This paper presents the concept, design and development of a novel flexible pressure sensitive mat using infrared proximity sensors and a compressible material layer. The system consists of sensors arranged in a matrix, on a flexible printed circuit board, covered with an elastic layer of silicone rubber including a cavity for each individual sensor. Finite element simulations suggest a linear deformation with increasing applied pressure. Experiments on a prototype implementation confirm these results and illustrate a linear response with low noise. Finally, it is demonstrated that the system is able to recover breathing rate, indicating its suitability for patient monitoring applications.

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Keywords breathing rate, measurement, Pressure Sensitive Mat, proximity sensor
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Conference 2018 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2018
Selzler, R. (Roger), Green, J.R. (James R.), Goubran, R, & Knoefel, F. (2018). Developing a pressure sensitive mat using proximity sensors for vital sign monitoring. In I2MTC 2018 - 2018 IEEE International Instrumentation and Measurement Technology Conference: Discovering New Horizons in Instrumentation and Measurement, Proceedings (pp. 1–5). doi:10.1109/I2MTC.2018.8409859