Nondestructive quantification of chemical and physical properties of fruits by time-resolved reflectance spectroscopy in the wavelength range 650–1000 nm
- 1 February 2001
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 40 (4), 538-543
- https://doi.org/10.1364/ao.40.000538
Abstract
Time-resolved reflectance spectroscopy can be used to assess nondestructively the bulk (rather than the superficial) optical properties of highly diffusive media. A fully automated system for time-resolved reflectance spectroscopy was used to evaluate the absorption and the transport scattering spectra of fruits in the red and the near-infrared regions. In particular, data were collected in the range 650–1000 nm from three varieties of apples and from peaches, kiwifruits, and tomatoes. The absorption spectra were usually dominated by the water peak near 970 nm, whereas chlorophyll was detected at 675 nm. For all species the scattering decreased progressively with increasing wavelength. A best fit to water and chlorophyll absorption line shapes and to Mie theory permitted the estimation of water and chlorophyll content and the average size of scattering centers in the bulk of intact fruits.Keywords
This publication has 17 references indexed in Scilit:
- Quality measurement of fruits and vegetablesPostharvest Biology and Technology, 1999
- NON-DESTRUCTIVE MEASUREMENT OF ACIDITY, SOLUBLE SOLIDS, AND FIRMNESS OF JONAGOLD APPLES USING NIR-SPECTROSCOPYTransactions of the ASAE, 1998
- Kiwifruit Firmness by near Infrared Light ScatteringJournal of Near Infrared Spectroscopy, 1997
- Photon migration in the presence of a single defect: a perturbation analysisApplied Optics, 1995
- Diffusion approximation for a dissipative random medium and the applicationsPhysical Review E, 1994
- Boundary conditions for the diffusion equation in radiative transferJournal of the Optical Society of America A, 1994
- Optical reflectance and transmittance of tissues: principles and applicationsIEEE Journal of Quantum Electronics, 1990
- Time resolved reflectance and transmittance for the noninvasive measurement of tissue optical propertiesApplied Optics, 1989
- Time-resolved reflectance spectroscopy in turbid tissuesIEEE Transactions on Biomedical Engineering, 1989
- Optical methods for nondestructive quality evaluation of agricultural and biological materialsJournal of Agricultural Engineering Research, 1985