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Proceedings Paper

Solid polymer electrolyte membrane flow sensor for tracheal tube
Author(s): Tadashi Ihara; Yoshito Ikada D.V.M.; Taro Nakamura; Toshiharu Mukai; Kinji Asaka
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Paper Abstract

Solid polymer electrolyte membrane (SPM) acts not only as an actuator but as a small, voltage generating, and fast response sensor. Sensing characteristics of SPM as applied to a flow sensor for a ventilator was studied. SPM was prepared by chemically plating with gold on the surface of Nafion membrane. A new technique using Nafion R-1100 resin was applied to fabricate SPM with an arbitrary thickness between 200-1000 μm. Flow sensing unit and signal amplifier was constructed to measure the induced voltage by bending SPM with air-flow from the ventilator. Induced voltage by SPM ranged 1-100 μV over a ventilator air-flow range of 20-100 L/min. SPM sensor showed linear increase of induced voltage by the increase of flow. This relationship was tested over a range of SPM thickness, length and width. The result was compared with an electro-mechanical coupling model of SPM transducer: data showed consistent result on the relation between the induced voltage and membrane length and thickness while a discrepancy was observed in the relation of membrane width and induced voltage. The result, however, was consistent with the assumption of capacitive component model.

Paper Details

Date Published: 30 March 2006
PDF: 8 pages
Proc. SPIE 6167, Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications, 61670U (30 March 2006); doi: 10.1117/12.658928
Show Author Affiliations
Tadashi Ihara, Suzuka Univ. of Medical Science (Japan)
Yoshito Ikada D.V.M., Suzuka Univ. of Medical Science (Japan)
Taro Nakamura, Suzuka Univ. of Medical Science (Japan)
Toshiharu Mukai, The Institute of Physical and Chemical Research (Japan)
Kinji Asaka, National Institute of Advanced Industrial Science and Technology (Japan)

Published in SPIE Proceedings Vol. 6167:
Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications
Daniele Inaudi; Wolfgang Ecke; Brian Culshaw; Kara J. Peters; Eric Udd, Editor(s)

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