Research of Scanning Acoustic Microscope Thickness Measurement Method for Zirconium Alloy Multilayered Composite Material

The zirconium cladding material is a kind of multilayer structure. The outer layer is zirconium alloy cladding and the middle layer is some kind of metal powder rolling products. The thickness of the zirconium cladding is about 0.3mm to 0.6mm. To satisfy the quality control requirement of the rolling technology, accurate thickness of the compound layer needs to be measured. The traditional ultrasonic thickness measurement method can not meet the requirements because of its poor sensitivity and resolution ratio. In this paper, SAM thickness measurement technology is used to measure the thickness of the zirconium cladding, and the thickness mechanism is analyzed theoretically. The experimental verification is carried out. The experiment shows that SAM is available for the thickness measurement of the cladding with thickness of 0.3mm to 0.6mm.