Wavelet transform for Shah convolution velocity measurements of single particles and solutes in a microfluidic chip

Jan C.T. Eijkel, Yien C. Kwok, Andreas Manz*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)

Abstract

Wavelet transform analysis is applied to determine the speed of fluorescent polystyrene microspheres and fluorescent solutes in a microchip. The data analysed consist of the periodical signal (Shah convolution) obtained when fluorescent particles or solute plugs move in a channel that is covered with a chromium grid pattern. This setup converts velocity into a (fluorescence emission) frequency, and previous analyses therefore used Fourier transform to extract the frequency information. In this paper it is shown that wavelet transform has some advantages over Fourier transform. With wavelet transform, time information can be obtained in addition to frequency information. Thus the speed of individual particles was determined together with their moments of appearance and disappearance in the system. With solutes small changes of velocity during the analysis were detected, and an improvement in peak frequency resolution was obtained.

Original languageEnglish
Pages (from-to)122-126
Number of pages5
JournalLab on a chip
Volume1
Issue number2
DOIs
Publication statusPublished - 1 Dec 2001
Externally publishedYes

Fingerprint Dive into the research topics of 'Wavelet transform for Shah convolution velocity measurements of single particles and solutes in a microfluidic chip'. Together they form a unique fingerprint.

Cite this