Key result
Novel RF wrist sensor detects heart rate across a 2 mm gap from the skin.
A novel nonconstrained wrist pulse sensor using a 2.4 GHz RF resonator and PLL can successfully detect heart rate at a 2 mm distance from the skin.
In this paper, a nonconstrained wrist pulse sensor based on radio-frequency proximity coupling at 2.4 GHz is proposed. The proposed system consists of a voltage-controlled oscillator (VCO) combined with a planar resonator and a phase-locked loop (PLL). The resonator senses the distance variation from the skin occurring because of the wrist pulse and plays a role as a feedback element of the VCO. The oscillation frequency of the VCO varies due to the impedance variation of the resonator, and the PLL operates as a converter of the frequency variation to the DC output voltage variation. The measurement result verified that the proposed system can detect the heart rate in nonconctact and nonconstrained condition with 2 mm gap from the skin.
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Baek et al. (2021) studied Heart rate detection. Nonconstrained wrist pulse sensor based on RF proximity coupling at 2.4 GHz was evaluated on Heart rate detection in noncontact condition. A proposed nonconstrained wrist pulse sensor based on a 2.4 GHz RF resonator and PLL successfully detected heart rate in a noncontact condition with a 2 mm gap from the skin.
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