Photonics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China.
Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, 510275, China.
Sci Rep. 2020 Apr 7;10(1):6002. doi: 10.1038/s41598-020-62887-y.
This study reports a method for humidity sensing based on a specialty microstructured optical fiber (MOF). A suspended tri-core MOF was fabricated using the stack and draw technique. A low finesse sensing head was prepared by depositing a chitosan polymer matrix within the holes of the MOF, forming a Fabry-Pérot interferometer as a sensing platform while the chitosan film acts as the sensing material. The use of the probe for real-time breath monitoring was also successfully demonstrated. The probe possessed a maximum sensitivity of 81.05 pm/(%RH) for 90-95%RH range while the linear region of the sensor ranged from 70-95%RH. The temperature cross correlation was also experimented, and a lower influence of external temperature was observed. The probe shows an ultrafast response during human breath monitoring with a rising time and recovery time of 80 ms and 70 ms, respectively.
本研究报告了一种基于特种微结构光纤（MOF）的湿度传感方法。采用堆叠和拉伸技术制造了悬空三芯 MOF。通过在 MOF 的孔内沉积壳聚糖聚合物基质，制备了低菲涅耳数传感头，形成了 Fabry-Pérot 干涉仪作为传感平台，而壳聚糖膜则作为传感材料。还成功演示了探头用于实时呼吸监测的用途。该探头在 90-95%RH 范围内的最大灵敏度为 81.05 pm/（%RH），而传感器的线性区域范围为 70-95%RH。还进行了温度交叉相关实验，观察到外部温度的影响较小。探头在进行人体呼吸监测时具有超快的响应时间，上升时间和恢复时间分别为 80 ms 和 70 ms。
