OSA's Digital Library

Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 9 — Apr. 23, 2012
  • pp: 9535–9544

Flat-fields in DASH interferometry

Kenneth D. Marr, Chrisoph R. Englert, and John M. Harlander  »View Author Affiliations

Optics Express, Vol. 20, Issue 9, pp. 9535-9544 (2012)

View Full Text Article

Enhanced HTML    Acrobat PDF (798 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



When analyzing the fringe pattern of an interferogram to determine atmospheric wind velocities, inhomogeneities in the optical components and illumination can introduce uncertainty into the results. These variations in the image, which are generally characteristics of the measurement device, are commonly referred to as the “flat-field” of the system. In this work we discuss the effect of this flat-field on measurements made with a Doppler Asymmetric Spatial Heterodyne (DASH) spectrometer. It is found that the flat-field can have a significant effect on any single calculation of the fringe phase, but because the flat-field affects all measurements made with the same system, the uncertainty in the derived wind velocity, which is determined through a comparison of two interferogram fringe phases, typically remains small. Nonetheless, it is recommended to account for the flat-field when analyzing DASH data, if possible. To this end we discuss a method for determining the flat-field using only temperature variations of the system, which is particularly suitable for space-based instruments.

© 2012 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(100.2650) Image processing : Fringe analysis
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(110.2650) Imaging systems : Fringe analysis

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: January 23, 2012
Revised Manuscript: March 14, 2012
Manuscript Accepted: March 15, 2012
Published: April 11, 2012

Kenneth D. Marr, Chrisoph R. Englert, and John M. Harlander, "Flat-fields in DASH interferometry," Opt. Express 20, 9535-9544 (2012)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. Heliophysics Roadmap Team, “Heliophysics: The solar and space physics of a new era,” NASA Advisory Council, Washington DC, (2009).
  2. J. D. Huba, S. L. Ossakow, G. Joyce, J. Krall, and S. L. England, “Three-dimensional equatorial spread F modeling: zonal neutral wind effects,” Geophys. Res. Lett.36, L19106 (2009). [CrossRef]
  3. P. B. Hays, V. J. Abreu, M. E. Dobbs, and D. A. Gell, “The high-resolution Doppler imager on the Upper Atmosphere Research Satellite,” J. Geophys. Res.98, 10713–10723 (1993). [CrossRef]
  4. T. L. Killeen, Q. Wu, S. C. Solomon, D. A. Ortland, W. R. Skinner, R. J. Niciejewski, and D. A. Gell, “TIMED Doppler interferometer: overview and recent results,” J. Geophys. Res.111, A10S01 (2006). [CrossRef]
  5. J. W Meriwether, “Studies of thermospheric dynamics with a Fabry-Perot interferometer network: a review,” J. Astro. Sol. Terr. Phys.68, 1576–1589 (2006). [CrossRef]
  6. P. A. Greet, M. G. Conde, P. L. Dyson, J. L. Innis, A. M. Breed, and D. J. Murphy, “Thermospheric wind field over Mawson and Davis, Antarctica; simultaneous observations by two Fabry-Perot spectrometers of 630 nm emission,” J. Astro. Sol. Terr. Phys.61, 1025–1045 (1999). [CrossRef]
  7. G. G. Shepherd, G. Thuillier, W. A. Gault, B. H. Solheim, C. Hersom, J. M. Alunni, J. F. Brun, S. Brune, P. Charlot, L. L. Desaulniers, W. F. J. Evans, R. L. Gattinger, F. Girod, D. Harvie, R. H. Hum, D. J. W. Kendall, E. J. Llewellyn, R. P. Lowe, J. Ohrt, F. Pasternak, O. Peillet, I. Powell, Y. Rochon, W. E. Ward, R. H. Wiens, and J. Wimperis, “WINDII, the wind imaging interferometer on the Upper Atmosphere Research Satellite,” J. Geophys. Res.98, 10725–10750 (1993). [CrossRef]
  8. G. G. Shepherd, R. G. Roble, C. McLandress, and W. E. Ward, “WINDII observations of the 558 nm emission in the lower thermosphere: the influence of dynamics on composition,” J. Astro. Sol. Terr. Phys.59, 655–667 (1997). [CrossRef]
  9. C. R. Englert, D. D. Babcock, and J. M. Harlander, “Doppler asymmetric spatial heterodyne spectroscopy (DASH): concept and experimental demonstration,” Appl. Opt.46, 7297–7307 (2007). [CrossRef] [PubMed]
  10. J. M. Harlander, R. J. Reynolds, and F. L. Roesler, “Spatial heterodyne spectroscopy for the exploration of diffuse interstellar emission lines at far-ultraviolet wavelengths,” Astrophys. J.396, 730–740 (1992). [CrossRef]
  11. J. M. Harlander, C. R. Englert, D. D. Babcock, and F. L. Roesler, “Design and laboratory tests of a Doppler asymmetric spatial heterodyne (DASH) interferometer for upper atmospheric wind and temperature observations,” Opt. Express18, 26430–26440 (2010). [CrossRef] [PubMed]
  12. C. R. Englert, J. M. Harlander, J. T. Emmert, D. D. Babcock, and F. L. Roesler, “Initial ground-based thermospheric wind measurements using Doppler asymmetric spatial heterodyne spectroscopy (DASH),” Opt. Express18, 27416–27430 (2010). [CrossRef]
  13. C. R. Englert and J. M. Harlander, “Flatfielding in spatial heterodyne spectroscopy,” Appl. Opt.45, 4583–4590 (2006). [CrossRef] [PubMed]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


Fig. 1 Fig. 2 Fig. 3
Fig. 4

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited