The singlemode-multimode-singlemode (SMS) fiber structure for a heart rate monitoring is proposed and developed. An artificial electrocardiogram (ECG) signal is used to simulate the heart pulse at different rates ranging from 50 beats per minute (bpm) to 200 bpm. The SMS fiber structure is placed at the center of a loudspeaker and it senses the vibration of the pulse. The vibration of the pulse signal applied to the SMS fiber structure changes the intensity of the optical output power. The proposed sensor shows a linear frequency of the heart rate sensing range that matches well with the relevant heart rate from the artificial ECG. This work shows the capability of the SMS fiber structure monitoring the heart rate frequencies for a long term, high stability realization, and reproducibility, and being suitable for the observation in hospitals as well as in other environments.

中文翻译：

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基于单模-多模-单模光纤的心率监测传感器

提出并开发了用于心率监测的单模多模单模（SMS）光纤结构。人工心电图（ECG）信号用于以每分钟50次搏动（bpm）至200 bpm的不同速率模拟心脏脉冲。SMS纤维结构位于扬声器的中央，它可以感应脉冲的振动。施加到SMS光纤结构上的脉冲信号的振动会改变光输出功率的强度。提出的传感器显示的心率感应范围的线性频率与人工ECG的相关心率很好地匹配。这项工作显示了SMS纤维结构能够长期监测心率频率，实现高稳定性和可重复性的能力，