Kim Jaejin, Han Jintae, Noh Jaegeun, Chung Hoeil
Analytical Spectroscopy Laboratory, Department of Chemistry, Hanyang University, Seoul, Korea, 133-791.
Appl Spectrosc. 2007 Jul;61(7):686-93. doi: 10.1366/000370207781393253.
A newly developed Raman collection scheme, a wide area illumination (WAI) scheme, was employed to demonstrate its utility for the analysis of petroleum products. For this purpose, the compositional analysis of simulated naphtha samples was attempted. The WAI scheme utilized a laser beam that illuminated a sample in a circular fashion with a diameter of 6 mm and a focal length of 250 mm. The reproducibility of the Raman measurement can be improved due to decreased sensitivity of the sample position as well as orientation with regard to the focal plane, as shown in a previous study. Near-infrared (NIR) spectroscopy, widely adopted in the field of petroleum refining, was also employed to compare with the prediction results obtained using the WAI scheme. Since the Raman spectral feature is more distinct and selective, the resulting calibration accuracy could be improved as long as reproducible Raman spectra could be collected. Overall prediction results using Raman spectroscopy were superior to those from NIR spectroscopy. The feasibility of the WAI scheme for reliable Raman analysis of petroleum products such as naphtha was demonstrated in this paper.
一种新开发的拉曼采集方案，即广域照明（WAI）方案，被用于证明其在石油产品分析中的效用。为此，尝试对模拟石脑油样品进行成分分析。WAI方案利用一束激光以圆形方式照射样品，直径为6毫米，焦距为250毫米。如先前研究所示，由于样品相对于焦平面的位置和方向的敏感性降低，拉曼测量的重现性可以得到提高。石油炼制领域广泛采用的近红外（NIR）光谱也被用于与使用WAI方案获得的预测结果进行比较。由于拉曼光谱特征更加明显和具有选择性，只要能够收集到可重现的拉曼光谱，校准精度就可以提高。使用拉曼光谱的总体预测结果优于近红外光谱的结果。本文证明了WAI方案对石脑油等石油产品进行可靠拉曼分析的可行性。
