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Design of a Wearable FBG-Based Sensor With High Sensitivity for Radial Artery Pulse Waveform Measurement
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DOI：10.1109/tim.2026.3717089.png)
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Abstract
En 中文
This article introduces a wearable fiber Bragg grating (FBG)-based sensor for high-sensitivity radial artery pulse waveform acquisition. To address the weak amplitude of radial artery pulse signals and the limited sensitivity of conventional force/displacement-based sensors, a compliant two-stage lever amplification mechanism with flexure hinges is designed to convert pulse-induced forces into uniform tensile strain on a suspended FBG. Finite element analysis is performed to evaluate structural performance and optimize key structural parameters. The fabricated sensor is experimentally calibrated using a commercial six-axis F/T sensor, achieving a sensitivity of 3130 pm/N, a resolution of 0.32 mN, and a measurement range of 0–2 N. Dynamic force loading and radial crosstalk experiments verify the sensor’s dynamic measurement accuracy. Human subject experiments demonstrate that the proposed sensor can acquire high-fidelity radial pulse waveforms with amplitudes up to 300 pm and resolve up to three characteristic peaks. Frequency-domain analysis further confirms its capability to extract heart rate information. It also shows close agreement with a commercial electrocardiogram (ECG) monitor with a maximum error of 0.8 %. These results demonstrate the feasibility of the proposed sensor for high-resolution radial pulse waveform acquisition.
Keywords:
Cardiovascular monitoring
fiber Bragg grating (FBG)
pulse waveform measurement
radial artery pulse
wearable sensor
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5.9
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1.9W
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5.8W
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