摘要
现场天然气的温度、压强影响利用光谱数据进行定量分析的精度,对一定浓度甲烷气体的傅里叶红外光谱图随气体温度和总压强的变化规律进行了实验研究。结果表明,温度、总压强和光谱数据之间有很好的线性关系,所建温度PLS预测模型,相关系数高达0.9998,校正均方根误差(RMSEC)为0.658,验证均方根误差(RMSEP)为0.951,相对误差不超过2.79%;在一定范围内,谱带吸收强度和峰宽随温度(气体体积不变)、总压强的升高而增大,峰面积的增加量与温度、压强增加量近似成正比。
The in-situ temperature and pressure of the natural gas influence the accuracy of quantitative analysis by spectral data, and the variation of Fourier transform infrared spectra of methane of a certain concentration along with the change of temperature and total pressure was experimentally studied. The results showed that a good linear relationship existed between both temperature and total pressure and the spectral data,and the correlation coefficient （Corr. Coeff. ） of the PLS prediction model of the temperature established reached 0. 9998, and the root mean square error of calibration （RMSEC） was 0. 658,root mean square error of prediction （RMSEP）was 0. 951, and relative error（Difference） was less than 2. 79%. The band intensity and peak width of the absorption spectra increased with the rise of temperature （while the volume of gas was constant） and pressure at a certain range, and the increment of absorption peak area was proportionally with the increments of temperature and pressure ,approximately.
出处
《光谱实验室》
CAS
CSCD
2012年第6期3273-3278,共6页
Chinese Journal of Spectroscopy Laboratory
基金
国家自然科学基金(60908039)
关键词
红外光谱
气体
温度
压强
Infrared Spectrum
Gas
Temperature
Pressure
