Holographic interferometry is employed to diagnose an unsteady natural convection flow. The advanced optical diagnostic technique not only clearly reveals the thermal boundary, thermal intrusion, circulating flow, stratified distribution of the steady flow, and their developing behaviors, but also facilitates a quantitative analyses of the temperature distribution, the thickness of the thermal boundary layer and the intrusion.
Sheng-Mao Tieng, Sheng-Mao Tieng,
"Flow diagnosis by using holographic interferometry", Proc. SPIE 3407, International Conference on Applied Optical Metrology, (29 September 1998); doi: 10.1117/12.323307; https://doi.org/10.1117/12.323307