Non-destructive analysis of absorption and reduced scattering coefficients of green and golden kiwifruit
Decoupling optical properties of fruit and vegetables appears challenging, but necessary to get a better insight into the relationship between light and product attributes. In this study, 'SunGold' and 'Hayward' kiwifruit data were obtained using a laser diode emitting at 785 nm. A camera was employed for capturing the diffuse reflectance of the kiwifruit. Light attenuation profiles were analysed using pre-classification ranges of absorption (µa (cm‑1)) and scattering (µs' (cm‑1)) coefficients and subsequent application of Farrell's diffusion theory to decouple µa and µs'. Results indicate that the optical properties of the fruit were non-destructively analysed in line with values published on kiwifruit earlier. Differences of µa and µs' were found between cultivars. The coefficient of determination was high considering the prediction of cultivars (R2=0.98) with enhanced classification accuracy when using the absorption and scattering coefficients. The non-destructive approach appears to be suitable for inline sorting.
Yang, Z., Baranyai, L., Regen, C., Li, M., East, A.R. and Zude-Sasse, M. (2021). Non-destructive analysis of absorption and reduced scattering coefficients of green and golden kiwifruit. Acta Hortic. 1314, 499-504
laser-induced backscattering imaging, multispectral imaging, non-destructive, spatially resolved spectroscopy, Actinidia spp