Li Fengmei, Wei Yaoguang, Chen Yingyi, Li Daoliang, Zhang Xu
College of Information and Electrical Engineering, China Agricultural University, 17 Tsinghua East Road, Beijing 100083, China.
Sensors (Basel). 2015 Dec 9;15(12):30913-26. doi: 10.3390/s151229837.
Dissolved oxygen (DO) is a key factor that influences the healthy growth of fishes in aquaculture. The DO content changes with the aquatic environment and should therefore be monitored online. However, traditional measurement methods, such as iodometry and other chemical analysis methods, are not suitable for online monitoring. The Clark method is not stable enough for extended periods of monitoring. To solve these problems, this paper proposes an intelligent DO measurement method based on the fluorescence quenching mechanism. The measurement system is composed of fluorescent quenching detection, signal conditioning, intelligent processing, and power supply modules. The optical probe adopts the fluorescent quenching mechanism to detect the DO content and solves the problem, whereas traditional chemical methods are easily influenced by the environment. The optical probe contains a thermistor and dual excitation sources to isolate visible parasitic light and execute a compensation strategy. The intelligent processing module adopts the IEEE 1451.2 standard and realizes intelligent compensation. Experimental results show that the optical measurement method is stable, accurate, and suitable for online DO monitoring in aquaculture applications.
溶解氧（DO）是影响水产养殖中鱼类健康生长的关键因素。溶解氧含量会随水环境变化，因此需要进行在线监测。然而，传统测量方法，如碘量法和其他化学分析方法，并不适合在线监测。克拉克方法在长时间监测时不够稳定。为解决这些问题，本文提出一种基于荧光猝灭机制的智能溶解氧测量方法。测量系统由荧光猝灭检测、信号调理、智能处理和电源模块组成。光学探头采用荧光猝灭机制检测溶解氧含量，解决了传统化学方法易受环境影响的问题。光学探头包含一个热敏电阻和双激发源，用于隔离可见寄生光并执行补偿策略。智能处理模块采用IEEE 1451.2标准，实现智能补偿。实验结果表明，该光学测量方法稳定、准确，适用于水产养殖应用中的溶解氧在线监测。
