Patent ID: 7520667
Filing Date: 2009-04-21
Classification: H05B

Abstract:
1. Method of determining a set of process parameters of a treatment unit in which unit a product is subjected to a temperature treatment, the method comprising: providing a product, subjecting said product to a temperature treatment in a treatment unit, subjecting said product to a transmitted electromagnetic signal before, during and/or after said temperature treatment, wherein said transmitted electromagnetic signal is adapted to interact with said product, the product having a dielectric constant distribution and wherein said transmitted electromagnetic signal interacts with said product dependent upon the dielectric constant distribution of said product, subjecting said product to a second signal providing a local change, in time and position, of the dielectric constant distribution of said product, providing an interference between the second signal and the transmitted electromagnetic signal as the transmitted electromagnetic signal interacts with the product being subjected to said local, in time and position, change of the dielectric constant distribution, receiving an electromagnetic signal which has interacted with said product, analysing the received electromagnetic signal in comparison with the transmitted electromagnetic signal to determine a response dependent upon the dielectric constant distribution of said product and based on said response determine the temperature distribution of said product or the temperature in a predetermined location of said product or a water content of the product, and analysing said temperature distribution, temperature or water content of said product or a plurality of said products and based thereupon determining a set of process parameters for a temperature treatment in a treatment unit.