Abstract:Flame soot is an import product as a result of incomplete combustion of hydrocarbon fuels, and has important effect on the generation of some pollutant. The optical properties of the soot are the base for the optical combustion diagnostics. Terahertz time-domain spectroscopy technique was used to study the optical properties of the soot within 0.2-1.6 THz and the frequency-domain spectra were obtained through Fourier transform. The complex refractive index of the soot was deduced by the fixed-point iteration. The comparison of the complex refractive index between terahertz spectra domain and thermal radiation spectra domain was conducted and two methods of extracting the parameters were also compared. The results indicated that the soot has strong absorption in the studied spectra and the difference in the refractive index between the two spectra domains was not obvious, but the absorptive index variation in the thermal radiation spectra domain was larger. The difference between the two parameter extraction methods was not significant. The deduced results can provide the optical data of soot for the application of terahertz time-domain spectroscopy technique to the optical combustion diagnostics, and extend the optical combustion diagnostics application area.
刘 冬, 严建华*, 王 飞, 黄群星, 池 涌, 岑可法. 太赫兹波段火焰碳黑的光学特性研究[J]. 光谱学与光谱分析, 2009, 29(12): 3185-3189.
LIU Dong, YAN Jian-hua*, WANG Fei, HUANG Qun-xing, CHI Yong, CEN Ke-fa. Study on the Optical Properties of Flame Soot in the Terahertz Spectra Domain. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(12): 3185-3189.
[1] Thomas H F, Ma J, James R R, et al. Progress in Energy Comhust. Sci., 1997, 23: 283. [2] Zhao H, Ladommatos N. Progress in Energy Comhust. Sci., 1998, 24: 221. [3] Modest M F. Radiative Heat Transfer. New York: McGraw-Hill, 1993. [4] XU Jing-zhou, ZHANG Xi-cheng(许景周, 张希成). Terahertz Science Technology and Applications(太赫兹科学技术和应用). Beijing: Peking University Press(北京: 北京大学出版社), 2007. [5] ZENG Xiao-ni, WANG Wei-ning(曾小妮, 王卫宁). Chemistry Bulletin(化学通报), 2007, 70(10): 777. [6] YUE Wei-wei, WANG Wei-ning, ZHAO Guo-zhong, et al(岳伟伟, 王卫宁, 赵国忠, 等). Acta Phys. Sin.(物理学报), 2005, 54(7): 3094. [7] YAN Zhi-gang, HOU Di-bo, CAO Bing-hua, et al(颜志刚, 侯迪波, 曹丙花, 等). Journal of Infrared and Millimeter Waves(红外与毫米波学报), 2008, 27(5): 326. [8] MA Xiao-qing, ZHAO Hong-wei, DAI Bin, et al(马晓菁, 赵红卫, 代 斌, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2008, 28(10): 2237. [9] Bassi J, Naftaly M, Miles B, et al. Flow Measurement and Instrumentation, 2005, 16: 341. [10] Cheville R A, Grischkowsky D. Optics Letters, 1995, 20(15): 1646. [11] SONG Yu-feng, ZHU Zhi-yong, JI Te, et al(宋玉峰, 朱智勇, 吉 特, 等). Acta Physico-Chemica Sinica(物理化学学报), 2007, 23(2): 177. [12] Withayachumnankul W, Ferguson B, Rainsford T, et al. Proc. of SPIE, 2005, 5840: 221.