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Galvanic Cell Type Sensor for Soil Moisture Analysis
journal contribution
posted on 2015-07-21, 00:00 authored by Pramod Gaikwad, Mruthyunjayachari
Chattanahalli Devendrachari, Ravikumar Thimmappa, Bhuneshwar Paswan, Alagar Raja Kottaichamy, Harish Makri Nimbegondi
Kotresh, Musthafa Ottakam ThotiylHere we report the first potentiometric
sensor for soil moisture
analysis by bringing in the concept of Galvanic cells wherein the
redox energies of Al and conducting polyaniline are exploited to design
a battery type sensor. The sensor consists of only simple architectural
components, and as such they are inexpensive and lightweight, making
it suitable for on-site analysis. The sensing mechanism is proved
to be identical to a battery type discharge reaction wherein polyaniline
redox energy changes from the conducting to the nonconducting state
with a resulting voltage shift in the presence of soil moisture. Unlike
the state of the art soil moisture sensors, a signal derived from
the proposed moisture sensor is probe size independent, as it is potentiometric
in nature and, hence, can be fabricated in any shape or size and can
provide a consistent output signal under the strong aberration conditions
often encountered in soil moisture analysis. The sensor is regenerable
by treating with 1 M HCl and can be used for multiple analysis with
little read out hysteresis. Further, a portable sensor is fabricated
which can provide warning signals to the end user when the moisture
levels in the soil go below critically low levels, thereby functioning
as a smart device. As the sensor is inexpensive, portable, and potentiometric,
it opens up avenues for developing effective and energy efficient
irrigation strategies, understanding the heat and water transfer at
the atmosphere–land interface, understanding soil mechanics,
forecasting the risk of natural calamities, and so on.
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Keywords
understanding soil mechanicspotentiometric sensor1 M HClwater transferirrigation strategiesnonconducting stateredox energiesbattery type discharge reactionsoil moisture analysisGalvanic Cell Type Sensorwarning signalsart soil moisture sensorspolyaniline redox energy changesend usermoisture sensoroutput signalSoil Moisture AnalysisHeremoisture levelsbattery type sensoraberration conditionsGalvanic cellsvoltage shiftsoil moistureprobe size
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