A silicon carbide capacitive pressure sensor for in-cylinder pressure measurement
| Autor: | Li Chen, M. Mehregany |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Materials science
business.industry Capacitive sensing Metals and Alloys Electrical engineering Condensed Matter Physics Pressure sensor Capacitance Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Surface micromachining chemistry Cylinder head Internal combustion engine Silicon carbide Optoelectronics Electrical and Electronic Engineering Combustion chamber business Instrumentation |
| Zdroj: | Sensors and Actuators A: Physical. :2-8 |
| ISSN: | 0924-4247 |
| DOI: | 10.1016/j.sna.2007.09.015 |
| Popis: | This paper reports a research prototype of a low-cost, miniature, mass-producible sensor for measurement of high-pressure at operating temperatures of 300–600 °C, e.g., in-cylinder engine pressure monitoring applications. This all-silicon carbide (SiC) capacitive sensor, i.e., a SiC diaphragm on a SiC substrate, takes advantage of the excellent harsh-environment material properties of SiC and is fabricated by surface micromachining. The sensor is packaged in a high-temperature ceramic package and characterized under static pressures of up to ∼5 MPa (700 psi) and temperatures of up to 574 °C in a custom chamber. An instrumentation amplifier integrated circuit is used to convert capacitance into voltage for measurements up to 300 °C; beyond 300 °C, the capacitance is measured directly from an array of identical sensor elements using a LCZ meter. After high-temperature soaking and several tens of temperature/pressure cycles, packaged sensors continue to show stable operation. For monitoring the dynamic cylinder pressure in the combustion chamber, the sensor is packaged in a custom probe and inserted into the cylinder head of a research internal combustion engine. The sensor efficacy is verified against the reference probe used for monitoring pressure in the research engine. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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