Abstract
We have been developing a wireless sensor network system to monitor the quality of lake water in real time. It consists of a sensor module and a system module, which includes communication and power modules. We have focused on pH, turbidity and chlorophyll a concentration as the criteria for qualifying lake water quality. These parameters will be detected by a microfluidic device based sensor module embedded in the wireless sensor network system. In order to detect the turbidity and the chlorophyll a concentration simultaneously, we propose a simple optical measurement method using LED and photodiode in this paper. Before integrating a turbidity and chlorophyll a concentration sensor into the microfluidic device based pH sensor, we performed feasibility studies such as confirmation of the working principle and experiments using environmental water samples. As a result, we successfully verified our simultaneous sensing method by using a simple optical setup of the turbidity and the chlorophyll a concentration.
Highlights
In terms of natural resource preservation, a real-time and constant environmental monitoring system is an important research and development topic [1,2,3,4,5,6]
Sufficient numbers of water quality monitoring systems cannot be established in large natural resources such as lakes or rivers due to their high cost
Before integrating the turbidity and chlorophyll a concentration sensors into the microfluidic sensor module with a pH sensor, we studied the feasibility of simultaneous sensing through a simple optical measurement setup
Summary
In terms of natural resource preservation, a real-time and constant environmental monitoring system is an important research and development topic [1,2,3,4,5,6]. Sufficient numbers of water quality monitoring systems cannot be established in large natural resources such as lakes or rivers due to their high cost. It causes low accuracy of water quality monitoring. In the case of the sensor module, various sensors to monitor water quality, such as pH sensors, turbidity sensors, chlorophyll a concentration sensors, and temperature sensors, will be integrated into a microfluidic device Among those sensors, we have developed a pH sensor. Before integrating the turbidity and chlorophyll a concentration sensors into the microfluidic sensor module with a pH sensor, we studied the feasibility of simultaneous sensing through a simple optical measurement setup. We propose a simple optical measurement method for the simultaneous sensing of turbidity and chlorophyll a concentration, and report the results of a feasibility study
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