Seite - 34 - in Adaptive and Intelligent Temperature Control of Microwave Heating Systems with Multiple Sources

2. IntroductionofHEPHAISTOS 3 0 4 0 3 0 4 0 3 0 4 5 3 0 4 5 0 1 0 0 2 0 0 3 0 00 2 0 4 0 T 1 f r o m F O S T 2 f r o m F O S T 1 f r o m I R C T 2 f r o m I R C T i m e ( s ) P o w e r Figure2.17. Comparison of measurement delays using the fiber optic sensor (FOS)andthe infraredcamera (IRC). difficulties toboththecontrolof thesystemandthetemperaturemea- surement. There is no way to eliminate or reduce its influences from neitherhardwarenormodelingaspects. The above mentioned problems of thermocouples and fiber optic sen- sors can be easily overcome by the infrared camera. The temperature measurementusingtheinfraredcameraiscontactless,anditcanbedi- rectlyimplementedwithoutanyadditionalprocessing. Asalsoshown in figure 2.17, the time delay of the infrared camera is so small that canbeneglectedinpractice. Theonlydifficultyregardingtheinfrared camera is the temperaturemismatchcausedbythemetallicmeshthat isput inbetweenthecameraandthecavity. 34