Improved Power Control during Microwave Heating in Biological Applications

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  • MORI Toshiko
    Department of Prosthetic Dentistry, Faculty of Dentistry, The University of Sydney
  • THOMAS Graham
    Department of Prosthetic Dentistry, Faculty of Dentistry, The University of Sydney
  • MARKHAM Robert
    Department of Obstetrics and Gynaecology, Faculty of Medicine, The University of Sydney
  • WHITE Paul
    Industrial Microwave Applications (Aust) Pty, Ltd.

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Other Title
  • 生物利用におけるマイクロ波加熱出力のコントロール

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Abstract

The heating performance of prototype variable power control units attached to two domestic microwave ovens, 500W and 700W, was investigated. The units employed the phase control method where rated voltage was obtained by switching AC supply at a particular angular position on the sinusoidal voltage. In order to create experimental conditions employed in a previous study, Sydney tap water (50mL) was heated at a 10% power level in the 500W oven. Water boiled at 10min in both experiments. However, the precision and control of the heating was greatly improved with addition of the control unit. A disinfecting solution (50mL) and a tissue fixative (10mL) were included for experiments with the 700W oven. A power level of only 1% was sufficient to maintain the temperature of the fixative at low temperatures (30-40°C) where many biological reactions occur. The present results indicate that microwave heating power can be controlled by the variable power control method. This will make temperature control possible through the provision of an electronic feedback loop which links a thermocouple with the power control unit.

Journal

  • Dental Materials Journal

    Dental Materials Journal 11 (2), 197-203,219, 1992

    The Japanese Society for Dental Materials and Devices

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