在线溶氧仪集成设计及数据处理算法研究

发布时间：2018-04-23 12:11

本文选题：荧光猝灭法 + 溶解氧　；参考：《东南大学》2015年硕士论文

【摘要】：现今,随着我国对水污染治理问题的日益关注,检测水质成为其中的一项关键技术。溶解氧是衡量水质的一个重要指标,在水污染治理、鱼类养殖业等领域起着十分重要的作用,国内外主要的溶解氧检测方法有三种：碘量法、Clark氧电极法和荧光猝灭法。本文的研究基于荧光猝灭效应,其目的是设计一个工作性能稳定且准确度较好的溶氧仪测试样机,主要是完成硬件电路设计和软件数据处理算法两个方面的工作。测试样机由主机和探头两个部分组成：探头实现信号的采集和处理以解算得到水中的溶解氧值和温度值;主机实现人机交互功能,实时显示溶解氧值。系统硬件电路集成方面的工作主要是实现主机与探头之间的协同工作以及系统的便携性要求：主机与探头之间的通信,独立直流电源的设计,机械外壳的设计以及程序的固化。同时,为了能够更简便的测量出水中的溶解氧,文中对锁相环电路检测荧光寿命进行了探讨。软件算法处理的目的是提高测试样机的准确度以及稳定性：通过实验分析得到荧光寿命值、荧光猝灭系数与水中温度的函数关系,进行温度补偿；与标准仪器进行对比实验以调整测试样机完成标定工作。文中实现测试样机的温度补偿和标定工作后,对测量数据进行了最后的数字滤波处理,滤掉随机脉冲干扰以及改善测量数据的平滑度。最终,测试样机的测量精度为0.1mg/L。
[Abstract]:Nowadays, with the increasing concern of water pollution control in China, water quality detection has become one of the key technologies. Dissolved oxygen (do) is an important index to measure water quality. It plays an important role in water pollution control, fish culture and other fields. There are three main dissolved oxygen detection methods at home and abroad: iodine method, Clark oxygen electrode method and fluorescence quenching method. Based on the fluorescence quenching effect, the purpose of this paper is to design a test prototype of oxygen dissolving instrument with stable performance and good accuracy, mainly to complete the hardware circuit design and the software data processing algorithm. The test prototype is composed of two parts: the signal is collected and processed by the probe to calculate the dissolved oxygen value and the temperature value in the water, and the man-machine interaction function is realized by the host computer, and the dissolved oxygen value is displayed in real time. The main work of the system hardware circuit integration is to realize the cooperative work between the host and the probe and the portable requirement of the system: the communication between the host and the probe, the design of the independent DC power supply, the design of the mechanical shell and the solidification of the program. At the same time, in order to measure dissolved oxygen in water more easily, the fluorescence lifetime of PLL circuit is discussed in this paper. The purpose of the software algorithm processing is to improve the accuracy and stability of the test prototype. Through the experimental analysis, the value of fluorescence lifetime, the function relationship between fluorescence quenching coefficient and temperature in water are obtained, and the temperature compensation is carried out. Compare with the standard instrument to adjust the test prototype to complete the calibration work. After the temperature compensation and calibration of the test prototype are realized, the final digital filtering is carried out to filter the random pulse interference and improve the smoothness of the measured data. Finally, the precision of the test prototype is 0.1 mg / L.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X853

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