چكيده به لاتين
The presence of defects such as cracks in gas turbine blades causes irreparable damages. These defects can make a turbine completely out of service and cost a lot of money. Therefore, it is very important to control the blades in order to identify cracks and other defects in them. One of the methods of identifying and diagnosing problems in vanes, which has received attention in recent years, is the use of thermography. In this method, surface defects and even internal and subsurface defects can be detected using infrared cameras, cameras that work in a specific range of the electromagnetic wave spectrum (0.8-14 nm). In this research, the crack in the root of the turbine blade has been investigated using the non-destructive method of thermography. Also, the image processing method has been used to integrate the images obtained from the infrared camera in order to observe the vane accurately. First, using a thermography test and using an infrared camera, a video has been taken from the time of heating the blade to the moment it cools down. In the next step, several images with higher resolution were extracted and a better quality image was selected from among those images. Then, a visible photo of the vane was taken using a video camera, and using the registration method, the visible photo and the image obtained from the thermography method were placed on top of each other and combined with the help of four points. . Finally, by using the image fusion technique and wavelet transformation in MATLAB software, the resulting image was integrated and the crack in the root of the turbine blade was observed, identified and investigated.
