Abstract
This paper reports monitoring fruits maturation using speckle technique. Performed measurements aim the assessing of biological inner fruit variation effect on the speckle image. We show that the speckle grain size is both affected by the glucose level inside the fruits and by the chlorophyll content. Moreover, the determination of circular polarization degree and circular grain size indicate that a Rayleigh diffusion regime gradually becomes predominant in fruits. Principal component analysis is used to highlight high correlation between results and strengthen the establishment of speckle as a novel non invasive method to monitor fruits ripening.
Highlights
The use of non invasive and non destructive methods to follow the ripening of fruits and vegetables is a subject of interest in agriculture
We showed that as the glucose content is increasing, DOPC reaches negative values and dxC⊥ becomes greater than dxC//
This signature is proper to medium constituted of a significant part of small scatterers where Rayleigh diffusion regime overweighs Mie regime
Summary
The use of non invasive and non destructive methods to follow the ripening of fruits and vegetables is a subject of interest in agriculture. Speckle is a phenomenon produced by laser illumination of a medium, resulting from the temporally non stationary interference of light scattered by diffusing objects. This method proved its ability to monitor fruits ripening and to assess bruising in fruits using correlation between images [3], Time History of a Speckle Pattern method (THSP) [4] or the Weighted Generalized Differences method (WGD) [5]. We report results based on speckle polarization analysis correlated to fruits content variation obtained from biochemical and fluorescence measurements.
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