Mykhaylo P. Gorsky

Study of speckle-field dynamics scattered by surface of concrete during congelation

Thorough description of diaphragm size selection for detecting the intensity of laser beam scattered on surface of congelating cement was given. Also fluctuations of speckle-field and its connection with square derivative of intensity were investigated. Analysis was based on CCD images of speckle-field dynamics in process of cement hydratation.

Cement hardening investigation by method of piezoelectric photoacoustics

Piezoelectric photoacoustics application possibility for concrete hydration stages determination has been analyzed. Cement sample placed on a transparent base was irradiated by laser beam. The acoustic signal from base transformed by piezoelectric converter into electric signal and through the amplifier moved in recorder device. The accent was on research and transient modelling with a pulse laser irradiation. Accent has been made to thermal conductivity measurement of cement during hydration process and its connection with hydration stages.

Coherent light absorbing by concrete during its hardening

In this work changes of concrete reflection coefficient during its hydration were investigated theoretically and experimentally. Diffuse approximation method for concrete light-scattering description during hydration was used and its results were compared with received experimental data. Calculation of scattered and absorption sections for set of particles is described in details. Introduced optical diagnostics method allows performing earlier hydration stages diagnostics of concrete hardening process in comparison with other methods and predicting mechanical properties of produced concrete.

Dynamic coherent light scattering by the cement with carbon nanotubes during hydration process

This paper is devoted to simulation of speckle field dynamics during coherent light scattering by cement surface in the process of hydration. Accent is made on cement which includes carbon nanotubes. Such inclusion promises significant increase of concrete mechanical properties qualities. Cement particles are represented by the spheres whose sizes and reflection indices are changing during the hydration process. Carbon nanotubes affect speed of hydration process for surrounding particles. It is shown that intensity fluctuations of scattered coherent radiation is suitable technique for the analysis both fast and slow processes of mineral binders hydration and forming polycrystalline structures in the process of hardening. The results of simulation are in good agreement with the experimental data.

Laser radiation scattering by the cement in the process of setting and hardening

This report is devoted to simulation of speckle field dynamics during coherent light scattering by the cement surface in the process of setting and hardening. Cement particles are represented by the spheres, which sizes and reflection indexes are changing during the hydration process. The study of intensity fluctuations of scattered coherent radiation – it is a technique, that is quite suitable for the analysis not only fast, but also slow processes of mineral binders hydration and polycrystalline structures creation in the process of hardening. The results of simulation are in good agreement with the experimental results.

Application of speckle-field images processing for concrete hardening diagnostics

This paper is devoted to processing of speckle field images dynamics during coherent light scattering by the cement surface in the process of hydration (hardening). Experimentally obtained set of images were processed by different methods including Fourier transform, Wavelet analysis, statistical moments and deviation calculation. Results of each analysis were evaluated in order to select best image processing approach. Deviation method has been selected like most accurate and less resource consuming one. It allows fast and accurate determining of concrete hardening stages by optical method

Correlation-optical method for cement particle size definition

Optical correlation technique of cement particle size distribution determining is described. It is based on transverse coherent function measuring using a polarization transverse shearing interferometer. It is shown that set of particles with random form can be substituted with set of spherical particles. This result was obtained by simulation of different particles sets with different forms and orientations. The proposed technique of data processing decreases dependence of the result on interferometer noise, emission source intensity fluctuations and difference of refractive index magnitudes of different cement particles. Described technique allows fast and reliable determining the size distribution function of cement particles.

Statistic analysis of topological transformation of birefringent structure matrix images of biological tissues

The paper deals with investigating the processes of laser radiation transformation by biological crystals networks using the singular optics techniques. The results obtained showed a distinct correlation between the points of characteristic values of coordinate distributions of Mueller matrix elements and polarization singularities (S- and C-points) of laser transformation of biological crystals networks with the following possibility of Mueller-matrix selection of polarization singularity. The technique of Mueller-matrix singular diagnostics of pathological changes of womens reproductive sphere tissue (myometrium) is proposed.

Computer simulation of coherent light scattering by cement in the process of hydration

This paper is devoted to simulation of speckle field dynamics during coherent light scattering by the cement surface in the process of hydration. Cement particles are represented by the spheres which sizes and reflection indexes are changing during the hydration process. The results of this simulation are in good agreement with the experimental results.

Light absorptions of concrete during its hydration

In this work changes of concrete integral reflection coefficient during its hydration were investigated theoretically and experimentally. Diffuse approximation method for concrete light-scattering description during hydration was used and its results were compared with received experimental data. Introduced optical diagnostics method allows performing earlier hydration stages diagnostics of concrete hardening process in comparison with other methods and predicting mechanical properties of produced concrete.