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Theoretical formulation to evaluate capacitance for before and after touch point MEMS capacitive pressure sensors


Citation

Hezarjaribi, Yadollah and Hamidon, Mohd Nizar (2013) Theoretical formulation to evaluate capacitance for before and after touch point MEMS capacitive pressure sensors. The International Journal of Engineering and Science, 2 (1). pp. 278-286. ISSN 2319–1805; ESSN: 2319-1813

Abstract

Micro-electromechanical systems (MEMS) have received a great deal of attention in recent years. This is due to the great promise of increased miniaturization and Performance of MEMS devices over conventional devices. MEMS pressure sensors currently dominate the market for greater than atmospheric pressure sensors. In this paper, a theoretical and finite elements analysis (FEA) solution for Micro-electromechanical systems (MEMS) pressure sensor to evaluate capacitance for before and after touch point is proposed. By looking at MEMS devices, when the diaphragm starts touching the fixed electrode by applying loads, it will have a major effect on the overall of the capacitance. Therefore, one should consider the effect of touch mode capacitance value in the system to evaluate good linearity, large operating pressure range and large overload protection at output. As of so far the evaluation for capacitance value of touch point and after touch point has not been evaluated in the literatures. This paper presents the new analytical formula to approach for including the touch-down effect capacitance value of Microsystems. The proposed MEMS capacitive pressure sensor demonstrated diaphragm with radius of , the gap depth of and the sensor exhibit linear response with pressure from 0.01 Mpa to 1.7 Mpa.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Keywords: MEMS pressure sensor; Touch mode; Circular diaphragm
Depositing User: Nabilah Mustapa
Date Deposited: 16 Mar 2015 06:44
Last Modified: 07 Dec 2015 07:59
URI: http://psasir.upm.edu.my/id/eprint/28743
Statistic Details: View Download Statistic

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