The measurement of 3-D asymmetric temperature field by using real time laser interferometric tomography |
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Authors: | Wang Dezhong Zhuang Tiange |
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Institution: | a School of Power and Energy Engineering, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China;b School of Life Science & Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China |
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Abstract: | A real time nondestructive temperature measurement technique based on laser holographic interference tomography technique is presented. An He–Ne laser is used as light source, and a CCD video camera is used to grab the interferogram. This laser holographic tomography technique is applied to the measurement of the temperature fields generated by two heated rods. Since data error is inevitable in engineering measurement, it is necessary to study the reconstruction techniques for reconstructing the temperature field. Three techniques including convolution back projection (CBP), algebra reconstruction technique (ART) and simultaneous iterative reconstruction technique (SIRT) are studied. Based on the reconstruction techniques and experimental situation, ART is used to reconstruct the asymmetric temperature fields. The thermocouples are used to measure the temperatures of the two heated rods. Comparing the reconstructed result with the measured temperature value, a satisfactory result is obtained. |
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Keywords: | 3-D temperature measurement Laser computed tomography Image reconstruction technique Real time measurement |
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