This paper introduced the methods of non-destructive inspection of boilers,which including radiographic and ultrasonic examination,and the methods to choose the technological parameters of non-destructive inspection are mainly introduced.

The structure, working principle, measuring circuit and frequency characteristics of contact potential difference nondestructive testing equipment using fixed probe am intro- duced.

Optical nondestructive testing as a kind of the nondestructive testing techniques is introduced and compared with the traditional nondestructive testing techniques like RT, UT and ET, et al.

The background and the development of Synthetic Aperture Radar(SAR)are reviewed with the discussion on the imaging principle,imaging algorithm and high resolution in direction and special emphasis on application in Nondestructive Testing (NDT).

Non-destructive test (NDT) is the most-often-used method in the weld inspection for boilers and pressure vessels; how to properly realize and implement NDT is of great importance to quality control of products.

This paper presents a general introduction of overseas industrial radiographic films used in NDT and produced by world renowned photographic manufacturers, e.