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Vol. 141, No. 6, June 2012, pp. 127-133

 

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Low Concentration Sodium Chloride Salinity Detection System

 

* Hee C. LIM, Hio Giap OOI, Yew Fong HOR

Tunku Abdul Rahman College University, Microelectronics and Physics Department, Block D300, Jalan Genting Kelang, 53300, Setapak, Kuala Lumpur, Malaysia

* E-mail: limhc@mail.tarc.edu.my

 

Received: 28 May 2012   /Accepted: 25 June 2012   /Published: 30 June 2012

 

Digital Sensors and Sensor Sysstems

 

Abstract: An AC Andersons bridge coupled with a low matching impedance solenoid coil is employed to detect and measure low concentration of sodium chloride aqueous solutions (ppm) is designed and constructed. The sensory system is independent of the excited driving frequency. The finite element method simulation of the sensor element is simulated and modeled with approximately 1.23 million 3D tetrahedron meshes with CST EM studio. The constructed induction sensor is sensitive and able to observe Millipore Milli-Q low resistivity (18.2 MOhm·cm) ultrapure water and various concentration of lab prepared sodium chloride solutions. The observed sodium chloride system sensitivity is -1.5228 ´ 10-4 ln{NaCl (ppm)} with high correlation constant of R = 0.9835.

 

Keywords: Aqueous NaCl, Induction sensor, Andersons’ bridge, Non-invasive, ppm

 

 

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