Abstract
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. The 1 mm-square sensing capacitor consists of suspended interdigitated electrodes sandwiched by two Al2O3 layers, which is fabricated using the microelectromechanical systems processes on a polyimide substrate. The cylinder wall temperature in an IC engine is measured with a 1.2 ms time interval. Due to the high sensitivity and quality factor of –15.1 kHz/°C and 120, accuracy of the unsteady temperature measurement up to 0.2 °C has been achieved. It is demonstrated that 137 temperature data are obtained in a single engine cycle at a rotational frequency of 730 r/min.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.