Analysing the composition of the content of a container by measuring the complex dielectric properties at plural frequences selected from the range of several Hz to plural Ghz and by measuring additionally at least one further physical quantity like the mass of the container with its content

摘要

The device for analyzing a composition contained in a container, comprises a unit (40) for transmitting or receiving an electromagnetic field with several frequencies, a supporting unit (20) for the container adapted to ensure a constant positioning between the receiving or transmitting units and the container, a unit for measuring complex impedance of the receiving or transmitting units influenced by a load constituted by the container representing complex dielectric characteristics of the container and its contents, and a unit for obtaining an additional physical data. The device for analyzing a composition contained in a container, comprises a unit (40) for transmitting or receiving an electromagnetic field with several frequencies, a supporting unit (20) for the container adapted to ensure a constant positioning between the receiving or transmitting units and the container, a unit for measuring complex impedance of the receiving or transmitting units influenced by a load constituted by the container representing complex dielectric characteristics of the container and its contents, a unit for obtaining an additional physical data relative to the characteristics of the container, and a unit (50) to provide information relating to the nature of the contents of the container according to the measured complex impedance. The additional physical data obtaining unit comprises a gravimetric sensor (53) for measuring mass of the container and its contents, and a data capture unit (55). The gravimetric sensor is provided under the supporting unit. Defects of the device are periodically measured by the sensor when the container is not introduced in the supporting unit. The presence of the container on the support is measured by the complex impedance measuring unit. The information providing unit comprises a unit for marking amplitude of the measured complex impedance in function of the measured mass, for comparing the marked complex impedance with predetermined value and for generating an alarm when the measured impedance value differs from the predetermined value. The additional physical data comprises a capacity of the container, a material such as plastic or glass constituting the wall of the container and/or the thickness of the wall of the container.