, Volume 28, Issue 1, pp 293-300
Date: 23 Jan 2014

Near infrared reflectance spectroscopy: Moisture content measurement for ceramic plaster

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We measured moisture content of ceramic plaster using near infrared reflectance spectroscopy (NIRS) as required by the ceramic industry. The moisture content and the normalized spectral reflectance were measured and correlated at the wavelengths of the spectral absorptance peaks (α λ ), spectral sensitivity peaks (S λ ) and normalized sensitivity peaks (S λn ), in the wavelength range of 900–2500 nm. The best model was obtained by the scanning method, normalizing the sensitivity and doing a minimization of the standard error of estimate (SE). The α λ -peaks, s λ -peaks and s λn -peaks were not found at the same wavelength, for the three studied wavebands. The optimal model in terms of SE was the linear model at 1420 nm (s λ -peak), for the ceramist drying range with a SE 1420 =1.25 (R2=0.96). The results indicate the feasibility of NIRS to non-contact moisture content measures of plaster in the studied range, even more for ceramist range.

Recommended by Editor Sung-Lim Go
Karla María Aguilar Castro received her B.Sc. degree in Chemical Engineering from the Instituto Tecnológico de Tuxtla Gutierrez, Chiapas, México, in 2005 and the M.Sc. and Ph.D. in Mechanical Engineering from the Centro Nacional de Investigación y Desarrollo Tecnológico (CENIDET) at Cuernavaca, Morelos-México, in 2008 and 2013. Her research is focused on solar drying and infrared spectroscopy applied to moisture measures.
José Jassón Flores Prieto received his B. Sc. degree in Mechanical Engineering from the Universidad at Guanajuato, México, in 1994, and his M.Sc. and Ph.D degrees from the Universidad Nacional Autónoma de México, in 1996 and 2004 respectively. Currently he is a professor of Mechanical Engineering at the CENIDET at Cuernavaca, Morelos-México. His main research field is solar energy applications in solar drying, solar collectors and solar calorimetry applied to building materials characterization.
Edgar Vicente Macias Melo received his B.Sc. degree in Mechanical Engineering from the Faculty of Mechanical Engineering of the Universidad Veracruzana, México, in 2005 and the M.Sc. and Ph.D. in Mechanical Engineering from the CENIDET at Cuernavaca, Morelos-México, in 2008 and 2013. His research is focused on thermal and optical characterization of materials.