In this study, the optimal distance between the light source and the sensor by each apple size was investigated for soluble solid content (SSC) measurement, and 1D-Convolutional Neural Network (CNN) SSC models were developed at that distance. The visible/near-infrared transmittance spectra of apple in the range of 400 to 1100 nm were measured using a 100W halogen light source. The distance between the light source and the sensor was set at three levels, which had less impact on the size of the apple investigated in the previous study. The transmission spectra of the fruit were measured at the distance of each level by size, and the SSC was also measured. 1D- CNN was used to develop SSC estimation models. The results of this study showed that 1D-CNN technology could improve the SSC measurement performance of apples. In the future, these deep learning results can be applied to a high-performance online non-destructive fruit sorter.
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