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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Druckformat: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v7.i4.60
14 pages

MULTIPOINT CALIBRATION TECHNIQUE OF LIQUID CRYSTAL THERMOMETRY AND ITS APPLICATION TO THREE- DIMENSIONAL TEMPERATURE MEASUREMENT OF THERMAL CONVECTION

S. Funatani
Department of Mechanical and Production Engineering, Niigata University, 8050 Ikarashi 2, Niigata 950-2181, Japan
Nobuyuki Fujisawa
Visualization Research Center, Niigata University, Niigata, Japan
T. Matsuura
Department of Mechanical System Engineering, Gunma University, 1-5-1 Tenjin, Kiryu 376-8515, Japan

ABSTRAKT

The temperature calibration technique of liquid crystal thermometry has been studied by various calibration methods in HSI color space and with the multipoint calibration technique to consider the viewing angle effect of the liquid crystals. The calibration errors for various calibration methods are evaluated on the basis of uniform temperature images obtained from the present experiment. It is found that the calibration errors are significantly reduced when the full-color HSI calibration is combined with multipoint calibration using the B-spline fitting technique. These calibration methods are applied to the measurement of a three-dimensional temperature field of thermal convection over a heated surface by scanning a light sheet and a camera and capturing a number of color images at various planar cross sections. The reconstructed temperature distributions show the generation of thermal structures over a heated surface, which indicates the usefulness of the present experimental methods.