Abstract
Conductivity is a crucial parameter in water quality detection, which can roughly represent overall concentration of various inorganic ions. However, traditional conductivity sensors can only afford high performance measurement in a relatively low range while the concentration may vary much more in realworld water environment. This paper proposes a high-precision and wide-range measurement method based on a novel planar interdigital electrode sensor array and a self-adaptive algorithm. The array is composed of 3 pairs of planar electrodes with various cell constants aiming at different subdivided conductivity sections. The follow-up circuit and the self-adaptive algorithm keep the optimal electrode pair dominates the output of the array. Numerical simulations were utilized to optimize sensor parameters before fabrication. PCB manufacturing technique was used which guaranteed a relatively low manufacturing cost and stable performance. Experiments were conducted to verify the sensing performance and results showed that the array can maintain precise measurement from 0.5μs/cm to 500ms/cm.
Highlights
Conductivity is one of the most important parameters in water quality monitoring and aquatic environment protection
If conductivity measured in a lake is much higher than the standard, it may suffer from water pollution like eutrophication
A quick and accurate conductivity measurement is of much help in water quality monitoring that makes some water pollution detectable at its early stage, while conductivity sensor is key device for it
Summary
Conductivity is one of the most important parameters in water quality monitoring and aquatic environment protection. X. Wang et al.: Self-Adaptive and Wide-Range Conductivity Measurement Method developed conductivity sensor as a network node for real time monitoring of water in different fields. Various types of conductivity sensor has been developed, the performance for water quality monitoring in real environment is still challenging [14]–[18]. It is difficult for one sensor to maintain a reasonable sensitivity in such a wide range It is the nature of conductivity measurement that the sensitivity will decrease as the conductivity increases for a pair of measuring electrode no matter what type of the electrode is designed. The paper proposes a novel planar sensor array with several pairs of interdigital electrodes for conductivity measurement, and a corresponding algorithm is derived to insure the sensitivity and stability in a wide conductivity ranges.
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