Near-infrared photon time-of-flight spectroscopy of turbid materials up to 1400 nm.
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.
Svensson
Tomas
T
Department of Physics, Lund University, P.O. Box 118, S-221 00 Lund, Sweden.
Alerstam
Erik
E
Khoptyar
Dmitry
D
Johansson
Jonas
J
Folestad
Staffan
S
Andersson-Engels
Stefan
S
D004853:Epoxy Resins / Q000737:chemistry; D017785:Photons; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation / Q000379:methods; D014025:Titanium / Q000737:chemistry
D004853:Epoxy Resins; C009495:titanium dioxide; D014025:Titanium