Intraocular Pressure Sensor Based on Flexible Sensing Technology

Real-time intraocular pressure (IOP) nondestructive testing (NDT) plays an irreplaceable role in many fields, and the core of the technology is to build a high-performance IOP sensor. In order to fill the gap of portable real-time IOP monitoring equipment in the industry, a kind of IOP sensor based on flexible sensing technology is developed in this paper. In this paper, the Wheatstone bridge IOP sensor is prepared by using laser marking and face to face water transfer technology, and the signal is collected by NFC chip (NHS 3152, NXP) and transmitted to mobile phone APP through antenna for wireless communication. The performance of the IOP sensor reached the sensitivity of 3.1mV/mmHg in the pressure rise stage and 2.8274mV/mmHg in the descending stage. The linear correlation between the two stages was very strong, and the linearity R2 was as high as 0.99698. The performance showed the same effect in the test of pig eye in vitro. The results of performance comparison show that the sensor can maintain good performance under more complex IOP fluctuations, and the optimal power supply form is determined. The sensor has passed the biological activity test and meets the current scientific research and commercial standards in the industry.