Uncertainty Evaluation of Indication Error of Ultrasonic Coating Thickness Measurement

Ultrasonic Thickness Measurement was widely used in processing and testing of parts for quality control. The uncertainty evaluation was significant in the indication Error. The uncertainty evaluation of indication error of ultrasonic thickness measurement was undertaken. The results show that the best estimate of Indication Error of the measurement was 19.8 μm and the uncertainty was 21.9 μm. Furthermore, the uncertainty of instrumental precision makes the greatest contribution to the uncertainty evaluation.