title: Composition analysis of scattering liquids based on spatially offset visible-near-infrared spectroscopy.
abstract: Spatially offset visible-near-infrared (VIS-NIR) spectroscopy was used to analyze of chemical compositions of the scattering liquids in the visible and near-infrared region from 530 to 930 nm. An experimental setup was designed based on a supercontinuum white-light laser source, an electrically controlled translation stage, and a high-performance spectrometer. The spatially offset spectra of the scattering liquids (composed of diluted Intralipid(®) 20% in distilled water) were measured at 24 sequential positions in the radial distribution from the incident light. A partial least squares regression method was applied to obtain the Intralipid(®) concentration from the spatially offset spectra. The results showed that the prediction accuracy of the Intralipid(®) concentration obtained from the spectra collected at multiple sample points was better than that obtained from the spectra collected at a single sample point. The coefficient of determination in the prediction set is 0.9835 at the optimized number of sample points.
authors.affiliation: State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, PR China.
authors.forename: Chan
authors.initials: C
authors.lastname: Xiong
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.forename: Ling
authors.initials: L
authors.lastname: Lin
mesh_terms: D004655:Emulsions / Q000737:chemistry; D016018:Least-Squares Analysis; D008027:Light; D008956:Models, Chemical; D019047:Phantoms, Imaging; D010743:Phospholipids / Q000737:chemistry; D012542:Scattering, Radiation; D013024:Soybean Oil / Q000737:chemistry; D019265:Spectroscopy, Near-Infrared / Q000379:methods*
chemical_list: D004655:Emulsions; D010743:Phospholipids; C545823:soybean oil, phospholipid emulsion; D013024:Soybean Oil