Development of Flexible Wireless Wall Temperature Sensor for Combustion Studies
| Autor: | Taejin Kwan, Minhyeok Lee, Yuji Suzuki, Kenichi Morimoto, Shunichiro Hara |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Microelectromechanical systems
Materials science business.industry Capacitive sensing 010401 analytical chemistry 01 natural sciences Temperature measurement 0104 chemical sciences law.invention Cylinder (engine) 010309 optics Capacitor law Electromagnetic coil 0103 physical sciences Optoelectronics RLC circuit Electrical and Electronic Engineering business Instrumentation Electrical impedance |
| Zdroj: | IEEE Sensors Letters. 3:1-4 |
| ISSN: | 2475-1472 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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