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Proceedings Paper

Heat and flow visualization of low-density environments by laser holographic interferometry
Author(s): Naoki Maruyama; Seizo Kato
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Paper Abstract

In this paper, an attempt is made to visualize the temperature fields developing under a low density environment with the aid of a laser holographic interferometer. The objectives of this paper are to confirm the environmental pressure effects onto the fringe formation and to analytically establish an evaluation procedure for a taken interferogram to estimate local temperatures, in which the refractive index of air depends on not only the temperature but also the pressure. In the interferogram analysis, the axial-symmetric 3D temperature field formed under the various environmental pressures is divided into infinitesimal sub thin rings and the respective refractive index, namely the local temperature, is expressed as a function of fringe order shifts and the environmental pressure. Then the validity of this procedure is verified by the experiment. In the experiment, the temperature fields at the low density environments are realized by natural convection developing under a circular disk cooled by a thermoelectric cooling device, which is set in a chamber evacuated by a vacuum pump. The chamber pressures are varied from Pc approximately equals 0 mmHg to atmospheric pressure and the interferograms are taken for the conditions. As the results, the critical pressures for the visualization and for the temperature estimation of this system are well designated and the procedure for temperature estimation proposed here is considered to be reasonable.

Paper Details

Date Published: 23 June 1995
PDF: 7 pages
Proc. SPIE 2545, Interferometry VII: Applications, (23 June 1995); doi: 10.1117/12.212641
Show Author Affiliations
Naoki Maruyama, Mie Univ. (Japan)
Seizo Kato, Mie Univ. (Japan)


Published in SPIE Proceedings Vol. 2545:
Interferometry VII: Applications
Ryszard J. Pryputniewicz; Gordon M. Brown; Werner P. O. Jueptner, Editor(s)

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