Propagation of a heat pulse in a bounded conducting medium: Thermoelectric detection

Carballo-Sánchez, A. F.; Gurevich, Yu. G.; Logvinov, G. N.; Drogobitskii, Yu. V.; Titov, O. Yu.

doi:10.1134/1.1130821

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…Similar results can be found in many problems related to heat propagation in materials following the absorption of laser pulses [18][19][20], such as the transient heat transport by electrical carriers and phonons in semiconductors [21,22], among others. Figure 2 shows open circles with typical heating and cooling curves measured on a 500µm thick copper sample in vacuum of 4 × 10 −3 Torr and room temperature of 300 K. The results of measurements at atmospheric pressure on the same sample are plotted as full circles for comparison purposes.…”

Section: Consideration Of Heat Conductionsupporting

confidence: 66%

Specific Heat Measurements by a Thermal Relaxation Method: Influence of Convection and Conduction

et al. 2006

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This paper involves the well-known thermal relaxation method for measurement of the specific heat (c) of thin solid samples. Although this method was applied successfully in recent years for the characterization of different materials, in this work some aspects that must be taken into account in order to avoid problems based on satisfying the required experimental conditions of heat flux imposed by the physical model used for data analysis and processing will be discussed. For this purpose, for a given experimental geometry, the heat diffusion equation will be solved in order to obtain the sample's requirements for reliable measurements of c, regarding its thickness and thermal conductivity. An experimental device is described that can be used for the study of the influence of heat dissipation by convection on the method. A computer simulation was performed for comparing the simple model with one that takes to in account the gradient of temperature inside the sample. The results of measurements are presented.

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Section: Consideration Of Heat Conductionsupporting

confidence: 66%

Specific Heat Measurements by a Thermal Relaxation Method: Influence of Convection and Conduction

et al. 2006

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“…One of them depends on the phonon parameters only, and coincides with the nonequilibrium temperature in an insulator. 4 The second one depends on both the electron and phonon parameters and describes the influence of the electron subsystem on the nonstationary phonon temperature field.…”

Section: Main Equations and General Resultsmentioning

confidence: 99%

“…The pulse was defined in the problem with one type of the heat carrier as ''long'' when its duration is essentially greater than the single characteristic time 0 . 4 In the opposite case Ӷ 0 , the pulse was defined as ''short''. The temperature distributions are qualitatively different for both of these cases.…”

Section: Discussion Of Numeric Calculationsmentioning

confidence: 99%

Electron and phonon temperature relaxation in semiconductors excited by thermal pulse

Gurevich

Logvinov

Carballo-Sánchez

et al. 2002

Journal of Applied Physics

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Electron and phonon transient temperatures are analyzed in the case of nondegenerate semiconductors. An analytical solution is obtained for rectangular laser pulse absorption. It is shown that thermal diffusion is the main energy relaxation mechanism in the phonon subsystem. The mechanism depends on the correlation between the sample length l and the electron cooling length l ⑀ in an electron subsystem. Energy relaxation occurs by means of the electron thermal diffusion in thin samples (lӶl ⑀ ), and by means of the electron-phonon energy interaction in thick samples (lӷl ⑀ ). Characteristic relaxation times are obtained for all the cases, and analysis of these times is made. Electron and phonon temperature distributions in short and long samples are qualitatively and quantitatively analyzed for different correlations between the laser pulse duration and characteristic times.

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“…͑10͒ does not depend on the light absorption coefficient and reduces to the equation obtained in Ref. 7. In this work, it has been supposed a priori the surface absorption of the light pulse.…”

Section: A the Ideal Adiabatic Insulation "\ؕ…mentioning

confidence: 96%

Nonstationary temperature distribution caused by bulk absorption of laser pulse

Gurevich

Logvinov

Rivera

et al. 2003

Review of Scientific Instruments

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Propagation of a heat pulse in a bounded conducting medium: Thermoelectric detection

Cited by 7 publications

References 8 publications

Specific Heat Measurements by a Thermal Relaxation Method: Influence of Convection and Conduction

Specific Heat Measurements by a Thermal Relaxation Method: Influence of Convection and Conduction

Electron and phonon temperature relaxation in semiconductors excited by thermal pulse

Nonstationary temperature distribution caused by bulk absorption of laser pulse

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