Share Email Print
cover

Proceedings Paper

Development of ionic polymer transducers as flow shear stress sensors: effects of electrode architecture
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Ionomeric polymer transducers (IPTs) have recently received a great deal of attention. As actuators, IPT have the ability to generate large bending strain and moderate stress at low applied voltages. Although the actuation capabilities of IPTs have been studied extensively, the sensing performance of these transducers has not received much attention. The work presented herein aims to develop a wall shear stress sensor for aero/hydrodynamic and biomedical applications. Ionic polymers are generally created by an impregnation-reduction process in an ion exchange membrane, typically Nafion, and then coated with a flexible electrode. The traditional impregnation-reduction fabrication technique of IPTs has little control on the electrode thickness. However, the new Direct Assembly Process (DAP) for fabrication of IPTs allows for experimentation with varying conducting materials and direct control of electrode architecture. The thickness of the electrode is controlled by altering the amount of the ionomer/metal mix sprayed on the membrane. Transducers with varied electrode and membrane thicknesses are fabricated. The sensitivity of the transducer is characterized using two basic experiments. First, the electric impedance of the transducer is measured and its capacitive properties are computed. Earlier studies have demonstrated that capacitance has been strongly correlated to actuation performance in IPTs. Subsequently, the sensing capability of the IPTs in bending is measured using a fixed-pined cantilever configuration. Finally the shear stress sensing performance in fluid flow is quantified through a detailed calibration procedure. This is accomplished using two dynamic shear stress calibration apparatuses. In this study we demonstrate a strong correlation between the electrode thickness and the sensing performance of an IPT.

Paper Details

Date Published: 18 April 2007
PDF: 9 pages
Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 65290L (18 April 2007); doi: 10.1117/12.715841
Show Author Affiliations
David Griffiths, Virginia Polytechnic Institute and State Univ. (United States)
Justin Dominic, Virginia Polytechnic Institute and State Univ. (United States)
Barbar J. Akle, Virginia Polytechnic Institute and State Univ. (United States)
Lebanese American Univ. (Lebanon)
Pavlos P. Vlachos, Virginia Polytechnic Institute and State Univ. (United States)
Donald J. Leo, Virginia Polytechnic Institute and State Univ. (United States)
Defense Advanced Research Projects Agency (United States)


Published in SPIE Proceedings Vol. 6529:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007
Masayoshi Tomizuka; Chung-Bang Yun; Victor Giurgiutiu, Editor(s)

© SPIE. Terms of Use
Back to Top