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Journal of Micro/Nanolithography, MEMS, and MOEMS

Silicon-on-insulator out-of-plane electrostatic actuator with in situ capacitive position sensing
Author(s): Jiankun Wang; Zhenchuan Yang; Guizhen Yan
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Paper Abstract

An out-of-plane electrostatic comb actuator with in situ capacitive position sensing is presented. Asymmetrical vertical combs are used as the comb drives and in differential out-of-plane position sensing capacitors. A spring which can realize out-of-plane translational displacement of high-aspect-ratio structures was designed and analyzed both analytically and numerically. A robust silicon-on-insulator (SOI) process was proposed and verified to successfully fabricate the actuator with asymmetrical combs. The in situ capacitive position sensing capability was realized by the integrated out-of-plane sensing capacitors, and calibrated with the gravity as an acceleration reference. Treated as an accelerometer, the scale factor and nonlinearity of the actuator are evaluated to be 93.4 mV/g and 0.03%, respectively, with the input range of ±1 g. The tested static out-of-plane displacement ranges from -0.88 to 1.39 μm when the actuator is placed horizontally, and -1.16 to 1.25 μm when placed vertically, both with the supply voltage of 12 volts.

Paper Details

Date Published: 19 July 2012
PDF: 9 pages
J. Micro/Nanolith. MEMS MOEMS 11(3) 033006 doi: 10.1117/1.JMM.11.3.033006
Published in: Journal of Micro/Nanolithography, MEMS, and MOEMS Volume 11, Issue 3
Show Author Affiliations
Jiankun Wang, Peking Univ. (China)
Zhenchuan Yang, Peking Univ. (China)
Guizhen Yan, Peking Univ. (China)

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