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

Lookup NU author(s): Dr Wouter Saeys, Maria Velazco-Roa, Dr Suresh Thennadil

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Abstract

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.

Publication metadata

Author(s): Saeys W, Velazco-Roa MA, Thennadil SN, Ramon H, Nicolai BM

Publication type: Article

Publication status: Published

Journal: Applied Optics

Year: 2008

Volume: 47

Issue: 7

Pages: 908-919

Print publication date: 01/03/2008

ISSN (print): 1559-128X

ISSN (electronic): 1539-4522

Publisher: Optical Society of America

URL: http://dx.doi.org/10.1364/AO.47.000908

DOI: 10.1364/AO.47.000908

PubMed id: 18311262

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