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Two dimensional polymer-embedded quasi-distributed FBG pressure sensor for biomedical applications.

George T Kanellos¹, George Papaioannou, Dimitris Tsiokos

¹Department of Informatics, Aristotle University of Thessaloniki, Thessaloniki, Greece. kanellos@csd.auth.gr

|February 23, 2010

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We developed a flexible optical fiber pressure sensor for biomedical use. This wearable sensor accurately measures skin pressure, offering a portable solution for various healthcare applications.

Area of Science:

Biomedical Engineering
Materials Science
Optical Sensing

Background:

Accurate and non-invasive pressure monitoring is crucial for various biomedical applications.
Existing pressure sensors often lack the flexibility, portability, or skin-like mechanical properties required for seamless integration with the human body.

Purpose of the Study:

To develop a flexible, 2D optical fiber-based pressure sensing surface for biomedical applications.
To create a sensor system with high sensitivity, spatial resolution, and portability for real-time human skin pressure measurements.

Main Methods:

Fabrication of a 2x2 cm(2) sensing pad using Fiber Bragg Grating (FBG) elements embedded in a thin polymer sheet.
Integration of the sensor pad with a compact, commercially available interrogation unit.

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Characterization of the sensor's mechanical properties (skin-like behavior) and operational performance (sensitivity, resolution, hysteresis, real-time response).

Main Results:

The developed sensor pad has a minimal thickness of 2.5mm and is expandable for larger surfaces.
The system demonstrated a maximum fractional pressure sensitivity of 12 MPa(-1) with a spatial resolution of 1x1cm(2).
The sensor exhibited no hysteresis and operated in real-time, with mechanical properties matching human skin.

Conclusions:

The flexible optical fiber pressure sensor meets the requirements for human skin pressure measurements in diverse biomedical fields.
The sensor's portability, sensitivity, and skin-like properties make it suitable for applications such as amputee sockets, wearable devices, and patient monitoring systems.