Photonic sensor with radio frequency power detection for body pressure monitoring

Abstract

A photonic sensor with radio frequency (RF) power detection for body pressure monitoring is proposed. The sensor based on two fiber Bragg gratings (FBGs) can transfer the wavelength shift to the change of RF power. The pressure can be measured by modulating and processing one single frequency RF signal. The theoretical analysis and experimental results of the photonic sensor are presented and discussed. The pressure sensitivities are acquired with 2.62×10⁻⁵ mW/kPa at 2.14 GHz, 2.46×10⁻⁵ mW/kPa at 2.21 GHz, 2.81×10⁻⁵ mW/kPa at 2.37 GHz, and 3.02×10⁻⁵ mW/kPa at 2.45 GHz, respectively. Furthermore, the pressure measurements of pressed body parts are also obtained by the sensor.

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