Abstract: In response to the growing demand for in situ measurement of pressure in high-temperature environments, a high temperature capacitive pressure sensor is presented in this paper. A high-temperature ceramic material-alumina is used for the fabrication of the sensor, and the prototype sensor consists of an inductance, a variable capacitance, and a sealed cavity integrated in the alumina ceramic substrate using a thick-film integrated technology. The experimental results show that the proposed sensor has stability at 850 °C for more than 20 min. The characterization in high-temperature and pressure environments successfully demonstrated sensing capabilities for pressure from 1 to 5 bar up to 600 °C, limited by the sensor test setup. At 600 °C, the sensor achieves a linear characteristic response, and the repeatability error, hysteresis error and zero-point drift of the sensor are 8.3%, 5.05% and 1%, respectively.
Keywords: high-temperature pressure sensor; in situ test; alumina ceramic; LC circuit
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Tan, Q.; Li, C.; Xiong, J.; Jia, P.; Zhang, W.; Liu, J.; Xue, C.; Hong, Y.; Ren, Z.; Luo, T. A High Temperature Capacitive Pressure Sensor Based on Alumina Ceramic for in Situ Measurement at 600 °C. Sensors 2014, 14, 2417-2430.
Tan Q, Li C, Xiong J, Jia P, Zhang W, Liu J, Xue C, Hong Y, Ren Z, Luo T. A High Temperature Capacitive Pressure Sensor Based on Alumina Ceramic for in Situ Measurement at 600 °C. Sensors. 2014; 14(2):2417-2430.
Tan, Qiulin; Li, Chen; Xiong, Jijun; Jia, Pinggang; Zhang, Wendong; Liu, Jun; Xue, Chenyang; Hong, Yingping; Ren, Zhong; Luo, Tao. 2014. "A High Temperature Capacitive Pressure Sensor Based on Alumina Ceramic for in Situ Measurement at 600 °C." Sensors 14, no. 2: 2417-2430.