Towards a fast and stable tachypnea monitor:a C_(60)-Lys enabled optical fiber sensor for humidity tracking in breath progress  

作　　者：王富祥 高峰 王小牛 王莹 金飞 任紫峭 武俊 黄振林 周文俊 沈常宇 Fuxiang Wang;Feng Gao;Xiaoniu Wang;Ying Wang;Fei Jin;Ziqiao Ren;Jun Wu;Zhenlin Huang;Wenjun Zhou;Changyu Shen(College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China;College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China [2]College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,China

出　　处：《Chinese Optics Letters》2024年第2期101-108,共8页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.12274386 and 52002365);Zhejiang Provincial Natural Science Foundation of China(Nos.LQ23F050006,LY21F050006,and LQ21E020005);Key R&D Project of Zhejiang Province(No.2021C01179);National Key R&D Program of China(No.2021YFF0600203)。

摘　　要：The pandemic of respiratory diseases enlightened people that monitoring respiration has promising prospects in averting many fatalities by tracking the development of diseases.However,the response speed of current optical fiber sensors is still insufficient to meet the requirements of high-frequency respiratory detection during respiratory failure.Here,a scheme for a fast and stable tachypnea monitor is proposed utilizing a water-soluble C_(60)-Lys ion compound as functional material for the tracking of humidity change in the progression of breath.The polarization of C_(60)-Lys can be tuned by the ambient relative humidity change,and an apparent refractive index alteration can be detected due to the small size effect.In our experiments,C_(60)-Lys is conformally and uniformly deposited on the surface of a tilted fiber Bragg grating(TFBG)to fabricate an ultra-fast-response,high-sensitivity,and long-term stable optical fiber humidity sensor.A relative humidity(RH)detecting sensitivity of 0.080 dB/%RH and the equilibrium response time and recovery time of 1.85 s and 1.58 s are observed,respectively.Also,a linear relation is detected between the resonance intensity of the TFBG and the environment RH.In a practical breath monitoring experiment,the instantaneous response time and recovery time are measured as 40 ms and 41 ms,respectively,during a 1.5 Hz fast breath process.Furthermore,an excellent time stability and high repeatability are exhibited in experiments conducted over a range of 7 days.

关 键 词：humidity sensor fullerene derivative optical fiber sensing tilted fiber Bragg grating NANOMATERIALS 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] R318.6[自动化与计算机技术—控制科学与工程]