International Scientific Laboratory for Laser-Optical Diagnostics in Service for Nondestructive Materials Testing

Белый, В. Н.; Казак, Н. С.; Хило, Н. А.; Kroening, M.; Schreiber, J.

doi:10.3139/120.110077

Cited by 1 publication

(3 citation statements)

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“…The simplest case of relationship of thermal expansion and spatial-temporal dynamics of speckles has been discussed above related to the Eq. (8). But here the possibility to measure CTD does not exist.…”

Section: Investigation Of Thermal Expansionmentioning

confidence: 93%

“…Eq. (8) shows that the measurement of speed of speckles shifts allows one to calculate integrated thermo-physical parameter of material μ α p c .…”

Section: Investigation Of Thermal Expansionmentioning

confidence: 99%

“…The shift of speckles will lead to the shift of maxima of this correlation function. For measuring the speckles distortions it can use the second type of correlation function [8] The presence of spatial temperature gradient in the specimen causes the occurrence of heat flow which is accompanied with thermal expansion of the material. The temperature gradient region is additionally illuminated with a coherent laser beam.…”

Section: Investigation Of Thermal Expansionmentioning

confidence: 99%

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A speckle-photometry method of measurement of thermal diffusion coefficient of porous anodic alumina structures intended for optical sensing

et al. 2011

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A highly ordered structure and a relatively simple method of obtaining porous anodic alumina (PAA) have been attracting the attention of researchers to the potentialities of using such material in various fields of science and technology. The PAA-technology is oriented to mass production, does not require the use of expensive modern lithography and evaporation equipment. The technology makes it possible to produce PAA layers in a wide thickness range (0.1 -800 μm) and with a spatially ordered system of pores whose diameter and periodicity can be changed within the range from tens to hundreds of nanometers. By filling nanopores with conductive, semiconductive and dielectric materials or their combinations, possibilities arise of making micro-sensors based on various physical, chemical and biological effects. For numerous applications, there is a promising development direction associated with modification of PAA structures with nano-diamonds. To control the modification process and for subsequent use of films in energyabsorbing sensor systems, a real-time measurement is required of their thermal and physical parameters, and, in particular, the coefficient of thermal diffusion (CTD).In this report an optical method for determining CTD is developed which is based on an analysis of the spatialtemporal dynamics of the speckle field. The proposed method for measuring the coefficient of thermal diffusion is based on the measurement of an average speed of the speckle-field movement along the specimen surface. Due to statistical nature of speckles, their movement must be also described statistically. Our approach consists in the use of correlation functions describing the degree of change in a speckle-image of some element of the surface in the process of heating or cooling. The proposed method is fully optical, fast, non-invasive and can be customized for specific applications. Optical measurement of CTD has been carried out for PAA structures both modified and not modified with nano-diamonds. High resolution allows one to measure spatial inhomogeneities of thermophysical properties of PAA-films.

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Section: Investigation Of Thermal Expansionmentioning

confidence: 93%

“…Eq. (8) shows that the measurement of speed of speckles shifts allows one to calculate integrated thermo-physical parameter of material μ α p c .…”

Section: Investigation Of Thermal Expansionmentioning

confidence: 99%

Section: Investigation Of Thermal Expansionmentioning

confidence: 99%

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