Ning Xiangping, Yang Jingyi, Zhao Chun Liu, Chan Chi Chiu
Appl Opt. 2016 May 1;55(13):3543-8. doi: 10.1364/AO.55.003543.
The functionality of poly(dimethylsiloxane) (PDMS)-based interferometric fiber sensors for volatile organic compounds (VOCs) detection is investigated and experimentally demonstrated. Two interferometric configurations are considered in this work, namely Fabry-Perot (FP) and Sagnac interferometers (SI). Both sensors are functionalized with a thin layer of VOC-sensitive polymer: PDMS, whose degree of swelling varies as a function of VOC concentrations. This swelling effect will result in an optical path length and birefringence modulation for FP and SI sensors, respectively. In this paper, the two common VOCs, ethanol and 2-propanol, were detected by the proposed sensor and the inverse matrix method was used to differentiate the VOC in gas mixture.
研究并通过实验证明了基于聚二甲基硅氧烷（PDMS）的干涉式光纤传感器用于挥发性有机化合物（VOCs）检测的功能。本工作考虑了两种干涉配置，即法布里 - 珀罗（FP）干涉仪和萨格纳克干涉仪（SI）。两种传感器都用一层对VOC敏感的聚合物：PDMS进行功能化，其溶胀程度随VOC浓度而变化。这种溶胀效应将分别导致FP和SI传感器的光程长度和双折射调制。本文中，所提出的传感器检测了两种常见的VOC，乙醇和2 - 丙醇，并使用逆矩阵法区分混合气体中的VOC。
