Contents

• Introduction.
• Qualitative description of the technique.
• Theory.
  • Scattered intensity and field power spectrum.
  • Scattering from a thin sample.
  • Image forming techniques
  • Misfocused microscopy and shadowgraph.
  • Scattering measurements by microscopy techniques
  • Gaussian field generated by the sum of many patterns.
  • Siegert relation for the near field speckles.
  • Vanishing of the correlations.
  • Homodyne near field speckles.
  • Heterodyne near field speckles.
  • Schlieren-like near field speckles.
  • Why using NFS instead of classical scattering measurement?
  • Why using NFS instead of classical microscopy?
  • Meaning of the light path correlation function.
  
  
• The experimental system.
  • The optical system.
  • The light source.
  • The cell.
  • Objective, beam stop and blade.
  • CCD sensor.
  • The acquisition and elaboration system.
  • ONFS and ENFS setup for colloid measurements.
  • SNFS setup for non equilibrium fluctuation measurements.
  
  
• ONFS data processing.
  • Effect of the stray light.
  • Correction for finite samples.
  • Data processing algorithm.
  
  
• ENFS and SNFS data processing.
  • Subtraction of the stray light
  • Correction for finite samples.
  • ENFS data processing.
  
  
• Performances of ONFS and ENFS on two colloidal samples.
  • The samples.
  • Measurements.
  • What is the main source of error?
  
  
• Particle sizing with ENFS.
• Non-equilibrium fluctuations in a free diffusion experiment studied with SNFS
  • Nonequilibrium fluctuations in free diffusion processes.
  • The cell.
  • Results.
  
  
• Three dimensional intensity correlation function.
  • Evolution equation of the field correlation.
  • Gaussian speckles.
  • Determination of the sign of the field correlation function.
  • Longitudinal correlation.
  
  
• Definitions
• Bibliography
• List of Figures
• List of Tables

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