Coherent Image Fringe Contrast Measurement with Sensing Arrays,

Abstract

Two methods are described for measuring interferometric fringe contrast with sensing arrays. The absence of air turbulence allows contrast to be determined quickly by measuring the intensity of the fringe pattern at phases 90 deg apart. The presence of turbulence requires that the peak-to-peak fringe intensity be found by sampling the fringes as they are scanned across the array. An analysis is presented showing the relation between maximum error in fringe contrast measurement and the number of samples taken. Experimental results are presented which show the effect of turbulence on fringe contrast measurement. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 22, 1981
Accession Number
ADA102644

Entities

People

  • William Seemuller

Organizations

  • Geospatial Research Laboratory

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Accuracy
  • Acquisition
  • Amplitude
  • Computers
  • Data Processing
  • Data Reduction
  • Electronic Equipment
  • Engineers
  • Frequency
  • Lasers
  • Measurement
  • Optical Correlators
  • Phase Shift
  • Photographs
  • Probability
  • Processing Equipment
  • Sine Waves

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Image Processing and Computer Vision.