基于氧敏感膜的海水溶解氧测定技术研究

提出了一种利用荧光猝灭原理测定海水溶解氧的方法，分别从光电检测电路、LED驱动电路、光电二极管电路、温度检测电路、信号产生采集处理控制电路等方面详细介绍了基于氧敏感膜的海水荧光信号检测系统设计方案，通过实验测试了荧光信号检测系统对荧光相位滞后检测能力、系统的整体稳定性和系统测试数据的准确度。准确度测试中溶解氧测试数据点饱和度从100.00%减小到11.56%，氧敏感膜荧光信号检测系统所测数据与碘量法误差最大为5.15 μmol/L，两种方法变化趋势相同。此系统可以作为一种海水溶解氧测量仪器，具有良好的应用价值。

A dissolved oxygen detection technique based on an oxygen sensitive membrane in seawater

A fluorescence quenching method for detecting dissolved oxygen in seawater was proposed. A design scheme of fluorescence detection system based on an oxygen sensitive membrane in seawater was introduced in detail from the aspects of photoelectric detection circuit, LED drive circuit, photodiode circuit, temperature detection circuit, signal generation acquisition, and control circuit, etc. The fluorescence detection system was tested for measurement accuracy in phase lag detection, systematic stability, and system test data. In the data accuracy test, the dissolved oxygen saturation was found to have reduced from 100.00% to 11.56%. The error between the measurements obtained by the fluorescence detection system based on an oxygen sensitive membrane and iodimetry was 5.15 μmol/L, and the two methods showed the same trend. This system could be used as a seawater-dissolved oxygen-measuring instrument with good application value.