Abstract

Investigation of a sample covered by an interfering layer is required in many fields, e.g., for process control, biochemical analysis, and many other applications. This study is based on the analysis of spectra collected by near-infrared (NIR) diffuse reflectance spectroscopy. Each spectrum is a composition of a useful, target spectrum and a spectrum of an interfering layer. To recover the target spectrum, we suggest using a new phenomenological approach, which employs the multivariate curve resolution (MCR) method. In general terms, the problem is very complex. We start with a specific problem of analyzing a system, which consists of several layers of polyethylene (PE) film and underlayer samples with known spectral properties. To separate information originating from PE layers and the target, we modify the system versus both the number of the PE layers as well as the reflectance properties of the target sample. We consider that the interfering spectrum of the layer can be modeled using three components, which can be tentatively called transmission, absorption, and scattering contributions. The novelty of our approach is that we do not remove the reflectance and scattering effects from the spectra, but study them in detail aiming to use this information to recover the target spectrum.

© 2017 The Author(s)

Quantitative interpretations of Visible-NIR reflectance spectra of blood

Yulia M. Serebrennikova, Jennifer M. Smith, Debra E. Huffman, German F. Leparc, and Luis H. García-Rubio
Opt. Express 16(22) 18215-18229 (2008)

Optical diffuse reflectance accessory for measurements of skin tissue by near-infrared spectroscopy

R. Marbach and H. M. Heise
Appl. Opt. 34(4) 610-621 (1995)

Specialized source-detector separations in near-infrared reflectance spectroscopy platform enable effective separation of diffusion and absorption for glucose sensing

Jin Liu, Tongshuai Han, Jingying Jiang, and Kexin Xu
Biomed. Opt. Express 10(9) 4839-4858 (2019)

Artificial neural networks for retrieving absorption and reduced scattering spectra from frequency-domain diffuse reflectance spectroscopy at short source-detector separation

Yu-Wen Chen, Chien-Chih Chen, Po-Jung Huang, and Sheng-Hao Tseng
Biomed. Opt. Express 7(4) 1496-1510 (2016)

Visible spectral dependence of the scattering and absorption coefficients of pigmented coatings from inversion of diffuse reflectance spectra

Fernando Curiel, William E. Vargas, and Rubén G. Barrera
Appl. Opt. 41(28) 5969-5978 (2002)