1. Effects of inner materials on the sensitivity and phase depth of wireless inductive pressure sensors for monitoring intraocular pressure
- Author
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Kwang-Seok Yun, Mi Jeung Kim, Soo Hyun Lee, Kyeong-Sik Shin, Cheol-In Jang, Ji Yoon Kang, and Ki Ho Park
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,0206 medical engineering ,02 engineering and technology ,021001 nanoscience & nanotechnology ,020601 biomedical engineering ,Pressure sensor ,law.invention ,Inductance ,Capacitor ,Pressure measurement ,law ,Electromagnetic coil ,Ferrite (magnet) ,Inductive sensor ,Composite material ,0210 nano-technology ,Relative permeability - Abstract
In this research, we developed wireless, inductive, pressure sensors with high sensitivity and investigated the effects of the inner materials (copper or ferrite) on the performance of the sensors. The proposed sensor is comprised of two parts, i.e., the top and the bottom parts. The top part includes a micro coil and a capacitor for the wireless transfer of data, and the bottom part includes the inner materials and a thick or thin flexible membrane to induce changes in the inductance. An anchor is used to assemble the top and bottom parts. The behavior of the sensor with copper was based on the eddy current effect, and, as the pressure increased, its resonance frequency increased, while its phase depth decreased exponentially. The principle of the sensor with ferrite was related to the effective permeability between a ferrite and a coil, and its response was the opposite of that with copper, i.e., as the pressure increased, the resonance frequency decreased linearly, and the phase depth increased linearl...
- Published
- 2016