Food quality inspection by speckle decorrelation properties of bacteria colonies

V. Bianco; B. Mandracchia; F. Nazzaro; V. Marchesano; O. Gennari; M. Paturzo; S. Grilli; P. Ferraro

doi:10.1117/12.2272945

26 June 2017 Food quality inspection by speckle decorrelation properties of bacteria colonies

V. Bianco, B. Mandracchia, F. Nazzaro, V. Marchesano, O. Gennari, M. Paturzo, S. Grilli, P. Ferraro

Proceedings Volume 10333, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials III; 103331N (2017) https://doi.org/10.1117/12.2272945
Event: SPIE Optical Metrology, 2017, Munich, Germany

Abstract

The development of tools for rapid food quality inspection is a highly pursued goal. These could be valuable devices to be used by food producers in factories or the customers themselves in specific installations at the marketplace. Here we show how speckle patterns in coherent imaging systems can be can be employed as indicators of the presence of bacteria colonies contaminating food or water. Speckle decorrelation is induced by the self-propelling movement of these organisms when they interact with coherent light. Hence, their presence can be detected using a simple setup in a condition in which the single element cannot be imaged, but the properties of the ensemble can be exploited. Thanks to the small magnification factor we set, our system can inspect a large Field-of-View (FoV). We show the possibility to discriminate between fresh and contaminated food, thus paving the way to the rapid food quality testing by consumers at the marketplace.

Citation Download Citation

V. Bianco, B. Mandracchia, F. Nazzaro, V. Marchesano, O. Gennari, M. Paturzo, S. Grilli, and P. Ferraro "Food quality inspection by speckle decorrelation properties of bacteria colonies", Proc. SPIE 10333, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials III, 103331N (26 June 2017); https://doi.org/10.1117/12.2272945

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