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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 3, Iss. 4 — Apr. 23, 2008

Optical properties of apple skin and flesh in the wavelength range from 350 to 2200 nm

Wouter Saeys, Maria A. Velazco-Roa, Suresh N. Thennadil, Herman Ramon, and Bart M. Nicolaï  »View Author Affiliations

Applied Optics, Vol. 47, Issue 7, pp. 908-919 (2008)

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Optical measurement of fruit quality is challenging due to the presence of a skin around the fruit flesh and the multiple scattering by the structured tissues. To gain insight in the light-tissue interaction, the optical properties of apple skin and flesh tissue are estimated in the 350 2200 nm range for three cultivars. For this purpose, single integrating sphere measurements are combined with inverse adding– doubling. The observed absorption coefficient spectra are dominated by water in the near infrared and by pigments and chlorophyll in the visible region, whose concentrations are much higher in skin tissue. The scattering coefficient spectra show the monotonic decrease with increasing wavelength typical for biological tissues with skin tissue being approximately three times more scattering than flesh tissue. Comparison to the values from time-resolved spectroscopy reported in literature showed comparable profiles for the optical properties, but overestimation of the absorption coefficient values, due to light losses.

© 2008 Optical Society of America

OCIS Codes
(290.0290) Scattering : Scattering
(290.4210) Scattering : Multiple scattering
(290.7050) Scattering : Turbid media
(300.1030) Spectroscopy : Absorption
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6550) Spectroscopy : Spectroscopy, visible

ToC Category:

Original Manuscript: September 4, 2007
Revised Manuscript: December 12, 2007
Manuscript Accepted: January 3, 2008
Published: February 28, 2008

Virtual Issues
Vol. 3, Iss. 4 Virtual Journal for Biomedical Optics

Wouter Saeys, Maria A. Velazco-Roa, Suresh N. Thennadil, Herman Ramon, and Bart M. Nicolaï, "Optical properties of apple skin and flesh in the wavelength range from 350 to 2200 nm," Appl. Opt. 47, 908-919 (2008)

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  1. B. M. Nicolaï, K. Beullens, E. Bobelyn, A. Peirs, W. Saeys, K. I. Theron, and J. Lammertyn, “Nondestructive measurement of fruit and vegetable quality by means of NIR spectroscopy: a review,” Postharvest Biol. Technol. 46, 99-118 (2007). [CrossRef]
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