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How does Median Baseline Filter (MBF) work for UV and PDA detectors ? - WKB67349

Article number: 67349

ENVIRONMENT

  • 2489 UV/VIS Detector
  • 2996 PDA Detector
  • 2998 Photodiode Array Detector
  • ACQUITY UPLC Tunable UV Detector
  • ACQUITY UPLC PDA Detector
  • ACQUITY UPLC PDA eλ Detector

ANSWER

Median Baseline Filter (MBF) is a digital filter that reduces the effects of unwanted baseline curvatures.

The algorithm works in three steps, as shown in the block diagram.

MBF block schematic.jpg
1) Median Filter
The raw chromatographic signal is input to the median filter, which removes the chromatapgic peaks. This leaves an approximation of the baseline.
2) Smoothing Filter
The median-filtered baseline is input to the Smoothing Filter. This filter eliminates high frequency noise and results in the model baseline.
3) Subtraction
The model baseline is subtracted from the raw chromatogram to obtained the MBF compensated chromatogram.

MBF process.jpg

ADDITIONAL INFORMATION

 

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