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Proceedings Paper

Spatially resolved spectroscopy for nondestructive quality measurements of Braeburn apples cultivated in sub-fertilization condition
Author(s): Nghia Nguyen Do Trong; Chyngyz Erkinbaev; Bart Nicolaï; Wouter Saeys; Mizuki Tsuta; Josse De Baerdemaeker
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Paper Abstract

A contact spatially resolved spectroscopy (SRS) setup based on a fiber-optics probe in the Vis/NIR range (400-1000 nm) was developed, calibrated, and validated for its measurements and optical properties estimation by means of a metamodeling method on a set of liquid optical phantoms. Thirty Braeburn apples cultivated in sub-fertilization condition were harvested and measured before and after shelf-life storage (2 weeks at 18 °C) by the setup and were analyzed for quality attributes (firmness and soluble solids contents (SSC)) by destructive reference methods. Estimated optical properties (absorption and reduced scattering coefficients) acquired from SRS measurements at the beginning and the end of the shelf-life indicated changes in chemical composition of the apples. Partial Least Squares Regression (PLSR) was employed to construct calibration models relating the estimated optical properties to the reference quality attributes. The constructed PLS models based on the absorption coefficient spectra gave good prediction performance for the quality attributes of the apples in the validation set with correlation coefficients r of 0.901 and r of 0.844, respectively for SSC and firmness. The obtained results clearly show the potential of the SRS measurements for nondestructive quality evaluation of apples.

Paper Details

Date Published: 17 May 2013
PDF: 7 pages
Proc. SPIE 8881, Sensing Technologies for Biomaterial, Food, and Agriculture 2013, 88810L (17 May 2013); doi: 10.1117/12.2030407
Show Author Affiliations
Nghia Nguyen Do Trong, Katholieke Univ. Leuven (Belgium)
Chyngyz Erkinbaev, Katholieke Univ. Leuven (Belgium)
Bart Nicolaï, Katholieke Univ. Leuven (Belgium)
Wouter Saeys, Katholieke Univ. Leuven (Belgium)
Mizuki Tsuta, National Food Research Institute (Japan)
Josse De Baerdemaeker, Katholieke Univ Leuven (Belgium)
Kyoto Univ. (Japan)

Published in SPIE Proceedings Vol. 8881:
Sensing Technologies for Biomaterial, Food, and Agriculture 2013
Naoshi Kondo, Editor(s)

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