Signal acquisition and scale calibration for beam power density distribution of electron beam welding

4th International Conference on Advanced Composite Materials and Manufacturing Engineering 2017

材料科学;化学

Peng, Yong^1 ; Li, Hongqiang^1 ; Shen, Chunlong^2 ; Guo, Shun^1 ; Zhou, Qi^1 ; Wang, Kehong^1

School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing

210094, China^1

College of Marine and Electromechanical Engineering, Taizhou University, Taizhou

215300, China^2

关键词: Beam cross section;    Deflection control;    External-clock sources;    One dimensional signal;    Phase relationships;    Power density distributions;    Signal acquisitions;    Signal segmentation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/207/1/012099/pdf
DOI  :  10.1088/1757-899X/207/1/012099

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The power density distribution of electron beam welding (EBW) is a key factor to reflect the beam quality. The beam quality test system was designed for the actual beam power density distribution of high-voltage EBW. After the analysis of characteristics and phase relationship between the deflection control signal and the acquisition signal, the Post-Trigger mode was proposed for the signal acquisition meanwhile the same external clock source was shared by the control signal and the sampling clock. The power density distribution of beam cross-section was reconstructed using one-dimensional signal that was processed by median filtering, twice signal segmentation and spatial scale calibration. The diameter of beam cross-section was defined by amplitude method and integral method respectively. The measured diameter of integral definition is bigger than that of amplitude definition, but for the ideal distribution the former is smaller than the latter. The measured distribution without symmetrical shape is not concentrated compared to Gaussian distribution.