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  • 1
    Electronic Resource
    Electronic Resource
    Thermal stress relaxation behavior in thin films under transient laser-pulse heating (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3749-3752 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transient laser pulse has been used to generate nonsynchronous change of temperature rise and thermal expansion in thin films. The transient process of thermal expansion is recorded by a photoelectric high-speed acquisition system. By comparison of the calculated temperature rise and thermal expansion, thermal stress relaxation processes in Al films of 20–50 μm thickness is obtained. This result shows that, for transient heating, thermal stress exists even in the case of uniform temperature distribution and free expansion. And also there is a transient high stress in thin films under high-speed heating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352907
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of finite absorption depth and infrared detector nonlinearity on thermal diffusivity measurement of thin films using the flash method (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4249-4253 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The flash method including the single- and double-ended method has gained widespread acceptance for measuring thermal diffusivity of thick foils (in millimeters) as well as thin films (in microns). However when the method is employed, some basic experimental conditions are assumed. In this paper, two of the assumptions, the finite absorption depth effect and the nonlinearity of the detector, are discussed in the situation of thin film samples. For the first one, the deviation of the factor ω1/2 (=π2αt1/2/L2) from 1.37 and the corresponding errors in deriving thermal diffusivity from t1/2 are discussed for various relative absorption depth δ. The result indicates criteria for the method to be available, that is, L(approximately-greater-than)10δ and L(approximately-greater-than)14δ for the double- and the single-ended method. For the second one, by considering the errors in voltage output of a (Hg, Cd)Te IR detector, how the factor ω1/2 deviates from 1.37 and the corresponding errors in thermal diffusivity measurement under various initial temperature conditions are discussed. The results are shown graphically and tabulated. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145377
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamic thermal expansion under transient laser-pulse heating (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 3113-3114 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An infrared radiation pyrometer for transient temperature measurement and a photoelectric installation for micrometric length-change measurement were developed. After being heated by a CO2 laser pulse of 0.1 μs, the transient temperature-rise history and length change of thermal expansion of 20–50 μm Al films during tens of microseconds were recorded. Nonsynchronous change of temperature and thermal expansion under transient heating was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105755
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Analytical solution of non-Fourier temperature response in a finite medium under laser-pulse heating (1996)
    Springer
    Heat and mass transfer 31 (1996), S. 359-363 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung  Für ein begrenztes Medium, dessen Oberfläche durch einen Laserpuls mit vorgegebenem zeitlichen Intensitätsverlauf beaufschlagt wird, konnte die aus der hyperbolischen Wärmeleitungsgleichung deduzierbare Temperaturwellenlösung gefunden werden. Mit Hilfe dieser analytischen Lösung läßt sich die Temperaturantwort, die Ausbreitung und Reflexion der durch einen solchen Wärmeimpuls ausgelösten Temperaturwelle für verschiedene Pulsdauern, Mediumdicken und Energieabsorptionstiefen untersuchen.
    Notes: Abstract  A temperature wave solution predicted by the hyperbolic heat equation is developed for a finite medium exposed to a surface heat flux of laser with an actual temporal profile. By using the analytical solution, the temperature response, the propagation and the reflection of the temperature wave due to such heat pulse are investigated for different pulse duration, thickness of the medium, and energy absorption depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050068
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Analytical solution of non-fourier temperature response in a finite medium under laser-pulse heating (1996)
    Springer
    Heat and mass transfer 31 (1996), S. 359-363 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Für ein begrenztes Medium, dessen Oberfläche durch einen Laserpuls mit vorgegebenem zeitlichen Intensitätsverlauf beaufschlagt wird, konnte die aus der hyperbolischen Wärmeleitungsgleichung deduzierbare Temperaturwellenlösung gefunden werden. Mit Hilfe dieser analytischen Lösung läßt sich die Temperaturantwort, die Ausbreitung und Reflexion der durch einen solchen Wärmeimpuls ausgelösten Temperaturwelle für verschiedene Pulsdauern, Mediumdicken und Energieabsorptionstiefen untersuchen.
    Notes: Abstract A temperature wave solution predicted by the hyperbolic heat equation is developed for a finite medium exposed to a surface heat flux of laser with an actual temporal profile. By using the analytical solution, the temperature response, the propagation and the reflection of the temperature wave due to such heat pulse are investigated for different pulse duration, thickness of the medium, and energy absorption depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184051
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of the Response Delay of the Measuring System on Thermal Diffusivity Measurement Using the Flash Method1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 495-502 
    Details
    ISSN: 1572-9567
    Keywords: flash method ; response delay ; thermal diffusivity ; time constant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This work investigates the effect of the response delay of a measuring system on a thermal diffusivity measurement. A model of an m th-order delay in the measuring system is introduced, and a general expression for the output of the system with temperature response as input is derived. The effect on the temperature response caused by such a system is discussed. As a practical example, a third-order measuring system is considered. The measured temperature responses of stainless steel foils are compared with those calculated with the model of a third-order delay system. Good agreement between the two results is shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006652117141
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  • 7
    Electronic Resource
    Electronic Resource
    An Inverse Analysis to Estimate Relaxation Parameters and Thermal Diffusivity with a Universal Heat Conduction Equation1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 553-561 
    Details
    ISSN: 1572-9567
    Keywords: inverse analysis ; Levenberg–Marquardt algorithm ; pulse heating ; relaxation parameters ; thermal diffusivity ; universal heat conduction model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper presents an inverse analysis for simultaneous estimation of relaxation parameters and thermal diffusivity with a universal heat conduction model by using temperature responses measured at the surface of a finite medium subjected to pulse heat fluxes. In the direct analysis, the temperature responses in a finite medium subjected to a pulse heat flux are derived by solving the universal heat conduction equation. The inverse analysis is performed by a nonlinear least-squares method for determining the two relaxation parameters and thermal diffusivity. Here, the nonlinear system of algebraic equations resulting from the sensitivity matrix is solved by the Levenberg–Marquardt iterative algorithm. The inverse analysis is utilized to estimate the relaxation parameters and the thermal diffusivity from the simulated experimental non-Fourier temperature response obtained by direct calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006664419866
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Transient Characteristics of Thermal Conduction in Dispersed Composites (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 1239-1251 
    Details
    ISSN: 1572-9567
    Keywords: criterion of homogeneity ; dispersed composites ; finite element method (FEM) ; laser flash method ; thermal conductivity ; thermal diffusivity ; steady-state comparison method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effective thermal conductivity of dispersed composites with a hot-melt-adhesive matrix, measured using the steady-state method, is compared with the apparent thermal conductivity calculated from the average heat capacity and from the thermal diffusivity measured by the laser-flash method. The transient effect has been observed obviously at higher volume percentages for various dispersed particle sizes and ratios of the thermal conductivity values of dispersed and continuous phases. All of the experimental results are compared with those calculated by existing models and by the finite element method (FEM). An attempt has been made to show how the criterion for the homogeneity of dispersed composites under transient conditions is affected by the percentages of dispersed phase, dispersed particle size, and ratio of the thermal conductivity values of dispersed and continuous phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022662314447
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    Paper (German National Licenses)
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