ハイパワーセンサの電子レンジへの適用　冷凍食品の解凍検出

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タイトル別名
  • Application of High Power Sensor to Microwave Oven. Defrosting Detection of Frozen Foods.
  • ハイ パワー センサ ノ デンシ レンジ エ ノ テキヨウ レイトウ ショクヒ
  • Defrosting Detection of Frozen Foods
  • 冷凍食品の解凍検出

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Foods have different dielectric properties which depend on the frozen and defrosted condition. As a frozen food is heated by a microwave oven for defrosting, its dielectric property varies with temperature. Consequently, the microwave reflection coefficient in the feed waveguide connected to the oven cavity also varies with temperature. We suggest to detect the reflection coefficient using a loop coupling directional coupler. The coupling characteristics of the loop coupling directional coupler was analyzed, and the directional coupler was designed according to the results obtained from the analysis and formed on a glass base-epoxy resin laminate. Measuring the frequency characteristics of the coupler, we obtained the coupling coefficient of 43.6dB and the directivity of 20.6dB at 2450MHz. The coupling coefficient and the directivity were sufficient for the measurement of the reflection coefficient from microwave oven. We named this loop coupling directional coupler "High Power Sensor". We inserted mushed potato used as a sample food into a waveguide excited by microwave power of 300W for heating. Using the High Power Sensor attached to a wall on the waveguide, we measured the reflection coefficient from the mushed potato heated from -20°C to 10°C. As a result, it was found that the minimum reflection coefficient existed in the range of temperature from -5°C to 0°C well known as the optimum defrosting condition for cooking. Further, we have developed a microwave oven with defrosting function using the High Power Sensor and tried to detect the optimum defrosting condition for various frozen foods. As a result, we confirmed that the optimum defrosting conditions of the various foods for cooking can be detected by the High Power Sensor.

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