Abstract
Non-destructive testing is becoming critical in the quality detection of products. Among several techniques, Time Domain — Nuclear Magnetic Resonance (TD-NMR) is gaining attention in the field of food quality control, thanks to its ability to detect liquid and solid materials, like water, oil and fat, which are strictly related to the quality of some kinds of products. The paper describes an original measurement method for the fast selection of the inshell hazelnuts, based on TD-NMR, which is able to detect the full-developed and well-dry nuts. The proposed method is based on the analysis of the amplitude of the Free Induction Decay (FID) signal and the second echo of the Carr Purcell Meiboom Gill (CPMG) signal. The relation among these quantities with the hazelnut kernel development and the moisture content is highlighted.
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