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초록· 키워드

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In recent years, concern has been raised about the technique of controlling electrical breakdown by using laser in many fields. Especially, laser has attracted much attention in the Electro-Discharge Machining(EDM) because of its many merits. Therefore, this research has been performed to obtain fundamental data relevant to discharge processing by using a pulsed Nd: YAG laser, The experiments of laser-guided de discharge by laser radiation have been carried out at low air pressure ranging from 0,2 to 20 torr, The minimum laser-guided de discharge voltage V_(G min) at the given pressures P and distances D between an anode and a cathode was measured. It is found that the minimum laser-guided de discharge voltage is much lower than the natural discharge voltage V_(ND), and the values of V_(G.min) and V_(ND) as a function of PㆍD has a similar tendency. The laser output energy Bout decreases with input pulse duration tp increasing, and the more the value of tp increases, the higher that of V_(G min) is obtained because the number of photons during the discharge time N decreases with t_p increasing. There is the time lag frequently when the discharge by laser radiation is misguided under the condition of the applied voltage less than V_(G.min).

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Abstract

Ⅰ. Introduction

Ⅱ. Experiments

Ⅲ. Results and Discussion

Ⅳ. Conclusion

References

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UCI(KEPA) : I410-ECN-0101-2009-569-017766022