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Analytzcu Chumca A&z, 267 (1992) 73-80 Elsemer Science Pubbshers B V , Amsterdam

Summary: Analytzcu Chumca A&z, 267 (1992) 73-80
Elsemer Science Pubbshers B V , Amsterdam
Wavelet transform for the evaluation of peak intensities
in flow-injection analysis
Department of Chemzcal Technology, Unzverszty of Twente, P 0 Box 217, 750OAE Enschede (Netherlands)
(Recerved 18th September 1991, revised manuscript received 13th Apn11992)
The appbcatlon of the wavelet transform m the deternunatlon of peak mtensltles 111flow-mjectlon analysis was
studled with regard to Its properties of mmumzmg the effects of nolSe and baselme dnft The results Indicate that for
white noise and a favourable peak shape a slgnal-to-noise ratio of 2 can be tolerated at the 5% error level, which
means that a slgmficant reduction m the detectlon lumt can be obtamed m comparison urlth the classlcal
signal-processing methods With regard to the Influence of a changmg baselme It was found that Its d c level has a
negligible effect, but a lmear or exponentially nsmg baselme mtroduces an error that depends on the chosen
frequency of the wavelet that ISused to determme the peak Intensity The optimum choice of this frequency, m turn,
depends on the shape of the peak that IS studied In this respect slgmficant dtierences were observed for pure
Gaussian and exponentially modified Gaussian peaks
Keywords Flow mJectlon, Slgnal processmg methods, Peak mtensltles, Wavelet transform
The mam hmltatlons m the determmatlon of
peak mtensltles m flow-inJectIon analysis (FIA)


Source: Al Hanbali, Ahmad - Department of Applied Mathematics, Universiteit Twente


Collections: Engineering