30 March 2006 Solid polymer electrolyte membrane flow sensor for tracheal tube
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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.
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Tadashi Ihara, Tadashi Ihara, Yoshito Ikada, Yoshito Ikada, Taro Nakamura, Taro Nakamura, Toshiharu Mukai, Toshiharu Mukai, Kinji Asaka, Kinji Asaka, } "Solid polymer electrolyte membrane flow sensor for tracheal tube", Proc. SPIE 6167, Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications, 61670U (30 March 2006); doi: 10.1117/12.658928; https://doi.org/10.1117/12.658928

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