ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Non Invasive Sensor for Continuous Intraocular Pressure Monitoring

Shujing Su, Lei Zhang, Gao Fei, Lei Fan, Helei Dong, Qiulin Tan, Jijun Xiong, and Sanmin Shen

(Received June 21, 2018; Accepted October 22, 2018)

Keywords: IOP, LC resonant, inductor coils, PDMS, MEMS

Pathological elevated intraocular pressure (IOP) is a primary index for glaucoma. In this paper, we present a biocompatible IOP sensor that operates based on the principle of inductor-capacitor (LC) resonance. The IOP sensor is composed solely of a spiral inductor that can sense deformations of corneal curvature. The inductor is fabricated by embedding gold coils into polydimethylsiloxane (PDMS), a soft, biologically compatible material, via MEMS technology. The resonant frequency of the sensor is designed to vary when the IOP is changed in experiments. The frequency response of the sensor was tested using a model eye, a tube, and a network analyzer. The results showed that there is approximately linearity between the frequency response of the sensor and the IOP. The sensitivity of the sensor was 417.29 kHz/mmHg, when the pressure ranged from 7.5 to 36.88 mmHg. Consequently, unstable IOP could be accurately tracked, using the calibrated relationship between frequency response and IOP.

Corresponding author: Qiulin Tan




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