title: Diffuse Reflectance Spectroscopy of Hidden Objects. Part II: Recovery of a Target Spectrum.
abstract: In this study, we consider the reconstruction of a diffuse reflectance near-infrared spectrum of an object (target spectrum) in case the object is covered by an interfering absorbing and scattering layer. Recovery is performed using a new empirical method, which was developed in our previous study. We focus on a system, which consists of several layers of polyethylene (PE) film and underlayer objects with different spectral features. The spectral contribution of the interfering layer is modeled by a three-component two-parameter multivariate curve resolution (MCR) model, which was built and calibrated using spectrally flat objects. We show that this model is applicable to real objects with non-uniform spectra. Ultimately, the target spectrum can be reconstructed from a single spectrum of the covered target. With calculation methods, we are able to recover quite accurately the spectrum of a target even when the object is covered by 0.7 mm of PE.
authors.affiliation: 1 Semenov Institute of Chemical Physics RAS, Moscow, Russia.|2 Branch of Institute of Natural and Technical Systems RAS, Sochi, Russia.
authors.forename: Alexey L
authors.initials: AL
authors.lastname: Pomerantsev
authors.affiliation: 1 Semenov Institute of Chemical Physics RAS, Moscow, Russia.
authors.forename: Oxana Ye
authors.initials: OY
authors.lastname: Rodionova
authors.affiliation: 3 Peter the Great St Petersburg State Polytechnic University, St. Petersburg, Russia.
authors.forename: Alexej N
authors.initials: AN
authors.lastname: Skvortsov
keywords: MCR; Near-infrared diffuse reflectance spectroscopy; multilayer systems; multivariate curve resolution; polyethylene films; reflectance; scattering; spectrum recovery