A portable and low-cost parallel-plate capacitor sensor for alkali and heavy metal ions detection  

作　　者：Septia Kholimatussadiah Tri Anggono Prijo 

机构地区：[1]Department of Physics,Faculty of Science and Technology Universitas Airlangga,Surabaya,Indonesia

出　　处：《Journal of Advanced Dielectrics》2018年第4期28-34,共7页先进电介质学报（英文）

摘　　要：A portable and low-cost design of parallel-plate capacitor sensor is proposed and investigated for detection of heavy and alkali metal ions concentration in liquid solution.The application of a thin and long-sided parallel PCB plate allows one to measure the dielectric response of each sample through capacitive sensing technique.The measurements were based on the peak output voltage corresponding to the capacitance of the output measured by an oscilloscope with metal ions concentration of the solution varying from 0 to 10 ppm and input frequency ranging from 1 kHz to 10 MHz.The ICF of Li,Na and K in chloride solution was 2.4,2.1 and 1.9 MHz,respectively.The ICF of Na and K in hydroxide solution was 1.5 MHz and 1.1 MHz,respectively,while the ICF of Pb(NO_(3))_(2)was 490 kHz.The detected ICF was applied to further construct the portable sensor system,which is simple in design,low-cost in fabrication and easy to operate.The finding of ICF of each chemical element is necessary to solve the selectivity challenge of the capacitance-based sensor,which will be appropriate for chemical,environmental and engineering applications.

关 键 词：Capacitive sensing capacitor sensor characteristic frequency metal ions detection parallel-plate capacitor. 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]