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공과대학
전자전기공학전공
Journal papers
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A particle counting system using the photodetector array of a CMOS image sensor
Title
A particle counting system using the photodetector array of a CMOS image sensor
Authors
Lee S.-J.
;
Seo Y.-T.
;
Koh Y.
;
Ji C.-H.
;
Kim Y.-K.
Ewha Authors
지창현
SCOPUS Author ID
지창현
Issue Date
2012
Journal Title
Journal of Micromechanics and Microengineering
ISSN
0960-1317
Citation
Journal of Micromechanics and Microengineering vol. 22, no. 9
Indexed
SCI; SCIE; SCOPUS
Document Type
Article
Abstract
In this paper, a particle counting system using a CMOS image sensor is demonstrated. The system utilizes a linear photodetector array as a detection element. Therefore, the particles are detected by multiple detectors simultaneously, in contrast to a single detector in conventional particle counting devices, while maintaining the sensitivity. Another advantage of the proposed system is that particles are detected across the full-channel width which removes the need for a particle-focusing method. Also, the proposed system can easily be integrated with a microfluidic chip fabricated on a transparent substrate, as the counting system is attached under the microchannel and counts the particles optically. Detection of polystyrene microbeads has been tested at a flow rate of 5.15mm s -1. For 21 measurements, the proposed system showed an average count error of 4.56% and a standard deviation of 3.06% using a proposed compensation algorithm. Potentially, the proposed system can detect even smaller particles simply by utilizing a higher resolution CMOS image sensor. © 2012 IOP Publishing Ltd.
DOI
10.1088/0960-1317/22/9/095015
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