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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
지창현scopus
Issue Date
2012
Journal Title
Journal of Micromechanics and Microengineering
ISSN
0960-1317JCR Link
Citation
vol. 22, no. 9
Indexed
SCI; SCIE; SCOPUS WOS scopus
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
Appears in Collections:
엘텍공과대학 > 전자공학과 > Journal papers
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