Raskovskaya, A. Optical-electronic complex for investigation of the processes of heat and mass transfer by laser contactless method Scientific Visualization Parameters determination of the diffusion layer of a liquid. Non-contact determination of body temperature by the position of the caustic singular points. Scientific Visualization, , volume 11, number 3, pages 43 - 53, DOI: Optical-electronic complex for investigation of the processes of heat and mass transfer by laser contactless method.
Authors: A. Vedyashkina 1 , B. Rinkevichyus 2 , I. Pavlov 3 , I.
Raskovskaya 4 , A. Tolkachev 5. The work is devoted to development and creation of an optoelectronic complex for determination of the inhomogeneous condensed media parameters, principle of which is based on the method of structured laser radiation caustics. This method is described for determining the parameters of diffusion layer of liquid according to the position of caustic surfaces during longitudinal probing by a plane laser beam.
Special software is presented that allows determining the distribution of the refractive index in the diffusion layer of liquid by comparing theoretically calculated and experimental refractograms. The results of the complex operation for the diffusion layer arising between the electrolyte solution and water for different concentrations of the electrolyte solution are shown.
New method for determining the temperature of the surface of a cold body placed in a transparent liquid is presented, it is based on determining the location of the singular points of caustic surfaces arising when the boundary layer is probed by the horizontal element of structured beam. Keywords : diffusion layer of liquid, refraction, caustic, laser refractography. For non-disturbing noncontact diagnostics of heat and mass transfer processes, optical refraction methods are well recommended. There are some advantages, first of all optical measurements do not distort the heterogeneity under investigation, as in most cases the energy absorbed by the medium is rather small.
Laser methods are low-inertia, which allows to perform accurate measurements of fast processes.
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Laser refraction methods allow us to investigate the field of the refractive index, which is then converted by indirect measurements into the sought field of another physical quantity . Based on the use of lasers, new methods were developed to diagnose liquid and gas flows, namely, the method of laser Doppler anemometry, anemometry using particle images, photoluminescent methods, and a number of others .
At present, instruments using such methods are widely used in aero-hydrodynamic and thermophysical experiments. In [3, 4], it was noted that for the diagnosis of stratified media under conditions of substantial refraction of optical radiation, it is advisable to use the method of laser refractography.
The method is based on recording the refractive displacement of structured laser radiation SLR which probes optical inhomogeneity. In this case, the SLR is used, which is formed using special optical elements directly at the output of the radiation source . This method of forming SLRs makes it possible to maintain its high coherence and to ensure a small divergence of the beams, which makes it possible to apply the concepts of geometric optics to describe SLIs. Structured beams are visualized in a section as a family of geometric figures, such as circles, line segments, or as a matrix of points.
The distortion of elements of structured beams resulting from refraction is an informative parameter for solving the inverse problem. Longitudinal probing of stratifications during measurements due to natural limitations in a full-scale experiment is used less frequently than traditional normal or oblique sounding, therefore caustics that occur in latter cases are mainly described in the literature.
Nevertheless, when studying and monitoring thermophysical, hydrodynamic and chemical processes in laboratory conditions at the interfaces between media, there are often conditions for the emergence of stratifications of various nature [6, 7], accompanied by significant gradients of the refractive index. In this case, the longitudinal sounding has proved to be very informative and it allows for the restoration of environmental parameters, including the cases, when caustics are produced and their geometric characteristics are later utilized.
The study of stratified media as well as transition diffusion layers is one of the important tasks of modern hydrophysics and oceanography. Stable density stratification is typical for natural reservoirs, including the World Ocean . Often it is caused by the non-uniform heating of the water column, as well as the distribution of salinity in depth. The study of hydrophysical flows is mainly based on laboratory modeling and is associated with the creation of density stratification, measurement and control of its characteristics.
Saline stratification is usually used in model laboratory experiments . Rinkevichyus 24 November Category: Engineering And Construction Academic. This monograph is devoted to the description of the physical fundamentals of laser refractography-a novel informational-measuring technique for the diagnostics of optically inhomogeneous media and flows, based on the idea of using spatially structured probe laser radiation in combination with its digital recording and c- puter techniques for the differential processing of refraction patterns.
Considered are the physical fundamentals of this technique, actual optical schemes, methods of processing refraction patterns, and possible applications. This informational technique can be employed in such areas of science and technology as require remote nonperturbative monitoring of optical, thermophysical, chemical, aerohydrodynamic, and manufacturing processes.
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