The Detection of Small Inductance Changes by Synchronized Chaotic Oscillators

• Published in: 2019 International Multi-Conference on Engineering, Computer and Information Sciences (SIBIRCON) pp. 0120 - 0124
• Main Authors: Karimov, Timur, Butusov, Denis, Karimov, Artur, Druzhina, Olga, Khalyasmaa, Alexandra
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-10-2019
• Subjects: chaotic oscillators; human-computer interaction; inductive sensing; unidirectional synchronization
• DOI: 10.1109/SIBIRCON48586.2019.8958110

There are different types of human-wearable sensors which work on the inductance measurement principle: inductive coil sensors for heart activity monitoring, respiratory inductive plethysmographs, posture detectors, etc. The increase of sensitivity and reliability of these sensors is vital in different applications, including medical and recreational. Development of IoT and human-computer interaction technologies makes this demand more urgent. In this paper, we propose a novel inductance measurement method based on a couple of synchronized chaotic oscillators to solve the problem of small inductance changes detection. It is known that chaotic systems are very sensitive to parameters variation and therefore can be used to construct sensing devices. Our approach assumes the application of two oscillators: sensing and stable, and implements unidirectional synchronization. One of the oscillators contains a sensing coil as an inductive component of its circuit. Information about the measured parameter is obtained through the analysis of synchronization error between two oscillators. It is shown that this error grows faster than in the case of synchronized harmonic oscillators. Physical prototyping shows a high level of conformity between theory, simulation and experimentation. We can conclude that the proposed approach can be applied to the construction of human-wearable sensors, having high sensitivity and simple, cheap and reliable construction.