Abstract
A nondestructive detection method using a transmission line for the detection of foreign objects in food is proposed. The proposed method uses the ratio of the real and imaginary parts of the dielectric constant of the material in the transmission line, which is proportional to the ratio of the phase change and amplitude change in the transmitted wave. During the detection of foreign objects in food, different gradients are observed because the foreign objects cause differences in the values of the complex permittivity and dielectric loss. Therefore, the proposed method can detect foreign objects without any information about them. The proposed method was tested with actual food (a vegetable salad). As a result, the proposed method successfully detected a small stone and a small piece of glass in a vegetable salad.
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