318
4 Speckle-Optical Methods and Devices for Studying …
were described needed for realization of these methods. Methods of amortization,
collecting and processing of speckle-interferometric measurements were studied,
and examples of developed complexes of apparatus for such automation were given.
In the article [89] after introduction into theory of general probability and random
processes, all the main questions of statistical optics are examined: theory of coherence of the first and higher orders, impact of partial coherence in systems forming
the image, influence of random heterogeneous media and theory of photoelectric
registration of light. The work [90] examines statistical characteristics of coherent
radiation scattered on rough surface concerning the task of non-contact determination
of frequency and amplitude of body vibrations.
Statistical characteristics of coherent radiation scattered by the rough body, which
moves in its plane due to the random law, are analyzed in the work [91]. On the
basis of this analysis, the ratio for spatiotemporal correlation function of fluctuation
intensity of scattered coherent radiation was obtained, which can serve as the basis
for the study of different types of movements of bodies. In the case of oscillatory
motion of body on several frequencies, the ratio for fluctuation intensity spectrum was
obtained. Experiments conducted with He–Ne laser radiation prove the possibility
of measurement of mechanical oscillations spectrum of the rough body through
registration of spectrum of intensity fluctuations of scattered radiation.
The authors of the work [92] state the theory of methods of holographic and
speckle-interferometry considering specific tasks and practical schemes of a device
that gives the possibility to implement these methods. In the work [93], the possibility of determination of plane rough surface vibration parameters is studied
according to statistic parameters of the image of dynamic speckles formed by it.
In particular, the expression for spatiotemporal correlation function of the generalized Wiener–Khintchin theorem for non-stationary processes was obtained, similarity ratio between spectrum of distribution of the scattered radiation and spectrum of vibration (in approximation of small amplitudes) was established. The result
was proved experimentally. The authors of the article [94] established theoretically
and experimentally connection between transversal velocity of gaseous flow and
frequency spectrum of intensity fluctuation of scattered on microheterogeneities laser
radiation. The suggested method is notable for sufficient sensitivity and simplicity
of realization.
4.1 Correlation and Spectral Characteristics of Dynamic
Speckle-Field Formed by Rotating Diffuser
Speckle movement is a combination of shift and boiling during rotation of diffusing
object as well as during uniform motion. At the same time, movement of speckles
is periodical as the same diffusers appear in the illuminated zone with every turn of
the diffuser.
4 Speckle-Optical Methods and Devices for Studying …
were described needed for realization of these methods. Methods of amortization,
collecting and processing of speckle-interferometric measurements were studied,
and examples of developed complexes of apparatus for such automation were given.
In the article [89] after introduction into theory of general probability and random
processes, all the main questions of statistical optics are examined: theory of coherence of the first and higher orders, impact of partial coherence in systems forming
the image, influence of random heterogeneous media and theory of photoelectric
registration of light. The work [90] examines statistical characteristics of coherent
radiation scattered on rough surface concerning the task of non-contact determination
of frequency and amplitude of body vibrations.
Statistical characteristics of coherent radiation scattered by the rough body, which
moves in its plane due to the random law, are analyzed in the work [91]. On the
basis of this analysis, the ratio for spatiotemporal correlation function of fluctuation
intensity of scattered coherent radiation was obtained, which can serve as the basis
for the study of different types of movements of bodies. In the case of oscillatory
motion of body on several frequencies, the ratio for fluctuation intensity spectrum was
obtained. Experiments conducted with He–Ne laser radiation prove the possibility
of measurement of mechanical oscillations spectrum of the rough body through
registration of spectrum of intensity fluctuations of scattered radiation.
The authors of the work [92] state the theory of methods of holographic and
speckle-interferometry considering specific tasks and practical schemes of a device
that gives the possibility to implement these methods. In the work [93], the possibility of determination of plane rough surface vibration parameters is studied
according to statistic parameters of the image of dynamic speckles formed by it.
In particular, the expression for spatiotemporal correlation function of the generalized Wiener–Khintchin theorem for non-stationary processes was obtained, similarity ratio between spectrum of distribution of the scattered radiation and spectrum of vibration (in approximation of small amplitudes) was established. The result
was proved experimentally. The authors of the article [94] established theoretically
and experimentally connection between transversal velocity of gaseous flow and
frequency spectrum of intensity fluctuation of scattered on microheterogeneities laser
radiation. The suggested method is notable for sufficient sensitivity and simplicity
of realization.
4.1 Correlation and Spectral Characteristics of Dynamic
Speckle-Field Formed by Rotating Diffuser
Speckle movement is a combination of shift and boiling during rotation of diffusing
object as well as during uniform motion. At the same time, movement of speckles
is periodical as the same diffusers appear in the illuminated zone with every turn of
the diffuser.