Heat and flow visualization of low-density environments by laser holographic interferometry

Naoki Maruyama; Seizo Kato

doi:10.1117/12.212641

23 June 1995 Heat and flow visualization of low-density environments by laser holographic interferometry

Naoki Maruyama, Seizo Kato

Proceedings Volume 2545, Interferometry VII: Applications; (1995) https://doi.org/10.1117/12.212641
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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 P_c 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.

Citation Download Citation

Naoki Maruyama and Seizo Kato "Heat and flow visualization of low-density environments by laser holographic interferometry", Proc. SPIE 2545, Interferometry VII: Applications, (23 June 1995); https://doi.org/10.1117/12.212641

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