1997 Fiscal Year Final Research Report Summary
Research on Particle and Energy Transfer in Metal-halide-discharge
| Project/Area Number |
08650341
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | Oita University |
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Principal Investigator |
HAMAMOTO Makoto Oita University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30156418)
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| Project Period (FY) |
1996 – 1997
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| Keywords | Metal-halide-discharge / RF discharge / HID lamp / Electrodeless lamp / Emission spectroscopy / Laser-induced-fluorescence / Particle density measurements / Temperature measurements |
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| Research Abstract |
A few spectroscopic methods were applied for inductively-coupled metal-halide-lamp in order to measure density distributions of electron, ion and excited species and to determine temperature distributions. (1)Stark-broadened and-shifted spectral profiles of Na emission lines (568.266,568.822 nm) were used to determine elecron density distributions, whose maxima were increased from 3 to 5 x 10^<21> m^<-3> with increase of RF power from 150 to 300 W.(2)Laser induced fluorescence (LIF) method was applied for the ground state of scandium ion, and obtained signals showed the decrease of up to 40% of their intensities with increase of RF poewr. (3)Optical emission spectroscopy was used to determine the density distributions of excited species [Sc^<**>, (Sc^+)^<**>, Na^<**>] . Emission intensities of spectral lines of (Sc^+)^<**> were all decreased up to 40% with increase of RF power, although those of Sc^<**> and Na^<**> were all increased up to three times and even thirteen times, respectively, on the same conditions. (4)From the ratios of emission intensities of spectral lines of Sc^<**> and (Sc^+)^<**>, the temperatures were estimated to be about 5,000K at maximum, which were decreased by about 300K with increase of RF power.
A discharge model based on the thermal equilibrium analysis, was introduced to explain all the above experimental results, which suggests i)the increase of incoming flux of metal atoms, especially of Na atom, from the quartz wall and ii)the resultant decrease of the arc temperature, with increase of RF power.
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Research Products
(2 results)
