Development of a PCB-based passive capacitive sensor for fluidic flow detection

Authors

  • Nhu Cuong Nguyen
  • Bao Anh Hoang
  • Trung Kien Do
  • Thanh Tung Bui
  • Duc Trinh Chu
  • Quang Loc Do*

Keywords:

fluidic flow detection, passive capacitive detection, printed circuit board

Abstract

A passive wireless sensor system integrated with capacitive fluidic flow detection is proposed and developed based on the printed circuit board (PCB) technique. The capacitive sensing structure consists of PCB-based electrodes enclosing an insulating pipe that contains the fluidic flow of interest. The conductivity of the fluidic flow and the appearance of foreign objects within the flow can be determined by analysing the resonant frequency of the detection path in the proposed system. Experimental results demonstrate that the resonant frequency increases according to the increase in electrical conductivity of the fluidic flow. In addition, the sensing performance is also confirmed by the detection of sizes and electrical conductivities of NaCl droplets passing through the detection zone. Furthermore, this work indirectly verifies the effectiveness and feasibility of the integration of passive wireless sensing technique into the fluidic flow detector by using the PCB fabrication technique and demonstrates great potential for use in various applications in biomedical and chemical fields, especially in biomedical applications.

DOI:

https://doi.org/10.31276/VJSTE.65(3).08-13

Classification number

2.1, 2.3

Author Biographies

Nhu Cuong Nguyen

Faculty of Electronics and Telecommunications, VNU University of Engineering and Technology, 144 Xuan Thuy Street, Dich Vong Hau Ward, Cau Giay District, Hanoi, Vietnam

Bao Anh Hoang

Faculty of Electronics and Telecommunications, VNU University of Engineering and Technology, 144 Xuan Thuy Street, Dich Vong Hau Ward, Cau Giay District, Hanoi, Vietnam

Trung Kien Do

Faculty of Physics, VNU University of Science, 334 Nguyen Trai Street, Thanh Xuan Trung Ward, Thanh Xuan District, Hanoi, Vietnam

Thanh Tung Bui

Faculty of Electronics and Telecommunications, VNU University of Engineering and Technology, 144 Xuan Thuy Street, Dich Vong Hau Ward, Cau Giay District, Hanoi, Vietnam

Duc Trinh Chu

Faculty of Electronics and Telecommunications, VNU University of Engineering and Technology, 144 Xuan Thuy Street, Dich Vong Hau Ward, Cau Giay District, Hanoi, Vietnam

Quang Loc Do

Faculty of Physics, VNU University of Science, 334 Nguyen Trai Street, Thanh Xuan Trung Ward, Thanh Xuan District, Hanoi, Vietnam

Downloads

Published

2023-09-15

Received 24 August 2022; revised 26 September 2022; accepted 3 October 2022

How to Cite

Nhu Cuong Nguyen, Bao Anh Hoang, Trung Kien Do, Thanh Tung Bui, Duc Trinh Chu, & Quang Loc Do. (2023). Development of a PCB-based passive capacitive sensor for fluidic flow detection. Vietnam Journal of Science, Technology and Engineering, 65(3), 8-13. https://doi.org/10.31276/VJSTE.65(3).08-13

Issue

Section

Physical Sciences