Design And Development Of Fluid Density Determination Based On Piezoelectric Coupling Sensors

Ser, Wendy Ze Xian (2017) Design And Development Of Fluid Density Determination Based On Piezoelectric Coupling Sensors. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In every industry,waste-water treatment is used to remove pollutants and contaminant to reduce the impact toward the environment.Various types of sensors are used to adjust the operating system of waste-water treatment plant by measuring water flow,water pressure,water level and water quality.However,manual monitoring still involves laboratory testing for controlling water quality in the waste-water treatment process,which is not portable and involving bulky machine.Hence,a new method should be implemented to minimize the manual monitoring in waste-water treatment which can detect the density of fluid that influenced by the contaminant.For this project,the piezoelectric coupling device is being used as an actuator and a sensor to determine the changes of the density of fluid due to the contaminant.The tested sample is in the liquid state and it needs to be contained in a designated chamber for it to be measurable.The chamber is being designed in such a way that the fluid can flow in and out for the experiment. The signal that produced from the piezoelectric sensor will be amplified and filtered before it is being analyzed.It was found that the operating frequency to detect varying density is between 1 kHz to 2 kHz.In the experiment set-up,the piezoelectric coupling device is placed in parallel and the chamber is located between the piezoelectric actuator and sensor.The piezoelectric actuator converts the electrical energy to produce an acoustic wave which propagates through the liquid in the chamber.The piezoelectric sensor picks up the acoustic wave and converts the signal into electrical signal.The density of the fluid affects the speed of propagation of the acoustic wave,therefore,the resonance frequency is inverse proportional to the density.From the experimental result, tap water with density 1.016 (g/ml) has a resonance of 1460 Hz compared to higher density fluid of sugar water with the density of 1.024 (g/ml) has a resonance of 1440 Hz.

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