Novel Laser Detection System of Foreign Materials in Food

Abstract

We have been developing a detection system using lasers for foreign materials in some foods such as raisins, tomatoes, and grapes. Here we describe experimental results required for constructing the detection system. We have observed that some foreign materials mixed in raisins could be discriminated by taking laser emission reflectance ratios at appropriately chosen two laser wavelengths. Based on the experimental results, a prototype of the foreign food detection system has been produced.