The light deflection characteristics of the measuring beam rays passing through the laminar thermal boundary layer developing along a heated flat plate is theoretically analyzed, and the additional fringe order shift and fringe displacement are compensated to estimate exact values of temperature and Nusselt number. The obtained values compensated for the deflection effect agree with the exact ones of a laminar forced convective heat transfer. The optimum image focal position of the TV-camera taking real-time interferograms is also determined to minimize the measurement error, and is found to be not fixed but to depend on the thermal condition.
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