4.10 Results and Conclusions
359
4.10 Results and Conclusions
1. Spectral and correlation characteristics of dynamic speckle-fields under longitudinal movement of diffuse objects were investigated in this chapter.
There were investigated statistical characteristics of intensity fluctuations of
dynamic speckles during dispersion of the Gaussian laser beam on the rotating
diffuser. It was investigated how the change of conditions of illumination and observation during longitudinal shift of the diffuser influences the spectral characteristics
of the dynamic speckle-field, and it was established the dependence of amplitude of
spectral harmonics and the area under intensity spectrum envelope on longitudinal
oscillation of the object. Optimal conditions of illumination and observation were
determined.
There was offered and realized determination method of longitudinal shift of
rotating diffusely scattering object, and the frequency and velocity of which are
unknown. A device for determination of linear longitudinal shifts of the surface was
developed and experimentally tested.
2. Forming process of speckle-interferograms of longitudinal shift was theoretically and experimentally investigated. Optimal conditions of observation of the interference pattern were established, and its localization area, plane of maximal contrast
from the aperture and optimal values of sizes of the filtering diaphragm were found.
The obtained theoretical and experimental data agree well with each other.
Theoretical conclusions about three-dimensional character of speckle-fields
trajectories were experimentally proved with the methods of speckle-interferometry
of longitudinal shift. A ratio was ascertained, which determines sensitivity of speckleinterferometry of longitudinal shift, and it was shown that it can be controlled at the
recording stage as well as at the stage of reconstruction of specklograms.
3. There were investigated statistical characteristics of dynamic speckle-field scattered by the diffuser in the longitudinal direction. The dependence was obtained,
which interconnects relative intensity of the n-th harmonic and the amplitude of
diffuser oscillations. A numerical simulation was conducted, and there was graphically obtained dependence of the amplitudes ratio of the first two harmonics on the
oscillation amplitude of the object under different parameters, which determine the
conditions of the diffuser illumination.
The possibilities of speckle-interferometry application for determining longitudinal components of shifts of diffuse objects were studied, dependence of interferograms on conditions of observation as well as optimal conditions of their obtaining
was determined, and character of adequate spatial filtering was ascertained.
A speckle-optics method was suggested and experimentally realized, which allow
determining not only the value, but also the direction of velocity of the diffusive
object.
Research methods of diffusive surfaces of physical and medical–biological
objects were developed. The methods give the possibility to determine deformations, velocity, shift and a number of other characteristics, which are not connected
359
4.10 Results and Conclusions
1. Spectral and correlation characteristics of dynamic speckle-fields under longitudinal movement of diffuse objects were investigated in this chapter.
There were investigated statistical characteristics of intensity fluctuations of
dynamic speckles during dispersion of the Gaussian laser beam on the rotating
diffuser. It was investigated how the change of conditions of illumination and observation during longitudinal shift of the diffuser influences the spectral characteristics
of the dynamic speckle-field, and it was established the dependence of amplitude of
spectral harmonics and the area under intensity spectrum envelope on longitudinal
oscillation of the object. Optimal conditions of illumination and observation were
determined.
There was offered and realized determination method of longitudinal shift of
rotating diffusely scattering object, and the frequency and velocity of which are
unknown. A device for determination of linear longitudinal shifts of the surface was
developed and experimentally tested.
2. Forming process of speckle-interferograms of longitudinal shift was theoretically and experimentally investigated. Optimal conditions of observation of the interference pattern were established, and its localization area, plane of maximal contrast
from the aperture and optimal values of sizes of the filtering diaphragm were found.
The obtained theoretical and experimental data agree well with each other.
Theoretical conclusions about three-dimensional character of speckle-fields
trajectories were experimentally proved with the methods of speckle-interferometry
of longitudinal shift. A ratio was ascertained, which determines sensitivity of speckleinterferometry of longitudinal shift, and it was shown that it can be controlled at the
recording stage as well as at the stage of reconstruction of specklograms.
3. There were investigated statistical characteristics of dynamic speckle-field scattered by the diffuser in the longitudinal direction. The dependence was obtained,
which interconnects relative intensity of the n-th harmonic and the amplitude of
diffuser oscillations. A numerical simulation was conducted, and there was graphically obtained dependence of the amplitudes ratio of the first two harmonics on the
oscillation amplitude of the object under different parameters, which determine the
conditions of the diffuser illumination.
The possibilities of speckle-interferometry application for determining longitudinal components of shifts of diffuse objects were studied, dependence of interferograms on conditions of observation as well as optimal conditions of their obtaining
was determined, and character of adequate spatial filtering was ascertained.
A speckle-optics method was suggested and experimentally realized, which allow
determining not only the value, but also the direction of velocity of the diffusive
object.
Research methods of diffusive surfaces of physical and medical–biological
objects were developed. The methods give the possibility to determine deformations, velocity, shift and a number of other characteristics, which are not connected