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生物柴油光学常数的双光程法实验测量

Experimental Measurement of Optical Constant of Biodiesel by Double Optical Pathlength Transmission Method

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摘要

生物柴油光学常数在其成分的定量定性分析、与柴油的混合水平判断以及辐射吸热机理研究等方面具有重要应用。基于射线踪迹法推导得到光学玻璃-生物柴油-光学玻璃三层平板结构的双光程法透射率模型,实验测量了300~2500 nm 波段内生物柴油光学常数随温度的变化规律。实验结果表明,在20 ℃~60 ℃温度范围内,生物柴油折射率随温度的升高而线性减小,吸收指数受温度影响较弱;吸收光谱在1200、1390、1750、2150 和2300 nm 处出现明显的吸收峰,其形成原因主要为C—H 键的倍频以及各原子团伸缩振动的和频作用;生物柴油吸收峰与普通植物油吸收峰的峰值位置基本相同,但数值大小有所区别。

Abstract

The optical constant of biodiesel plays an important role in quantitatively and qualitatively analyzing its individual constituent, judging the mixed level with diesel fuel, and studying the intrinsic mechanism of radiation transfer. Transmittance model of the three-layer-plate structure (optical glass -biodiesel -optical glass) is derived based on the ray trace method. Experimental measurement by double optical pathlength transmission method is conducted to study the temperature dependence of optical constant of biodiesel in the spectral range from 300 nm to 2500 nm. The results show that the refractive index of biodiesel decreases linearly with temperature increasing from 20 ℃ to 60 ℃, but the absorption index is less affected. Moreover, five main absorption peaks of biodiesel are observed at 1200, 1390, 1750, 2150 and 2300 nm, which are due to overtones and combinations of C—H stretching vibration of various chemical groups. Compared with ordinary vegetable oil, absorption peaks of the biodiesel exhibit the same locations but different amplitudes.

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中图分类号:O433.1

DOI:10.3788/lop52.051206

所属栏目:仪器,测量与计量

基金项目:国家自然科学基金(51336002)、创新研究群体科学基金(IRT0914)、新世纪优秀人才支持计划(NCET-12-0152)

收稿日期:2014-12-04

修改稿日期:2014-12-31

网络出版日期:2015-04-28

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王程超:哈尔滨工业大学(威海)汽车工程学院, 山东 威海 264209哈尔滨工业大学能源科学与工程学院, 黑龙江 哈尔滨 150001
李兴灿:哈尔滨工业大学能源科学与工程学院, 黑龙江 哈尔滨 150001
谭建宇:哈尔滨工业大学(威海)汽车工程学院, 山东 威海 264209
刘林华:哈尔滨工业大学(威海)汽车工程学院, 山东 威海 264209哈尔滨工业大学能源科学与工程学院, 黑龙江 哈尔滨 150001

联系人作者:王程超(14B902026@hit.edu.cn)

备注:王程超(1989—),女,博士研究生,主要从事液体热物性的实验测量及第一性原理计算等方面的研究。

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引用该论文

Wang Chengchao,Li Xingcan,Tan Jianyu,Liu Linhua. Experimental Measurement of Optical Constant of Biodiesel by Double Optical Pathlength Transmission Method[J]. Laser & Optoelectronics Progress, 2015, 52(5): 051206

王程超,李兴灿,谭建宇,刘林华. 生物柴油光学常数的双光程法实验测量[J]. 激光与光电子学进展, 2015, 52(5): 051206

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