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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Optimized cross-correlation method for Brillouin frequency shift estimation in Brillouin scattering-based sensors.

Lijuan Zhao, Ruoyu Liang, Zhiniu Xu

    Applied Optics
    |May 13, 2021
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    Summary

    This study optimizes the cross-correlation method for faster Brillouin spectra measurement. An improved method reduces measurement time while maintaining high accuracy for Brillouin frequency shift estimation.

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    Area of Science:

    • Spectroscopy
    • Optical Physics

    Background:

    • The cross-correlation method offers low computational cost and noise immunity.
    • However, it suffers from long measurement times for Brillouin spectra, particularly with asymmetric frequency sweeps.

    Purpose of the Study:

    • To enhance the real-time performance of spectra measurement.
    • To investigate the impact of frequency sweep span, deviation, and step on Brillouin frequency shift (BFS) estimation errors.

    Main Methods:

    • Systematic investigation of frequency sweep parameters on BFS error.
    • Development of an estimation formula for optimal sweep span.
    • Proposal of an improved cross-correlation method based on the optimal sweep span.

    Main Results:

    • BFS error is sensitive to insufficient sweep span and sweep span deviation.
    • Error decreases with increasing sweep span, then stabilizes.
    • Linewidth and sweep span deviation significantly affect the optimal sweep span.

    Conclusions:

    • The proposed improved cross-correlation method ensures high BFS accuracy.
    • The new method significantly decreases measurement time compared to classic approaches.