An optimised instrument to measure thermal diffusivities of gases with opto-acoustic spectroscopy

被引:1
作者
Soldner, J [1 ]
Stephan, K [1 ]
机构
[1] Univ Stuttgart, Inst Tech Thermodynam & Thermal Proc Engn, D-70550 Stuttgart, Germany
关键词
opto-acoustics; photo-acoustics; thermal diffusivities; thermal conductivity; photo-acoustic cell;
D O I
10.1016/j.ijthermalsci.2004.03.003
中图分类号
O414.1 [热力学];
学科分类号
摘要
The paper describes the theory and application of opto-acoustics to determine thermal diffusivities of gases. An experimental device, already described in previous papers of the authors [Internal. J. Thermophys. 19 (1998) 1099; Proc. 2nd European Thermal Science and 14th UIT National Heat Transfer Conf., 1996, pp. 1071-1078] permitted the detection of thermal diffusivities of gases at moderate pressures with an experimental uncertainty of about +/-1.25%.Based on the experience gained with this device, a comprehensive error analysis is presented in this paper. It shows how the experimental uncertainties can be considerably reduced to about -0.45 to +0.35%. The parameters for optical cell design are dealt with, as well as the appropriate characteristics, such as frequencies of the modulated laser beam, and the microphone used in the experiment. (C) 2004 Elsevier SAS. All rights reserved.
引用
收藏
页码:1037 / 1046
页数:10
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