title: Near-infrared photon time-of-flight spectroscopy of turbid materials up to 1400 nm.
abstract: Photon time-of-flight spectroscopy (PTOFS) is a powerful tool for analysis of turbid materials. We have constructed a time-of-flight spectrometer based on a supercontinuum fiber laser, acousto-optical tunable filtering, and an InP/InGaAsP microchannel plate photomultiplier tube. The system is capable of performing PTOFS up to 1400 nm, and thus covers an important region for vibrational spectroscopy of solid samples. The development significantly increases the applicability of PTOFS for analysis of chemical content and physical properties of turbid media. The great value of the proposed approach is illustrated by revealing the distinct absorption features of turbid epoxy resin. Promising future applications of the approach are discussed, including quantitative assessment of pharmaceuticals, powder analysis, and calibration-free near-infrared spectroscopy.
authors: Department of Physics, Lund University, P.O. Box 118, S-221 00 Lund, Sweden.
authors: Tomas
authors: T
authors: Svensson
authors: Erik
authors: E
authors: Alerstam
authors: Dmitry
authors: D
authors: Khoptyar
authors: Jonas
authors: J
authors: Johansson
authors: Staffan
authors: S
authors: Folestad
authors: Stefan
authors: S
authors: Andersson-Engels
mesh_terms: D004853:Epoxy Resins / Q000737:chemistry; D017785:Photons; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation / Q000379:methods; D014025:Titanium / Q000737:chemistry
chemical_list: D004853:Epoxy Resins; C009495:titanium dioxide; D014025:Titanium