采用液滴分析技术定量检测水中溶解氧的研究

Quantitative detection of dissolved oxygen in the water by droplet analysis technology

在原有光纤-电容传感器的基础上,引入了光纤溶解氧(DO)传感器,在保持液滴分析仪原有结构的情况下,可同时获得水质的定性和定量信息。基于液滴分析技术(DAT)对水中30种不同浓度的DO含量进行了检测。实验结果表明,基于DTA,采用光纤DO传感器检测液体的DO含量是有效的。在考虑温度影响时,二次多项式拟合模型效果最佳,系统的灵敏度可达0.1mg/L,最大相对误差为2.38%。

Based on the original optical fiber-capacitance sensor,we introduce the dissolved oxygen（DO） optical fiber sensor,which can obtain the qualitative and quantitative information of water quality simultaneously with the structure of the droplet analyzer.Based on liquid drops analysis technique（DAT）,30 different concentrations of DO have been tested.Experimental results show that it is feasible to test dissolved oxygen concentration with the proposed sensor using DAT.Considering the temperature affection,the quadratic polynomial model gives the best fitting result.The system′s sensitivity is 0.1 mg/L,and the maximal relative error is 2.38%.