锆合金管坯在检验时，需要对管坯尺寸进行测量。介绍了一种管材超声自动探伤系统中的激光测外径和超声测厚的尺寸测量方法。通过某规格锆合金管坯的应用测试试验，表明该系统外径测量误差不超过±0.008 mm，壁厚测量误差不超过±0.02 mm，内径测量误差不超过±0.025 mm，能够满足锆合金管材生产需要。

It is necessary to measure the size of the zirconium alloy pipe when the pipe is tested. In this paper, a measuring method for the diameter of laser and ultrasonic thickness is introduced in the ultrasonic automatic flaw detection system for pipes. Through the application and test of a zirconium alloy pipe, the error of the outer diameter measurement is <±0.008 mm, the wall thickness measurement error is <±0.02 mm, and the inner diameter measurement error is <±0.025 mm, which is able to meet the requirement of pipe production.