Microwave thawing oven for pastries etc. - thawing food rapidly by heating centre with microwaves and cooling surface with cold air

摘要

The thawing oven passes a cold air stream over the pastry. The cold air is cooled in a conventional manner. The microwave radiation enters the oven via two opposing windows, and has the same phase and amplitude at both windows. The max. of the two radiation sources can be displaced by controlling phase and amplitude externally. The radiation sources are positioned such that a relatively uniform temp. increase occurs in the entire pastry except at its surface which is held at a relatively low temp. Part of the cold air is used to cool the microwave oscillator. Any absorbant parts likely to interfere with thawing are removed.