研究目的
To investigate the fundamentals of laser material processing, such as laser welding, by visualizing and analyzing the laser-induced process dynamics occurring inside optically nontransparent workpieces.
研究成果
The high-speed x-ray imaging system is capable of resolving submillimeter objects at 1 kHz, making it suitable for investigating laser welding processes. However, image quality is limited by edge blurring and noise, suggesting the need for further improvements such as direct conversion x-ray cameras or synchrotron beam sources.
研究不足
The system's performance is limited by edge blurring, contrast reduction for small objects, and noise introduced by the image intensifier. The spatial resolution is affected by the imaging system's blurring, and the temporal resolution is constrained by the exposure time.
1：Experimental Design and Method Selection:
The system consists of a microfocused x-ray tube and an imaging system, including a scintillator, an image intensifier, and a high-speed camera.
2：Sample Selection and Data Sources:
The system was tested with samples of steel, aluminum, and copper to analyze the attenuation of x-ray radiation.
3：List of Experimental Equipment and Materials:
The setup includes a microfocused x-ray tube, a scintillator made of thallium activated cesium iodide, an image intensifier, and a high-speed camera.
4：Experimental Procedures and Operational Workflow:
The x-ray tube emits radiation through the sample, which is welded from the top using laser optics. The imaging system converts x-rays into visible light, which is then amplified and recorded.
5：Data Analysis Methods:
The contrast and signal-to-noise ratio were analyzed to evaluate the system's performance.
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