非常温原油透射光谱测量及光学物性影响分析

Influences of extraordinary temperature on transmission spectrum measurement and optical properties of crude oil

中文关键词: 原油  红外光谱  温度  光学常数  热辐射物性参数

英文关键词: crude oil  infrared spectrum  temperature  optical constants  thermal radiation physical parameters

中文摘要:

      针对高温采油环境传统检测方法无法实现在线检测的问题，设计了恒温实验系统，利用傅立叶变换红外光谱仪IRTracer-100测量了不同温度下原油的透射光谱，基于双厚度法反演出原油的光学常数n和k与热辐射物性参数α和ρ，研究了不同温度对T、n、k、α和ρ的影响。结果表明：在400cm-1~4000cm-1波段内，不同温度下原油透射光谱变化趋势相同，且存在726cm-1、1382cm-1、1471cm-1、2849cm-1四个吸收峰。在吸收峰处，温度对原油的透射光谱和光学参数影响显著；随着温度的升高，n逐渐减小，温度为70℃，频率为2849cm-1时，n达到最小为1.3387。k和α随温度变化规律一致，40℃时，k和α均达到最大，分别为1.65E-04和592.70。ρ受温度影响波动较小，在0.0142~0.0905内变化。

英文摘要:

      In view of the problem that traditional detection methods can not realize on-line detection in high temperature environment, a constant temperature experimental system is designed. The transmission spectra of crude oil at different temperatures were measured by Fourier transform infrared spectrometer IRTracer-100, and the optical constants n and k and thermal radiation physical parameters of crude oil were inverted based on double thickness method. The effects of different temperatures on T, n, k, α and ρ were studied. The results show that the transmission spectrum of crude oil has the same trend at different temperatures in the range of 400 cm-1 to 4000 cm-1, and there are four absorption peaks: 726 cm-1, 1382 cm-1, 1471 cm-1 and 2849 cm-1. At the absorption peak, temperature has a significant effect on the transmission spectrum(T) and optical parameters of crude oil. With the increase of temperature, n decreases gradually, and reaches a minimum of 1.3387 when the temperature is 70 ℃ and the frequency is 2849cm-1. The law of k and α changing with temperature is the same. At 40 ℃, k and α reach the maximum, which are 1.65E-04 and 592.70, respectively. ρ fluctuates slightly under the influence of temperature and varies from 0.0142 to 0.0905.