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Related Concept Videos

Doppler Effect - II01:05

Doppler Effect - II

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
Doppler Effect - I00:56

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The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Dispersed single-phase-step Michelson interferometer for Doppler imaging using sunlight.

Xiaoke Wan1, Jian Ge

  • 1Department of Astronomy, University of Florida, Gainesville, Florida 32611, USA. xwan@astro.ufl.edu

Optics Letters
|October 9, 2012
PubMed
Summary
This summary is machine-generated.

A novel Michelson interferometer system uses a fiber array-fed spectrograph to create 59 Doppler sensing channels. This instrument achieves high Doppler sensitivity for solar spectral analysis and imaging applications.

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Area of Science:

  • Optics and Photonics
  • Solar Physics
  • Spectroscopy

Background:

  • Michelson interferometers are crucial for spectral analysis.
  • Existing phase-stepping interferometer spectrometers face challenges in multiplexing and data processing.
  • Fiber array-fed spectrographs offer enhanced light collection and spectral resolution.

Purpose of the Study:

  • To develop a novel Michelson interferometer system for Doppler sensing.
  • To leverage single-phase-step operation for improved multiplexing and data processing.
  • To demonstrate Doppler imaging capabilities using solar light.

Main Methods:

  • A Michelson interferometer was coupled with a fiber array-fed spectrograph.
  • The system operated in a single-phase-step mode across 59 Doppler sensing channels (510-570 nm).
  • Spectral templates and correlation functions were used to determine Doppler shifts from solar spectra.

Main Results:

  • The developed system successfully demonstrated Doppler imaging of a rotating cylinder.
  • An average Doppler sensitivity of approximately 12 m/s was achieved.
  • Individual channels exhibited Doppler sensitivities as high as 5 m/s.

Conclusions:

  • The single-phase-step Michelson interferometer spectrometer offers advantages in multiplexing and data processing.
  • The system provides sensitive Doppler measurements suitable for solar physics and imaging.
  • This approach advances Doppler sensing technology for spectral analysis.