AI Article Synopsis
- A new demodulation algorithm has been developed for pressure sensing in optical fiber Fabry-Perot systems, focusing on recovering the absolute phase from a chosen monochromatic frequency.
- The algorithm utilizes Fourier transform techniques to determine the relative phase and interference order, allowing for accurate phase recovery through a linear fit of unwrapped phase-frequency data.
- Experimental results demonstrate that this method achieves a pressure measurement precision of 0.15 kPa, significantly outperforming existing phase slope-based algorithms by a factor of 13.
Article 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.
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| http://dx.doi.org/10.1364/OE.20.018117 | DOI Listing |
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