Calibration Method Study of Ultrasonic Thickness Gauge

Since the invention of ultrasonic examination technology, the ultrasonic thickness gauge has been widely used and playing an important role in many field, such as service inspection of pipeline and pressure vessel, in the quality control of massive construction project, the dimension measurement of complicated-shaped mechanical components and so on. With the rapid growing of our country economy and the development of technology, the quality control and examination become more and more important. Therefore, the application of this traditional technique becomes more popular in now days. To take full advantage of the high accuracy and easy operation, as well as satisfying various requirement of application, this paper is trying to show the concept of “zero point calibration” which is very important to the measurement accuracy of ultrasonic thickness gauge. the most popular calibration methods used in the ultrasonic thickness gauge will be described and compared.