An Unpowered Sensor Node for Real-Time Water Quality Assessment (Humic Acid Detection)
AbstractA zero-power microwave sensor is reported for the real-time assessment of water quality. The proposed structure is able to transmit sensed data directly to a base-station without additional data processing at the wireless sensor node (WSN) which results in less power consumption. The base-station propagates a single tone signal at the frequency of f0/2. At the sensing node, an antenna absorbs that signal and a passive frequency doubler makes its frequency twice, i.e., f0, which will be used as the carrier signal. Two pairs of open-ended coaxial probes are used as liquid sensors; one inside a known reference sample and the other one inside the water under test. A combination of both sensors’ data will be sent to the base-station. A special six-port structure is used for modulation of sensed data over the carrier. At the base-station, a receiver will demodulate the received signal for extracting the sensed data. As an example, the system has been evaluated at f0 = 2.45 GHz for the detection of Humic-Acid levels as a common contaminant of river waters. View Full-Text
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Mirzavand, R.; Honari, M.M.; Laribi, B.; Khorshidi, B.; Sadrzadeh, M.; Mousavi, P. An Unpowered Sensor Node for Real-Time Water Quality Assessment (Humic Acid Detection). Electronics 2018, 7, 231.
Mirzavand R, Honari MM, Laribi B, Khorshidi B, Sadrzadeh M, Mousavi P. An Unpowered Sensor Node for Real-Time Water Quality Assessment (Humic Acid Detection). Electronics. 2018; 7(10):231.Chicago/Turabian Style
Mirzavand, Rashid; Honari, Mohammad M.; Laribi, Bahareh; Khorshidi, Behnam; Sadrzadeh, Mohtada; Mousavi, Pedram. 2018. "An Unpowered Sensor Node for Real-Time Water Quality Assessment (Humic Acid Detection)." Electronics 7, no. 10: 231.
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