Blink reading monitoring system using magnetic properties of ferrofluid

The object of the study is an eye movement monitoring system based on a combination of a permanent magnet, ferrofluid and glasses with built-in inductive sensors. In the current conditions of development of wearable technologies and biomedical devices, such a system has the potential for application in medicine, in particular for monitoring eye movements in real time, which can be useful for diagnostics and rehabilitation. The problem considered in the study is to create a compact, comfortable and accurate system for non-contact monitoring of the frequency and nature of blinking. The main attention is paid to optimizing the design of the eyeglass frame with built-in coils, as well as the development of algorithms for collecting and processing induced signals, which allows for effective detection of eye movements without discomfort for the user. The essence of the results obtained is the development of a wearable system that uses ferrofluid applied to false eyelashes and magnetic coils built into a 3D-printed eyeglass frame. Experimental tests demonstrated the system’s ability to clearly distinguish between slow and fast blinking based on induced signals obtained using an Arduino Uno board with a reading frequency of 200 Hz. It was found that the amplitude of the signals during fast blinking is significantly higher, which ensures reliable tracking of eye movements in different modes. The results are explained by the innovative combination of a contactless magnetic sensor with a liquid form of ferrofluid, which ensures flexibility, comfort and invisibility of the system. Coils built into the frame allow for amplification of the induction signal, reducing the impact of noise and improving data quality. The use of a 3D model of the frame optimized for coil fixation ensures design reliability and repeatability of the results. The innovation of the approach lies in the combination of advanced materials and 3D printing technologies with traditional electronic solutions to create a compact and convenient eye movement monitoring device. The proposed system is a promising tool for further application in medical, rehabilitation and interface technologies, where precise control of blinking is critically important.