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Performance evaluation of a thermal Doppler Michelson interferometer system.

Reza Mani1, Steven Dobbie, Alan Scott

  • 1Centre for Research in Earth and Space Science, York University, Toronto, Ontario M3J 1P3, Canada. rmani@stpl.cress.yorku.ca

Applied Optics
|December 2, 2005
PubMed
Summary

Stratospheric Wind Interferometer for Transport studies (SWIFT) uses a thermal Doppler Michelson interferometer to measure stratospheric winds. This study reports on the test bed results of this novel instrument.

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Area of Science:

  • Atmospheric science
  • Optical physics
  • Remote sensing

Background:

  • Stratospheric wind measurements are crucial for understanding atmospheric dynamics and transport.
  • Existing satellite instruments have limitations in measuring wind velocities across the desired altitude range.
  • The Stratospheric Wind Interferometer for Transport studies (SWIFT) is a proposed limb-viewing satellite instrument designed to address these limitations.

Purpose of the Study:

  • To investigate the behavior of individual components and their combination within the SWIFT instrument's test bed.
  • To assess the feasibility of using a thermal Doppler Michelson interferometer for stratospheric wind velocity measurements.
  • To report on the performance and results obtained from the SWIFT instrument test bed.

Main Methods:

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  • Utilizing a thermal Doppler Michelson interferometer as the primary sensing element.
  • Employing narrowband tandem etalon filters made of germanium for spectral line selection in the thermal spectrum.
  • Applying phase-stepping interferometry, a technique also used by the Wind Imaging Interferometer.
  • Detecting Doppler shifts caused by winds using a thermal emission line of ozone near 9 micrometers.

Main Results:

  • Successful setup and operation of a test bed including the Michelson interferometer and etalon filters.
  • Investigation into the performance characteristics of individual instrument components.
  • Analysis of the combined behavior and performance of the integrated interferometer and filter system.
  • Reporting of preliminary results from the test bed experiments.

Conclusions:

  • The test bed setup provides a foundation for evaluating the SWIFT instrument's capabilities.
  • The study demonstrates the potential of the thermal Doppler Michelson interferometer for stratospheric wind measurements.
  • Further development and validation are necessary to fully realize SWIFT's potential for atmospheric transport studies.