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Proceedings Paper

Calibration of visible and near infrared spectrums for measuring freshness of vegetables
Author(s): Faisal Abdullah; M. Z. Mat Jafri; M. S. Jaafar; C. J. Wong
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Paper Abstract

A new nondestructive methods based on optical properties at multiple wavelengths is being applied to measure the freshness of some vegetables. The principle of this method is to determine the absorbance and the reflectance of a sample in visible and near infrared region. When a light beam is illuminated upon a piece of vegetable sample, the majority of the lights penetrate into the sample tissue. Upon entering the tissue, photons scatter in different directions. Some are absorbed, some pass-through to the whole sample and emerge from the opposite side, and some scatter back and reemerge from the region adjacent to the incident center. While the absorption is related to certain chemical constituent of the sample, scattering is influenced by the density, compositions, cells and intercellular structures of samples and therefore can be useful for measuring samples freshness. Our objectives are to investigate the spectral behavior of some vegetables and to develop an algorithm for a non-destructive freshness sensor system using visible and near infrared light sources. The preliminary results of the study showed that the freshness of green mustard leaf and onion using a red (λ = 633 nm) and green (λ = 808 nm) light sources were closely related.

Paper Details

Date Published: 17 March 2008
PDF: 6 pages
Proc. SPIE 6939, Thermosense XXX, 69390J (17 March 2008); doi: 10.1117/12.777713
Show Author Affiliations
Faisal Abdullah, Univ. Sains Malaysia (Malaysia)
Syiah Kuala Univ. (Indonesia)
M. Z. Mat Jafri, Univ. Sains Malaysia (Malaysia)
M. S. Jaafar, Univ. Sains Malaysia (Malaysia)
C. J. Wong, Univ. Sains Malaysia (Malaysia)

Published in SPIE Proceedings Vol. 6939:
Thermosense XXX
Vladimir P. Vavilov; Douglas D. Burleigh, Editor(s)

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