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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.659 CiteScore™: 1.2

ISSN Imprimir: 2150-3621
ISSN On-line: 2150-363X

International Journal of Energy for a Clean Environment

Anteriormente Conhecido Como Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.2015015411
pages 225-233

EXCITATION PULSE WIDTH IN THE PEAK DIFFUSING METHOD FOR THERMAL DIFFUSIVITY MEASUREMENT

Huilong Dong
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Haidian District, Beijing 100084, P. R. China
Boyu Zheng
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Haidian District, Beijing 100084, P. R. China
Feifan Chen
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Haidian District, Beijing 100084, P. R. China

RESUMO

A peak diffusing method has been proposed lately to characterize the radial thermal diffusivity. This paper reports the latest research progress on the pulse width selection for a Gaussian laser which is utilized as the heat excitation for the peak diffusing method. A three-dimensional heat conduction model is constructed, and the alternating direction implicit (ADI) difference method is applied to calculate the temperature field evolution in the case of the finite pulse width. It is concluded from the numerical calculation results that the thermal diffusivity characterization accuracy will not be affected within the given pulse width. A measurement system is constructed with the finite pulsed Gaussian beam as a source of excitation and an IR camera as a temperature detector. Within the 10 ms to 200 ms ranged pulse width, the measured thermal diffusivity of titanium and zirconium plates show errors less than 7.7% and 6.9%, respectively, indicating that the measurement will not be influenced by the given pulse width range.


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