公开(公告)号：US5856869A

公开(公告)日：1999-01-05

申请号：US657481

申请日：1996-05-29

申请人： John B Cooper ,  Philip E. Flecher ,  William T. Welch

发明人： John B Cooper ,  Philip E. Flecher ,  William T. Welch

IPC分类号： G01N21/65 ,  G01N33/28 ,  G01J3/44

CPC分类号： G01N21/65 ,  G01N33/2835

摘要： A distributed Bragg reflector (DBR) diode laser is used as excitation source for fiber optic Raman spectroscopy utilizing charge coupled device (CCD) detection and an image-corrected spectrograph. The DBR diode laser is superior to index guided diode lasers (Fabry-Perot) for elimination of mode hopping, elimination of frequency hysteresis as a function of both temperature and current changes, and reduction in laser broadband emission. These advantages allow the DBR laser to be used in industrial process control applications which are too demanding for index guided diode lasers.

摘要翻译： 使用分布式布拉格反射器（DBR）二极管激光器作为利用电荷耦合器件（CCD）检测和图像校正光谱仪的光纤拉曼光谱的激发源。 DBR二极管激光器优于用于消除模式跳变的指数二极管激光器（Fabry-Perot），消除作为温度和电流变化的函数的频率滞后以及激光宽带发射的减少。 这些优点使得DBR激光器可用于工业过程控制应用中，这些应用对索引导向二极管激光器要求过高。

公开(公告)号：US5892228A

公开(公告)日：1999-04-06

申请号：US724726

申请日：1996-09-30

申请人： John B Cooper ,  Roy R Bledsoe, Jr. ,  Kent L Wise ,  Michael B Sumner ,  William T Welch ,  Brian K Wilt

发明人： John B Cooper ,  Roy R Bledsoe, Jr. ,  Kent L Wise ,  Michael B Sumner ,  William T Welch ,  Brian K Wilt

IPC分类号： G01N21/65 ,  G01N33/28 ,  G01N21/35

CPC分类号： G01N33/2829 ,  G01N21/65

摘要： A Fourier-Transform Raman spectrometer was used to collect the Raman spectra of (208) commercial petroleum fuels. The individual motor and research octane numbers (MON and RON, respectively) were determined experimentally using the industry standard ASTM knock engine method. Partial Least Squares (PLS) regression analysis can be used to build regression models which correlate the Raman spectra (175) of the fuels with the experimentally determined values for MON, RON, and pump octane number (the average of MON and RON) of the fuels. Each of the models was validated using leave-one-out validation. The standard errors of validation (SEV) are 0.415, 0.535, and 0.410 octane numbers for MON, RON, and pump octane number, respectively. By comparing the standard error of validation to the standard deviation for the experimentally determined octane numbers, it is evident that the accuracy of the Raman determined values is limited by the accuracy of the training set used in creating the models. The Raman regression models were used to predict the octane numbers for the fuels which were not used to build the models. The results compare favorably with the leave-one-out validation. Also, it is demonstrated that the experimentally determined Reid Vapor Pressures are highly correlated with the Raman spectra of the fuel samples and can be predicted with a standard error of 0.568 psi.

摘要翻译： 傅立叶变换拉曼光谱仪用于收集（208）商业石油燃料的拉曼光谱。 使用行业标准的ASTM爆震引擎法，实验地确定了单个运动和研究辛烷值（MON和RON）。 部分最小二乘法（PLS）回归分析可用于建立将燃料的拉曼光谱（175）与MON，RON和泵辛烷值（MON和RON的平均值）的实验确定值相关联的回归模型 燃料。 每个模型都使用一次性验证验证。 验证标准误差（SEV）分别为MON，RON和泵辛烷值的0.415,0.535和0.410辛烷值。 通过将验证的标准误差与实验确定的辛烷值的标准偏差进行比较，显然拉曼测定值的精度受到创建模型中使用的训练集的准确性的限制。 拉曼回归模型用于预测未用于构建模型的燃料的辛烷值。 结果与遗留一次验证相比较。 此外，证明了实验确定的Reid蒸汽压力与燃料样品的拉曼光谱高度相关，并且可以用0.568psi的标准误差预测。