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High-Performance Ultrafast Humidity Sensor Based on Microknot Resonator-Assisted Mach–Zehnder for Monitoring Human Breath
ACS Sensors ( IF 8.9 ) Pub Date : 2020-10-14 , DOI: 10.1021/acssensors.0c00863
Yating Yi 1 , Yuxuan Jiang 1 , Haiyan Zhao 1 , Gilberto Brambilla 2 , Yaxian Fan 3 , Pengfei Wang 1, 4
Affiliation  

Monitoring the dynamic humidity requires sensors with fast response and anti-electromagnetic interference, especially for human respiration. Here, an ultrafast fiber-optic breath sensor based on the humidity-sensitive characteristics of gelatin film is proposed and experimentally demonstrated. The sensor consists of a microknot resonator superimposed on a Mach–Zehnder (MZ) interferometer produced by a tapered single-mode fiber, which has an ultrafast response (84 ms) and recovery time (29 ms) and a large dynamic transmission range. The humidity in dynamic ambient causes changes in the refractive index of gelatin coating, which could trigger spectral intensity transients that can be explicitly distinguished between the two states. The sensing principle is analyzed using the traditional transfer-matrix analysis method. The influence of coating thickness on the sensor’s trigger threshold is further investigated. Experiments on monitoring breath patterns indicate that the proposed breath sensor has high repeatability, reliability, and validity, which enable many other potential applications such as food processing, health monitoring, and other biomedical applications.

中文翻译:

基于微结谐振器辅助的Mach–Zehnder的高性能超快湿度传感器,用于监测人的呼吸

监视动态湿度需要具有快速响应和抗电磁干扰的传感器,尤其是对于人类呼吸。在此,提出了一种基于明胶膜对湿度敏感特性的超快光纤呼吸传感器,并进行了实验证明。该传感器由一个微结谐振器组成,该谐振器叠加在由锥形单模光纤制成的Mach-Zehnder(MZ)干涉仪上,具有超快的响应时间(84 ms)和恢复时间(29 ms),并且动态传输范围大。动态环境中的湿度会导致明胶涂层的折射率发生变化,这可能会触发光谱强度瞬变,可以在两种状态之间明确区分。使用传统的传递矩阵分析方法来分析感测原理。进一步研究了涂层厚度对传感器触发阈值的影响。监测呼吸模式的实验表明,所提出的呼吸传感器具有很高的可重复性,可靠性和有效性,可实现许多其他潜在的应用,例如食品加工,健康监测和其他生物医学应用。
更新日期:2020-11-25
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