An analysis has been carried out with respect to the errors incurred in the determination of the thermophysical characteristics of the high-energy heterogeneous material "aluminum-ammonium perchlorate-butyl rubber" and associated with the radiation transfer of energy in the heated layer under conditions corresponding to the realization of the laser-pulse method in the course of action of a fi nite-length collimated laser pulse on the material surface. The infl uence of the radiation absorption process on the magnitude of this error has been established.Introduction. One possible means of increasing the quality of the manufactured items of modern technology is the use, for their production, of heterogeneous materials with improved physicomechanical and energy properties as compared with traditional materials [1]. The effi ciency of using new materials in actual operating conditions depends, apart from everything else, on the accuracy with which their thermophysical characteristics are determined. In heating many heterogeneous materials, the heat is transferred in them not only due to heat conduction, which depends on both the composition and content of the mixture components, but also due to volume absorption in defi nite regions of the spectrum depending on the thermal radiation frequency.For the investigation of the thermophysical characteristics of materials in a moderate temperature range, it is worthwhile to use high-performance procedures such as the laser-pulse method [2,3], based on the model of absorption of a radiant energy pulse in a thin layer in the vicinity of the heated surface of a sample, and an approximate solution of a onedimensional heat conduction problem for an infi nite plate.From the thermogram of the sample surface opposite to that heated, the maximum superheating temperature T max and the time τ 0.5 of reaching half the maximum superheating temperature are determined [2], and the thermophysical characteristics of the material are calculated from the formulas a = 0.1388L 2 /τ 0.5 , c = Q/(T max ρL), and λ = acρ [2].The conditions of application of the laser-pulse method for determining the thermophysical characteristics of partially transparent homogenous materials are considered in [4][5][6]. It was established that on intensifi cation of the process of heating such a material as a result of radiative heat transfer in it, sizeable systematic errors may appear in the determination of its characteristics, as compared to the case of nontransparent materials [7]. It is shown that in the practical realization of the laserpulse method, restrictions are to be placed on the wavelengths of the incident radiation and absorption coeffi cients. However, until now no analysis of the errors in determining the thermophysical characteristics by the laser-pulse method has been made for heterogeneous high-energy materials [8], the process of the heating of which is accompanied by accumulation of heat not only due to heat conduction but also due to volume absorption in defi nite regions of the spectrum that...
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