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Sensors 2015, 15(9), 22692-22704; doi:10.3390/s150922692

Design and Application of a High Sensitivity Piezoresistive Pressure Sensor for Low Pressure Conditions

1
College of Computer Science and Technology, Nanjing Tech University, No.30, South Puzhu Road, Pukou District, Nanjing, 211800, China
2
Key Laboratory of MEMS of the Ministry of Education, Southeast University, No.2 Sipailou, Xuanwu District, Nanjing 210096, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 21 July 2015 / Accepted: 31 August 2015 / Published: 8 September 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1734 KB, uploaded 8 September 2015]   |  

Abstract

In this paper, a pressure sensor for low pressure detection (0.5 kPa–40 kPa) is proposed. In one structure (No. 1), the silicon membrane is partly etched to form a crossed beam on its top for stress concentration. An aluminum layer is also deposited as part of the beam. Four piezoresistors are fabricated. Two are located at the two ends of the beam. The other two are located at the membrane periphery. Four piezoresistors connect into a Wheatstone bridge. To demonstrate the stress concentrate effect of this structure, two other structures were designed and fabricated. One is a flat membrane structure (No. 2), the other is a structure with the aluminum beam, but without etched silicon (No. 3). The measurement results of these three structures show that the No.1 structure has the highest sensitivity, which is about 3.8 times that of the No. 2 structure and 2.7 times that of the No. 3 structure. They also show that the residual stress in the beam has some backside effect on the sensor performance. View Full-Text
Keywords: piezoresistive; pressure sensor; stress concentration; low pressure piezoresistive; pressure sensor; stress concentration; low pressure
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. (CC BY 4.0).

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Yu, H.; Huang, J. Design and Application of a High Sensitivity Piezoresistive Pressure Sensor for Low Pressure Conditions. Sensors 2015, 15, 22692-22704.

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