Ye Sheng-hua

A Novel Laser Multidirection Network Measurement System

wMPS (workspace Measurement and Positioning System) is a new network measurement system based on multi-directional positioning using rotating laser beams. With the features of automation, high speed, high precision and wide measuring rang, it has great prospect in advanced equipment manufacturing projects, especially in the assembly and positioning of large parts. The system principle was described and error propagation was analyzed with error sources in detail. An actual measuring network was set up utiLizing three transmitters. The experiment results show that the overall accuracy of the system can be achieved within 0.1mm at the range of 10m.

Research on image preprocessing techniques for real-time radiography inspection

In this paper, the image preprocessing techniques are studied in detail combining with the characteristics of real-time radiography. In view of the characteristics of radiant attenuation, an image processing method is presented to make the relationship between image gray scale and workpiece thickness linear. In order to get better image contrast, an image stretching method based on fuzzy transformation is designed by which the image is effectively enhanced. Meanwhile, another algorithm is also proposed to avoid the complexity of above method. Moreover, the study is carried out to the influence of radiation source focus, which is a very important factor to image quality in real-time radiography. The mathematical model is established for the influence of radiation source focus on real-time radiography image. On the basis of this model, the corresponding algorithm is proposed to eliminate its influence. All these algorithms are studied in detail with corresponding results presented.