Xiang Siheng, You Hui, Miao Xinxiang, Niu Longfei, Yao Caizhen, Jiang Yilan, Zhou Guorui
Department of Engineering Optics, Research Center of Laser Fusion CAEP, Mianyang 621900, China.
Sensors (Basel). 2021 Nov 9;21(22):7437. doi: 10.3390/s21227437.
Stretchable optical fiber sensors (SOFSs), which are promising and ultra-sensitive next-generation sensors, have achieved prominent success in applications including health monitoring, robotics, and biological-electronic interfaces. Here, we report an ultra-sensitive multi-functional optical micro/nanofiber embedded with a flexible polydimethylsiloxane (PDMS) membrane, which is compatible with wearable optical sensors. Based on the effect of a strong evanescent field, the as-fabricated SOFS is highly sensitive to strain, achieving high sensitivity with a peak gauge factor of 450. In addition, considering the large negative thermo-optic coefficient of PDMS, temperature measurements in the range of 30 to 60 °C were realized, resulting in a 0.02 dBm/°C response. In addition, wide-range detection of humidity was demonstrated by a peak sensitivity of 0.5 dB/% RH, with less than 10% variation at each humidity stage. The robust sensing performance, together with the flexibility, enables the real-time monitoring of pulse, body temperature, and respiration. This as-fabricated SOFS provides significant potential for the practical application of wearable healthcare sensors.
可拉伸光纤传感器（SOFSs）是很有前景的超灵敏下一代传感器，在健康监测、机器人技术和生物电子接口等应用中取得了显著成功。在此，我们报告一种嵌入柔性聚二甲基硅氧烷（PDMS）膜的超灵敏多功能光学微/纳米光纤，它与可穿戴光学传感器兼容。基于强倏逝场效应，所制备的SOFS对应变高度敏感，峰值应变系数达到450，实现了高灵敏度。此外，考虑到PDMS的大负热光系数，实现了30至60°C范围内的温度测量，响应为0.02 dBm/°C。此外，通过0.5 dB/%RH的峰值灵敏度证明了对湿度的宽范围检测，每个湿度阶段的变化小于10%。强大的传感性能以及灵活性使得能够实时监测脉搏、体温和呼吸。这种所制备的SOFS为可穿戴医疗传感器的实际应用提供了巨大潜力。
