This paper presents the realization of antenna sensors on flexible textile substrates for bio-impedance measurements. A T-resonator technique was employed to characterize the dielectric constant of various textile materials and to evaluate how the human tissue, functioning as the superstrate, influence the effective dielectric constant. A single frequency antenna sensor was designed based on the measured dielectric constant and the effect of tissue on the antenna resonant frequency was characterized. Monitoring perspiration during exercise using the antenna sensor as well as wireless interrogation of the antenna sensor, when worn by a volunteer, was demonstrated. A rapid-prototyping technique for fabricating the T-resonator and the antenna sensor from conductive fabric or copper films is also presented.
Microstrip patch antenna sensors have been demonstrated for strain, temperature, crack, moisture sensing etc. These antenna sensors are attractive because of their simple configuration, low profile, and conformability. Most of these studies, however, were carried out in lab settings using a specialized microwave instrument, which is expensive and has a low interrogation speed. This paper presents the development of a low cost interrogation system that can dynamically interrogate the antenna sensor and wirelessly transmit the acquired data to a smart device. The hardware implementation of the interrogation system as well as it characterization using a test apparatus imitate a prosthetic socket are presented. We demonstrated that the interrogation system can extract the resonant frequencies of the antenna sensors at real time.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.