Nonlinear dynamic filtering of logarithmically amplified fringe signals in optical coherence tomography applied to paper measurements

Erkki Antero Alarousu*, V. Bilyk, I. Gurov, J. Hast, L. Krehut, R. Myllylä, A. Zakharov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Application of the nonlinear Kalman filtering method to logarithmically amplified low-coherence fringe signals measured from paper sample is considered. The experimental results of dynamic fringe envelope recovery in Optical Coherence Tomography (OCT) systems are demonstrated. The analogue fringe envelope and digital dynamic fringe envelope recoveries from the noisy signals are compared. The results show that nonlinear discrete Kalman filtering method can be applied to estimate envelopes of logarithmically transformed low-coherence fringe signals with high noise-immunity. Logarithmic amplification reduces quantization error while dealing with small signal values. The experimental results obtained demonstrate a possibility of pure digital signal processing in OCT.

Original languageEnglish (US)
Pages (from-to)31-36
Number of pages6
JournalOptika i Spektroskopiya
Issue number1
StatePublished - Oct 31 2006

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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