During operation of a microwave oven, steps are taken to determine whether the oven is being operated in the absence of food therein and to shut down the oven if that state is found to exist. Initially, a high frequency detector disposed in the cooking chamber absorbs high frequency and produces heat...http://www.google.fr/patents/US5550355?utm_source=gb-gplus-shareBrevet US5550355 - Microwave oven driving control method and apparatus thereof
Microwave oven driving control method and apparatus thereof
