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30 January 2012 Development of an automatics joint-area-measurement system after ultrafast laser microwelding
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The present study is undertaken in order to develop an automatic measurement system for light transmissibility of jointed transparent materials using high-rate-pulses ultrafast laser microwelding. To measure joint strength, it is necessary to measure the tensile strength and welded area quantitatively. Especially, the welded area greatly influences joint strength in the microwelding. Thus, it is important to distinguish the welded area and non-welded area. The welded sample was irradiated by He-Ne laser light, and the light, which passed through the welded sample, was detected by a photo detector. The transmitted light has two intensity levels because the transmissibly of light is different in the welded area and non-welded area of the welded sample. Wherein, the welded area and non-welded area are classified by irradiating the He-Ne light to the sample, and detecting the transmitted light. This technique is also applied to determine the accurate welded area after welding using various shapes such as spiral and rectangular, the relationship between joint strength and shapes will be presented.
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Y. Nonogaki, K. Okusu, M. Yoshimoto, and T. Tamaki "Development of an automatics joint-area-measurement system after ultrafast laser microwelding", Proc. SPIE 8247, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XII, 82471D (30 January 2012);

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