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Sensors 2012, 12(6), 8026-8038; doi:10.3390/s120608026

An Annular Mechanical Temperature Compensation Structure for Gas-Sealed Capacitive Pressure Sensor

1,* , 1,2
1 Maenaka Human-Sensing Fusion Project, JST, Shosha 2167, Himeji, Hyogo 671-2280, Japan 2 School of Mechanical Engineering and Automation, Beihang University, Xueyuan Road No. 37, Haidian District, Beijing 100191, China 3 Micro-Nano Structure Device Integrated Research Center, Kagawa University, Takamatsu, Kagawa 761-0396, Japan 4 Department of Electrical Engineering and Computer Science, University of Hyogo, Himeji, Hyogo 671-2280, Japan
* Author to whom correspondence should be addressed.
Received: 24 April 2012 / Revised: 2 May 2012 / Accepted: 4 June 2012 / Published: 11 June 2012
(This article belongs to the Section Physical Sensors)
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A novel gas-sealed capacitive pressure sensor with a temperature compensation structure is reported. The pressure sensor is sealed by Au-Au diffusion bonding under a nitrogen ambient with a pressure of 100 kPa and integrated with a platinum resistor-based temperature sensor for human activity monitoring applications. The capacitance-pressure and capacitance-temperature characteristics of the gas-sealed capacitive pressure sensor without temperature compensation structure are calculated. It is found by simulation that a ring-shaped structure on the diaphragm of the pressure sensor can mechanically suppress the thermal expansion effect of the sealed gas in the cavity. Pressure sensors without/with temperature compensation structures are fabricated and measured. Through measured results, it is verified that the calculation model is accurate. Using the compensation structures with a 900 μm inner radius, the measured temperature coefficient is much reduced as compared to that of the pressure sensor without compensation. The sensitivities of the pressure sensor before and after compensation are almost the same in the pressure range from 80 kPa to 100 kPa.
Keywords: pressure sensor; mechanical temperature compensation; gas-sealed pressure sensor; mechanical temperature compensation; gas-sealed
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hao, X.; Jiang, Y.; Takao, H.; Maenaka, K.; Higuchi, K. An Annular Mechanical Temperature Compensation Structure for Gas-Sealed Capacitive Pressure Sensor. Sensors 2012, 12, 8026-8038.

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