Laboratory measurement of the dielectric permittivity of vegetals at 430 kHz. Correlation between apparent permittivity of a set of wheat ears and their water content

The laboratory measurements presented here are additional measurements to those performed on a wheat crop by an electrostatic quadrupole at 430 kHz. They give a first calibration for the correlation between water content and apparent dielectric permititivity of ears. These measurements are performed by means of a capacimeter or a plane condenser of which the apparent permittivity is determined Wheat ears are placed within the condenser and their permittivity is correlated to their water content. A theoretical approach (method of moments) presents the response of the condenser containing ears similated to a 3D parallelepipedic body in an electromagnetic field: (C) Academie des sciences/Elsevier, Paris.