Development of Flexible Wireless Wall Temperature Sensor for Combustion Studies

A polyimide-based flexible wireless wall temperature sensor has been proposed for unsteady wall temperature measurements of internal combustion (IC) engines. The sensor is equivalent to an LCR resonant circuit including a sensing capacitor and a planar coil, which is coupled with an external read-out coil. The temperature changes lead to shifts of the resonant frequency, which is determined with the dip in the phase angle of complex impedance....