Abstract
A novel measurement technique to visualize the spatial temperature distribution of a non-isothermal flow is developed. Two-dimensional temperature profiles are obtained by quantitatively tracking the path of a rod-type probe with a high-speed CCD camera, and superimposing it on the image of a measured object photographed by the same camera. The rod-type probe consists of 8 two-thermocouple sensors set in line. Each two-thermocouple sensor used in the present experiment is composed of two fine-wire thermocouples (type K) of unequal diameters, i.e., 51 μm and 76 μm, respectively. The key technique is an adaptive response-compensation scheme by which the response lag of the temperature sensors can be adequately compensated; hence the temperature profile can be reconstructed accurately. It is demonstrated that the non-isothermal field can be visualized readily and quantitatively.
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