Seite - IX - in Adaptive and Intelligent Temperature Control of Microwave Heating Systems with Multiple Sources

ListofFigures 1.1. Temperatureprofile comparison between conventional (left)andmicrowave(right)heating. . 2 1.2. Diagrams of two different temperature control approaches. . . . . . . . . . . . . . . . . . . . 11 2.1. Induction heating system[RLCB02]. . . . . . . . . . 16 2.2. Dipole polarizationof dielectric. . . . . . . . . . . . 18 2.3. Amplitudes ofε′andε′′atdifferent frequencies [Met96]. . . . . . . . . . . . . . . . . . . 19 2.4. Effective loss factordue to the dipole relaxationandthe ionic conduction losses [Met96]. . 21 2.5. ComparisonbetweenHEPHAISTOS(a)and anautoclave (b). . . . . . . . . . . . . . . . . . . . . . 22 2.6. Schematicsetup ofHEPHAISTOS [Feh09]. . . . . . 22 2.7. Structures ofa normalmicrowave heatingsystem. . 23 2.8. Powerversus frequency performanceof different solid-statedevices and microwave tubes [Tre05]. . . . . . . . . . . . . . . . . . . . . . . . 24 2.9. PhotosofMagnetronused in practice (a)and its cross-section (b). . . . . . . . . . . . . . . . . . . . 25 2.10. Powersupplies used in the newly updated HEPHAISTOS cavity 3. . . . . . . . . . . . . . . . . . 25 2.11. Hollowmetalwaveguides [web]. . . . . . . . . . . . 26 2.12. TheWR-340 waveguide (a)andslotted waveguide (b)used inHEPHAISTOS . . . . . . . . 27 2.13. Cross sectionstructure ofHEPHAISTOS. . . . . . . 30 2.14. Diagram of the process control system. . . . . . . . . 31 2.15. Labview based control interface. . . . . . . . . . . . 32 2.16. Remotecontrol interface ofHEPHAISTOS. . . . . . 32 ix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .