Ikuo Nishimoto

Spherical Wireless Temperature Sensor

A concept of a wireless temperature sensor using spherical semiconductor technology is proposed. It is a wireless, battery‐less and small spherical sensor. The sensor measures the temperature by a capacitor‐resistor (CR) oscillation circuit, and transmits the information by a “direct Q‐switch” through a 3D coil, which is wrapped around a spherical substrate. The total measurement system has successfully demonstrated by using a concept model. A prototype of the spherical wire‐less temperature sensor has been designed and is under development. Various applications for this sensor are expected in the field where installation of conventional sensors is difficult or impossible. This concept can cause a paradigm shift in conventional control systems by the features of wireless operation, small size and low cost.