Wavelet transform for the evaluation of peak intensities in flow-injection analysis

✍ Scribed by M. Bos; E. Hoogendam

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 552 KB
• Volume: 267
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85008-t

✦ Synopsis

The appbcatlon of the wavelet transform m the deternunatlon of peak mtensltles 111 flow-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 IS used 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