Next:
Introduction.
Contents
Near Field Speckles
Doriano Brogioli
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
Contents
List of Figures
List of Tables
About this document ...
2003-01-09
correlations.