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Application of digital holography to circle flow bed boiler measurement |
| PU Shiliang1, WANG Qinghui1, CEN Kefa1, Denis Lebrun2, REN Kuanfang2 |
| 1.Clean Energy and Environment Engineering Key Laboratory of MOE, Zhejiang University, Hangzhou 310027, China; 2.UMR 6614CORIA, Technopole du Madrillet, 76801 Saint-Etienne du Rouvray, France |
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Abstract The spatial distribution of particles in the boiler is very important in the study on the circle flow bed boiler (CFB). Digital in-line holography technique was applied to obtain the spatial and diameter distribution of the particles inside the boiler. A HE-NE laser was used to illuminate the particles inside the CFB through two glass windows and the in-line diffraction pattern was recorded by a CCD camera. The diffraction can be interpreted as a convolution between a family of wavelet functions and the object function. So the three-dimensional (3D) images of the particles in the two-phase flow were reconstructed by the convolution between diffraction pattern and wavelet functions. The particle diameters and 3D coordinates were calculated from the reconstructed 3D images by a series of image-processing methods, followed by a discussion of the experimental results.
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Issue Date: 05 June 2007
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