| Project/Area Number |
14550182
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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 |
Thermal engineering
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| Research Institution | Osaka University |
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Principal Investigator |
KOMIYAMA Masaharu Osaka University, Mechanophysics Engineering, Assistant Professor, 大学院・工学研究科, 講師 (40178372)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2003: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2002: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Diode Laser / Infrared Absorption / Absorption Spectrum / Water Vapor / High Temperature Measurement |
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| Research Abstract |
The infrared absorption spectroscopy by use of diode laser is a simple and advanced gas temperature and species concentration measuring method. This method enables us to measure temperature and concentration of a gas simultaneously and continuously and to measure variety kinds of gas concentration by the light source of multi-wavelengths. In this study, water vapor as an absorbing medium was selected. The objectives of this study are to examine the characteristics of the absorption spectrum or the combination of the absorption lines and to develop gas temperature measurement by selected absorption lines under high temperature conditions. The results obtained by this study are described below.
(1) The characteristics of the absorption spectrum used for high temperature measurement were examined. The pair of measurement wavelengths as absorption lines was selected as the result paying attention to the following items; (i) the energy difference between them before absorption transition is large, (ii) They have large absorption line intensity in high temperature, (iii) At the reference temperature, the absorption line intensity of the center line is large and the ratio of absorption line intensity is also large and (iv) they are isolated from other absorption bands. (2) Two sets of diode lasers were used to measure flame temperature from 1350K to 1800K by scanning the infrared absorption spectrum of water vapor. (3) Although the measured absorption spectrum is mostly in agreement with the calculation result based on an absorption coefficient database, the parts which has a difference in the line intensity and the line width or the temperature dependency of the absorption line intensity was recognized. (4) The ratio of the absorption line intensity obtained from the measured absorption spectrum corresponds to the calculation result by the absorption coefficient database. But, the deviation of the intensity ratio is large in 1600K or higher temperature.
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