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Related Concept Videos

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Measuring Acceleration Due to Gravity

Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
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Related Experiment Video

Updated: Jun 20, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Practical fiber-optic-based submicro-g accelerometer free from source and environmental perturbations.

A S Gerges, T P Newson, D A Jackson

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    |September 16, 2009
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    This study introduces a new accelerometer using a weighted diaphragm and dual Fabry-Perot interferometers. This design significantly reduces errors from wavelength drift and temperature variations.

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    Area of Science:

    • Mechanical Engineering
    • Optical Metrology
    • Sensor Technology

    Background:

    • Accelerometers are crucial for measuring motion and vibration.
    • Existing accelerometers can be susceptible to environmental factors like temperature fluctuations and source wavelength drift.
    • Minimizing cross-coupling in the sensing element is essential for accurate measurements.

    Purpose of the Study:

    • To present a novel accelerometer design with enhanced stability and accuracy.
    • To detail the use of dual hemispherical Fabry-Perot interferometers for displacement sensing.
    • To quantify the reduction in environmental error compared to single interferometer systems.

    Main Methods:

    • A weighted diaphragm was designed as the primary sensing element to minimize cross-coupling.
    • Two miniature air-spaced Fabry-Perot interferometers were employed, positioned on opposite sides of the diaphragm.
    • Signal processing techniques were applied to the outputs of both interferometers.

    Main Results:

    • The novel accelerometer design demonstrated minimal cross-coupling in the sensing diaphragm.
    • Dual interferometer output processing significantly reduced wavelength drift effects by 45.8 dB.
    • Temperature variation effects were reduced by 27.3 dB compared to a single interferometer setup.

    Conclusions:

    • The developed accelerometer offers improved performance by mitigating common sources of error.
    • The dual Fabry-Perot interferometer approach provides a robust method for measuring diaphragm displacement.
    • This technology has potential applications in high-precision inertial sensing and navigation systems.