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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Fiber optic displacement sensor with subangstrom resolution.

S Breen, B E Paton, B L Blackford

    Applied Optics
    |June 18, 2010
    PubMed
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    A novel Fabry-Perot interferometer utilizing a fiber optic coupler achieved low noise levels, enabling precise measurements of reflector displacements. This advancement offers a simpler, more sensitive approach for optical sensing applications.

    Area of Science:

    • Optics and Photonics
    • Fiber Optic Sensing
    • Interferometry

    Background:

    • Fabry-Perot interferometers are crucial for precise measurements.
    • Traditional interferometers can be complex and sensitive to environmental factors.
    • Integrating fiber optics offers potential for miniaturization and improved stability.

    Purpose of the Study:

    • To describe a simple Fabry-Perot interferometer design.
    • To utilize a single-mode bidirectional fiber coupler as a beam splitter.
    • To evaluate the noise performance and sensitivity of the developed interferometer.

    Main Methods:

    • Constructed a Fabry-Perot interferometer using a single-mode bidirectional fiber coupler.
    • Employed a high-stability Helium-Neon (He-Ne) laser as the light source.

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  • Focused laser light onto the optical fiber for interferometer operation.
  • Measured noise levels within a specific bandwidth (0.02-1 kHz).

    • Main Results:

    • Achieved noise levels equivalent to 0.5-Å root mean square (rms) reflector displacements.
    • Demonstrated the effectiveness of the fiber optic coupler as a beam splitter.
    • Confirmed stable operation with a high-stability He-Ne laser.

    Conclusions:

    • The developed fiber-optic Fabry-Perot interferometer is a simple yet effective design.
    • The system exhibits low noise levels, suitable for sensitive displacement measurements.
    • This approach offers a promising alternative for optical sensing applications requiring high precision.