Abstract
Flowsensing technology from today’s application perspective has gained significant research interest over the past few years. Among the existing sensing techniques, electrostatic and capacitive sensing techniques have proven promising although cable capacitance and stray capacitance cause inaccuracy while measuring very small capacitances. The existing measurement circuit model is complicated and has flawed electrode arrangement. By sensing very small capacitive variation, the developed capacitive technique has proven capable of reducing the stray and residual capacitance effect by using an interface sensing circuit based on circular and semicircular shaped electrode and modified capacitive bridge. The proposed interface circuit is simulated via PSPICE for realizing the small capacitive variation with permittivity variation. Hardware implementation is carried out using a flow sensing set up that senses two kinds of biomass flow variation as a change of dielectric permittivity under room conditions. The output voltage has been reproduced as a representative of the flow. Moreover, a comprehensive investigation into experimental data shows an agreeable level of consistency with the simulation results.KEYWORDS: electrodes; sensing; capacitance; electrostatic; piping; measurement
Highlights
Suitable instrumentations for on-line monitoring and measurement in gas-solid twophase flow has proven to be an exigent task for scientists and researchers at universities and institutes
This paper aims to analyze on biomass flow sensing behaviour by making use of a cost effective and simple measurement interface circuit along with two designed semi-circular and circular shaped capacitive electrodes
The experimental and simulation results obtained for a particular flow regime in the case of distinctive biomass materials has been observed, where the output voltage has become the representative of flow, as a measure of small capacitance change which proves the mathematical derivation
Summary
Suitable instrumentations for on-line monitoring and measurement in gas-solid twophase flow has proven to be an exigent task for scientists and researchers at universities and institutes. A promising capacitive sensing technique [7] based on stainless steel source grid sensing electrodes to increase high and homogeneous capacitance sensitivity over the pipe cross section was developed by some researchers for measuring pulverized fuel concentration in a laboratory scale pneumatic conveying system along with the calibration facility. Biomass transportation by air is unpredictable owing to the particles’ complicated physical characteristics It results in insufficient industrial biomass process; so the prospective of biomass as renewable energy source is still unrealized. This paper aims to analyze on biomass flow sensing behaviour by making use of a cost effective and simple measurement interface circuit (that reduces stray and residual capacitance) along with two designed semi-circular and circular shaped capacitive electrodes
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