誘導加熱調理器の超音波振動を用いた沸騰センシング手法の開発(機械力学,計測,自動制御)

概要

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Conventionally, induction heating (IH) cooking heaters use thermisistors to measure the temperature of a cooking vessel during operation; however, this is an indirect measurement and is dependent on the transfer of heat through the glass plate. To overcome this problem, some attempts have been made to identify the boiling of water though audible sound waves, but this approach can not be applied to Teflon^[○!R]-coated cooking vessels, while the use of infra-red sensors are expensive. In this paper, we propose a novel method for boiling detection, utilizing the ultrasonic vibrations generated by the induction heating process. As the temperature of the water increases towards the boiling point, the amplitude of the ultrasonic vibration of the cooking vessel continuously changes due to reflection from the generated steam bubbles. The boiling point can be quickly identified by continuously monitoring the change in amplitude. As a results of this work, detection of the boiling point can be performed within 30 seconds, which is faster than that of the conventional thermistor approach.
2010-02-25