Open AccessOn–Chip Droplets Sensing using Capacitive Technique
Author(s) -
Mohd Harun Abdullah,
Pei Ling Leow,
Mohd Azhar Abdul Razak,
Fauzan Khairi Che Harun
Publication year - 2013
Publication title -
jurnal teknologi/jurnal teknologi
Language(s) - English
Resource type - Journals
eISSN - 2180-3722
pISSN - 0127-9696
DOI - 10.11113/jt.v61.1641
Subject(s) - microchannel , microfluidics , capacitive sensing , capacitance , materials science , microfluidic chip , electrode , microscope , chip , nanotechnology , optoelectronics , microelectrode , lab on a chip , interface (matter) , sensitivity (control systems) , computer science , optics , electronic engineering , chemistry , engineering , telecommunications , physics , capillary number , capillary action , composite material , operating system
Significant attention has been given on the development of droplets–based microfluidic system because of its potential and apparent advantages. Beside the advantages of reducing the sample volume, it’s also offer less time consuming for the analysis. Optical and fluorescence among the famous method that was used in detection of droplets but they are normally bulky, expensive and not easily accessed. This paper proposed a simple, low cost and high sensitivity for droplets sensing in microfluidic devices by using capacitive sensor. Coplanar electrodes are used to form a capacitance through the microfluidic channel. The design of eight pair of electrodes was used to detect the presence of a droplet. Changes in capacitance due to the presence of a droplet in the sensing area is detected and used to trigger the microscope to capture the image of detected droplets in microchannel. The measurement of droplets detected and counting are displayed through a LABVIEW interface in the real time.