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Updated: May 22, 2026

Three-dimensional Super Resolution Microscopy of F-actin Filaments by Interferometric PhotoActivated Localization Microscopy (iPALM)
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Flat-fields in DASH interferometry.

Kenneth D Marr1, Chrisoph R Englert, John M Harlander

  • 1NRC Associate in residence at U.S. Naval Research Laboratory, Space Science Division, Code 7630, 4555 Overlook Avenue Southwest, Washington, District of Columbia 20375, USA.

Optics Express
|April 27, 2012
PubMed
Summary
This summary is machine-generated.

Flat-field variations in Doppler Asymmetric Spatial Heterodyne (DASH) spectrometers can affect fringe phase calculations for atmospheric wind velocity measurements. However, these effects often cancel out, leading to small uncertainties in derived wind speeds.

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Area of Science:

  • Atmospheric science
  • Optical physics
  • Spectroscopy

Background:

  • Interferogram analysis for atmospheric wind velocity is susceptible to measurement device inhomogeneities.
  • These device-specific variations are known as the "flat-field" and can introduce uncertainty.

Purpose of the Study:

  • To investigate the impact of the flat-field on measurements using a Doppler Asymmetric Spatial Heterodyne (DASH) spectrometer.
  • To assess the significance of flat-field effects on atmospheric wind velocity calculations.

Main Methods:

  • Analysis of fringe patterns in interferograms obtained with a DASH spectrometer.
  • Comparison of fringe phase calculations to determine wind velocity uncertainty.
  • Development of a method to determine the flat-field using system temperature variations.

Main Results:

  • The flat-field can significantly affect individual fringe phase calculations.
  • Uncertainty in derived wind velocity remains small due to the cancellation of flat-field effects across measurements.
  • A method for flat-field determination using temperature variations is presented.

Conclusions:

  • Accounting for the flat-field is recommended for accurate DASH data analysis.
  • The proposed temperature-based flat-field determination method is suitable for space-based instruments.