480
5 Laser Specklometer, Speckle-Optical Diagnostics and Laser …
Determining the vibration amplitude was conducted by registration with the help
of laser specklometer of the amplitude of the first spectral harmonic of fluctuation spectrum of the radiation intensity, scattered by diffuse surface, which makes
harmonic vibration, with further recalculation of amplitude values according to the
derived beforehand calibration curve.
The calibration of experimental model of laser specklometer was carried out
with the help of certified model of the laser Doppler vibrometer. During this,
relative error of the measurement of the amplitude of longitudinal component of
harmonic vibration amounted to not more than 5% and frequency of vibrations did not
exceed 4%.
The developed methods and means of the defining amplitude–frequency characteristics of vibrations of diffuse objects based on the analysis of time fluctuations of
the intensity of speckle-field formed as a result of the dispersion of laser radiation
by vibrating objects.
The derived results of the work testify the effectiveness of the usage of the developed method and device for the vibrations of a wide range of objects in real-time
scale.
Principal importance of the derived results consists in the fact that on their basis
in industry the possibility of the usage of remote, contactless sensors of location
and positioning appeared, study with the help of experimental model of laser specklometer of vibrating activity of the elements of technical items by relatively simple
and sufficiently cheap method.
The results of the work can be used for the studies of ultrasonic fields of acoustic
converters and oscillating systems, which are used in technological processes at the
enterprises of electronic industry, definitions of vibrating activity of the elements
of technical items, motor and tractor technology, developments of the location and
positioning sensors in the technology and robotics.
8. Contactless method for the estimation of muscle tone depending on functional
state of the organism was developed. The results of the studies of muscle-tonic
condition during the measurements of temporary spectra of fluctuations of intensity of laser radiation scattered on them were derived. The method of effective
removal of the influence of surface blood flow on the speckle-optical indicators
during the study of biomechanical characteristics of muscles was developed.
It is known that a muscle at its contraction creates low-frequency sound vibrations, the intensity of which depends on its functional condition. However, acoustic
measurements are hindered due to considerable noises in the low-frequency area.
The usage of laser radiation gives a wide range of advantages: first of all, contactless, remote, insensitive toward noises in the area of sound oscillations, high spatial
resolution.
It was found out that it is preferable to use integral parameters of spectra due
to their larger degree of stability. Besides, it is also reasonable to choose relative,
but not absolute parameters of spectra, and to create techniques of the study of
biophysical processes based on the comparative principle. The derived results can
5 Laser Specklometer, Speckle-Optical Diagnostics and Laser …
Determining the vibration amplitude was conducted by registration with the help
of laser specklometer of the amplitude of the first spectral harmonic of fluctuation spectrum of the radiation intensity, scattered by diffuse surface, which makes
harmonic vibration, with further recalculation of amplitude values according to the
derived beforehand calibration curve.
The calibration of experimental model of laser specklometer was carried out
with the help of certified model of the laser Doppler vibrometer. During this,
relative error of the measurement of the amplitude of longitudinal component of
harmonic vibration amounted to not more than 5% and frequency of vibrations did not
exceed 4%.
The developed methods and means of the defining amplitude–frequency characteristics of vibrations of diffuse objects based on the analysis of time fluctuations of
the intensity of speckle-field formed as a result of the dispersion of laser radiation
by vibrating objects.
The derived results of the work testify the effectiveness of the usage of the developed method and device for the vibrations of a wide range of objects in real-time
scale.
Principal importance of the derived results consists in the fact that on their basis
in industry the possibility of the usage of remote, contactless sensors of location
and positioning appeared, study with the help of experimental model of laser specklometer of vibrating activity of the elements of technical items by relatively simple
and sufficiently cheap method.
The results of the work can be used for the studies of ultrasonic fields of acoustic
converters and oscillating systems, which are used in technological processes at the
enterprises of electronic industry, definitions of vibrating activity of the elements
of technical items, motor and tractor technology, developments of the location and
positioning sensors in the technology and robotics.
8. Contactless method for the estimation of muscle tone depending on functional
state of the organism was developed. The results of the studies of muscle-tonic
condition during the measurements of temporary spectra of fluctuations of intensity of laser radiation scattered on them were derived. The method of effective
removal of the influence of surface blood flow on the speckle-optical indicators
during the study of biomechanical characteristics of muscles was developed.
It is known that a muscle at its contraction creates low-frequency sound vibrations, the intensity of which depends on its functional condition. However, acoustic
measurements are hindered due to considerable noises in the low-frequency area.
The usage of laser radiation gives a wide range of advantages: first of all, contactless, remote, insensitive toward noises in the area of sound oscillations, high spatial
resolution.
It was found out that it is preferable to use integral parameters of spectra due
to their larger degree of stability. Besides, it is also reasonable to choose relative,
but not absolute parameters of spectra, and to create techniques of the study of
biophysical processes based on the comparative principle. The derived results can