Md. Eshrat E. Alahi

A Temperature Compensated Smart Nitrate-Sensor for Agricultural Industry

Extended research on the design and development of a smart nitrate sensor for monitoring nitrate concentration in surface and groundwater are reported in this paper. The developed portable sensing system consists of a planar interdigital sensor, associated electronics, instrumentation, and electrochemical impedance spectroscopy based analysis. The system is capable of measuring nitrate concentrations in the range of 0.01–0.5 mg/L in ground and surface water. This paper extends our earlier work by including a temperature compensation capacity within the sensor. WiFi-based Internet of Things (IoT) has been included, making it a connected sensing system. The system is capable of sending data directly to an IoT-based web server, which will be useful to develop distributed monitoring systems in the future. The developed system has the potential to monitor the impact of industrial, agricultural, or urban activity on water quality, in real time.

Practical nitrate sensor based on electrochemical impedance measurement

This paper showcases the design and development of a portable sensing system that could be used in-situ to detect the concentrations of nitrate salts present in the groundwater. Electrochemical Impedance Spectroscopy was employed to identify and display nitrate concentrations by using planar interdigital sensor immersed in the stream water samples. Calibration samples were prepared by serial dilution of the nitrate stock solution in the laboratory and test samples were collected from different surface water sources. The test samples were evaluated by the commercial equipment and designed system. Although a difference was observed between these two results, the designed system showed a good linear relationship between the measured nitrate concentrations (range from 0.1 to 0.5 mg/L) of the water solution in the real part of the impedance. The promising comparative results announced the extraordinary potential of the developed system for its in-situ nitrate contamination detection with real-time monitoring.

Erratum: Sandeep P., et al. A Novel Secure IoT-Based Smart Home Automation System Using a Wireless Sensor Network. Sensors 2017, 17, 69

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A Simple Embedded Sensor: Excitation and Interfacing

Some of the basic sensors and their operating principle have been explained in this chapter. There is the certain advantage of capacitive/inductive sensors over resistive sensors. The operating principle of capacitive sensors and type of measurement techniques are also explained. Finally, design and development of a low-cost portable sensing system were explained which can measure the impedance of a capacitive sensor and might be useful for different applications. There are some various applications explained by using capacitive sensors.