The knowledge of the electric and thermic behaviour of a microwave oven is essential both for the designer and for the user. The former needs to know resonant frequencies and input impedance of the cavity in both situations, empty oven and filled with food, to realize a good matching between source (magnetron) and load. The latter needs to know temperature distribution inside the food to keep under control proteic degradation and/or to assure a complete food pasteurization and sterilization. The TLM method proves to be the most efficient; in the present contribution the method has been used to evaluate resonant frequencies of a commercial microwave oven, empty and filled with a phantom simulating the dielectric characteristics of a biological tissue; moreover the electric field distribution inside the phantom has been obtained. Theoretical results have been compared with experimental measurements performed by a vector network analyzer and infrared thermography obtaining a good agreement.
TLM Techniques in Microwave Ovens Analysis: Numerical and Experimental Results / De Leo, R.; Cerri, G.; Mariani Primiani, V.. - In: IEE CONFERENCE PUBLICATION. - ISSN 0537-9989. - 350:(1991), pp. 361-364. (Intervento presentato al convegno International Conference on Computation in Electromagnetics tenutosi a London, Engl, nel 1991).
TLM Techniques in Microwave Ovens Analysis: Numerical and Experimental Results
R. De Leo;G. Cerri;V. Mariani Primiani
1991-01-01
Abstract
The knowledge of the electric and thermic behaviour of a microwave oven is essential both for the designer and for the user. The former needs to know resonant frequencies and input impedance of the cavity in both situations, empty oven and filled with food, to realize a good matching between source (magnetron) and load. The latter needs to know temperature distribution inside the food to keep under control proteic degradation and/or to assure a complete food pasteurization and sterilization. The TLM method proves to be the most efficient; in the present contribution the method has been used to evaluate resonant frequencies of a commercial microwave oven, empty and filled with a phantom simulating the dielectric characteristics of a biological tissue; moreover the electric field distribution inside the phantom has been obtained. Theoretical results have been compared with experimental measurements performed by a vector network analyzer and infrared thermography obtaining a good agreement.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
