What is meant by "depth calibration" in PAUT inspections?

Depth calibration in Phased Array Ultrasonic Testing (PAUT) refers to the process of adjusting the system to ensure that the depths of detected defects are displayed accurately on the inspection results. This process is crucial because ultrasonic testing relies on the time it takes for sound waves to travel through a material and reflect back after hitting a flaw. Accurate depth representation allows inspectors to assess the severity and location of defects effectively, which is key for safety and structural integrity evaluations.

By calibrating the depth, technicians can confirm that the measurements correspond with the actual positions of defects within the material. This ensures reliability in diagnostic assessments. Other options, while important in their own right (such as speed of sound adjustments for different materials), do not directly relate to the accuracy of defect depth representation that depth calibration specifically addresses.