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Related Experiment Video

Updated: Jun 12, 2026

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
07:22

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Published on: February 3, 2023

Optimization of a triple etalon interferometer.

W R Skinner, P B Hays, V J Abreu

    Applied Optics
    |May 22, 2010
    PubMed
    Summary
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    The High Resolution Doppler Imager (HRDI) uses a triple etalon Fabry-Perot interferometer to measure atmospheric winds. Key etalon spacings and reflectivity requirements were determined for accurate stratospheric and mesospheric wind vector measurements.

    Area of Science:

    • Atmospheric physics and remote sensing.
    • Optical instrumentation and interferometry.

    Background:

    • The High Resolution Doppler Imager (HRDI) is an instrument aboard the Upper Atmosphere Research Satellite.
    • HRDI utilizes a triple etalon Fabry-Perot interferometer to measure Doppler shifts in atmospheric O(2) rotational lines.
    • Accurate wind vector determination in the stratosphere and mesosphere is crucial for atmospheric modeling.

    Purpose of the Study:

    • To detail the methodologies for determining the gap thicknesses and reflectivities of HRDI's three etalons.
    • To establish critical parameters for optimizing wind vector measurements using the HRDI instrument.

    Main Methods:

    • Analysis of optical principles governing triple etalon Fabry-Perot interferometers.
    • Calculation of etalon gap thicknesses and reflectivity values necessary for HRDI's operational requirements.

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  • Investigation into the impact of etalon parameters on measurement accuracy.

    • Main Results:

    • The determined etalon gap thicknesses are 1.000 cm, 0.186 cm, and 0.025 cm.
    • These spacings were found to be independent of etalon reflectivity.
    • Nearly equal reflectivities for all three etalons are recommended to minimize wind measurement errors due to mistuning.

    Conclusions:

    • The precise calibration of etalon spacings and appropriate reflectivity selection are vital for HRDI's wind measurement capabilities.
    • Reflectivity values below approximately 0.90 have a limited impact on the statistical error of wind measurements.
    • The study provides essential technical specifications for the HRDI instrument, contributing to the understanding of upper atmospheric dynamics.