管道腐蚀检测：超声波检测与腐蚀区域映射

The remaining thickness is captured through on-site measurements using ILI (in-line inspection) tools, such as ultrasonic testing or automated pigging devices (internal measurement devices in the pipeline). Ultrasonic tools have depth detection capabilities of approximately ±0.3 to ±0.6 mm, providing sufficient resolution to create an accurate geometric representation of the corrosion areas, including a matrix of corrosion depth (unit: % wall thickness) and their respective circumferential and longitudinal positions (unit: °) in the pipeline.