked time, low susceptibility means accurate obtained.