Externally Dispersed Interferometry for Precision Radial Velocimetry
Externally Dispersed Interferometry (EDI) is the series combination of a fixed-delay field-widened Michelson interferometer with a dispersive spectrograph. This combination boosts the spectrograph performance for both Doppler velocimetry and high resolution spectroscopy. The interferometer creates a periodic spectral comb that multiplies against the input spectrum to create moire fringes, which are recorded in combination with the regular spectrum. The moire pattern shifts in phase in response to a Doppler shift. Moire patterns are broader than the underlying spectral features and more easily survive spectrograph blurring and common distortions. Thus, the EDI technique allows lower resolution spectrographs having relaxed optical tolerances (and therefore higher throughput) to return high precision velocity measurements, which otherwise would be imprecise for the spectrograph alone.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 940902
- Report Number(s):
- UCRL-JRNL-229908
- Journal Information:
- AAAC ExoPlanet Task Force subcommittee (requested by NSF, NASA), Amer. Astr. Soc. 211th Meeting, vol. 211, N/A, January 8, 2008, pp. 1, Journal Name: AAAC ExoPlanet Task Force subcommittee (requested by NSF, NASA), Amer. Astr. Soc. 211th Meeting, vol. 211, N/A, January 8, 2008, pp. 1
- Country of Publication:
- United States
- Language:
- English
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