Optical Fiber Sensor for Determination of Methanol Ratio in Methanol-Doped Ethanol Based on Two Cholesteric Liquid Crystal Droplets Embedded in Chitosan
Optical Fiber Sensor for Determination of Methanol Ratio in Methanol-Doped Ethanol Based on Two Cholesteric Liquid Crystal Droplets Embedded in Chitosan
复制标题
基于壳聚糖中嵌入的两个胆甾型液晶液滴的光纤传感器用于测定掺甲醇的乙醇中的甲醇比率
DOI：
10.1109/jlt.2021.3078744
复制
发表时间：
2021-08-01
影响因子：
4.7
通讯作者：
Liu, Yongjun
中科院分区：
文献类型：
--
作者：
Su, Yueming;Lan, Zeqing;Liu, Yongjun
本文设计了一种基于双折射液晶（CLC）的光纤传感器，用于检测酒精溶液中甲醇和乙醇的比例和浓度。由于甲醇和乙醇分子的极性不同，CLC的沥青会发生不同程度的溶胀。因此，当将传感器置于两种不同比例和浓度的醇类混合溶液中时，CLC的反射光波长会发生不同的偏移。壳聚糖聚合物网络的功能是固定和保护CLC液滴，它也允许小分子通过并与CLC相互作用。两种CLC对甲醇的灵敏度分别为0.296 nm/v%和0.467 nm/v%，对乙醇的灵敏度分别为0.764 nm/v%和1.133 nm/v%。该传感器对酒精溶液的检测范围为0.5v/v%~ 30 v/v%。采用最小二乘法得到了波长漂移与比例和总浓度的线性关系，并对传感器的相关特性进行了探索。
In this paper, an optical fiber sensor based on cholesteric liquid crystal (CLC) is designed to detect the proportion and concentration of methanol and ethanol in alcohol solution. Due to the different polarity of methanol and ethanol molecules, the pitch of CLC will swell in different degrees. Therefore, the reflected light wavelength of CLCs will shift differently when the sensor is put into the mixed solution of two alcohols with different proportions and concentrations. The function of chitosan polymer network is to fix and protect CLC droplets, it also allows small molecules to pass through and interact with CLC. The sensitivities of the two CLCs are 0.296 nm/v% and 0.467 nm/v% to methanol, and 0.764 nm/v% and 1.133 nm/v% to ethanol, respectively. The detection range of the sensor for alcohol solution is 0.5v/v% –30v/v%. The linear relationship between wavelength shift and proportion and total concentration was obtained by least square method, and the related characteristics of the sensor were explored.