Phononic Eco-Sensor for Detection of Heavy Metals Pollutions in Water With Spectrum Analyzer
Ahmed Mehaney, Hamed Gharibi, Ali Bahrami
Abstract
In this research, the numerical analyzing procedure for a two-dimensional (2D) solid-fluid phononic crystal (PnC) demultiplexer is presented. The demultiplexer acts as a selective sensor that could separate three dangerous heavy metals (CuSO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> , MgSO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> and MnSO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> ) with a very low concentration of 1% added in water. The platform consists of a T-model waveguide with three hollow cylinder branches. The PnC demultiplexer is designed with a square arrangement of infinite rods of Stainless steel embedded in the distilled water substrate. To determine the band structure and transmission spectrum, the finite element method has been evaluated. The main waveguides are made by eliminating one row or one column of scatterers. For each branch, the radius of inclusions is changed to have three different defect branches. Hence, the intended demultiplexer can classify three frequencies in the range of kHz. The demultiplexer showed higher performance parameters for all mixtures. Where, the highest transmission intensity is about 95% for MgSO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> -water mixture. The highest sensitivity (66000 Hz.cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> /g) was obtained for theMgSO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> -water mixture while the highest quality factor (10694) and FOM(2437 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> /g)were obtained for the CuSO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> -water mixture. The maximum crosstalk (The worst value) among the three channels equals the value of -25.22 dB. The proposed demultiplexer can act as an eco-sensor for detecting water pollutions with higher performance and selectivity.