Design of An intelligent pH sensor based on IEEE1451.2

Abstract

Along with the repaid growth of aquaculture production and high density in China, the Water quality real-time monitoring has become more and more important that influence the development of aquaculture. The pH is an important parameter for measuring the water quality, and the pH affects the growth and reproduction of aquatic animals. However, the traditional pH measurement methods have several disadvantages, such as low stability, heavy drift, short service life, poor anti-interference ability, long response time and low accuracy. To solve these problems, this paper proposed an intelligent pH sensor based on IEEE1451.2 mechanism. The intelligent pH sensor includes light detection module, signal processing module and intelligent calibration module. The light detection module adopts fluorescent absorption methods to obtain the pH signal. The optical fibre is been selected as the transmission element. The signal processing module is responsible for processing pH signals, which convert the output of pH probe from mV to V. It adopts the IEEE 1451.2 standard to achieve the intelligent compensation of turbidity, light source, temperature and ionic strength. The experiments results have shown that the intelligent pH sensor is stable, accurate and suitable for online monitoring in aquaculture.