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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 7, Iss. 9 — Aug. 28, 2012

A polarized low-coherence interferometry demodulation algorithm by recovering the absolute phase of a selected monochromatic frequency

Junfeng Jiang, Shaohua Wang, Tiegen Liu, Kun Liu, Jinde Yin, Xiange Meng, Yimo Zhang, Shuang Wang, Zunqi Qin, Fan Wu, and Dingjie Li  »View Author Affiliations


Optics Express, Vol. 20, Issue 16, pp. 18117-18126 (2012)
http://dx.doi.org/10.1364/OE.20.018117


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Abstract

A demodulation algorithm based on absolute phase recovery of a selected monochromatic frequency is proposed for optical fiber Fabry-Perot pressure sensing system. The algorithm uses Fourier transform to get the relative phase and intercept of the unwrapped phase-frequency linear fit curve to identify its interference-order, which are then used to recover the absolute phase. A simplified mathematical model of the polarized low-coherence interference fringes was established to illustrate the principle of the proposed algorithm. Phase unwrapping and the selection of monochromatic frequency were discussed in detail. Pressure measurement experiment was carried out to verify the effectiveness of the proposed algorithm. Results showed that the demodulation precision by our algorithm could reach up to 0.15kPa, which has been improved by 13 times comparing with phase slope based algorithm.

© 2012 OSA

OCIS Codes
(050.2230) Diffraction and gratings : Fabry-Perot
(100.5070) Image processing : Phase retrieval
(110.4500) Imaging systems : Optical coherence tomography
(120.5475) Instrumentation, measurement, and metrology : Pressure measurement

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: May 25, 2012
Revised Manuscript: July 18, 2012
Manuscript Accepted: July 19, 2012
Published: July 23, 2012

Virtual Issues
Vol. 7, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Junfeng Jiang, Shaohua Wang, Tiegen Liu, Kun Liu, Jinde Yin, Xiange Meng, Yimo Zhang, Shuang Wang, Zunqi Qin, Fan Wu, and Dingjie Li, "A polarized low-coherence interferometry demodulation algorithm by recovering the absolute phase of a selected monochromatic frequency," Opt. Express 20, 18117-18126 (2012)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-20-16-18117


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