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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

SIMULTANEOUS RECONSTRUCTION OF OPTICAL AND THERMAL PROPERTIES IN HETEROGENEOUS ABSORBING MEDIA BY USING THE LIGHT FIELD IMAGING TECHNIQUE

Xing Huang
School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 15001, China

Hong Qi
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

Chunyang Niu
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

Li-Ming Ruan
School of Energy Science and Engineering, Harbin Institute of Technology 92 West Dazhi Street, Harbin, Heilongjiang, 150001, P.R. China

Heping Tan
School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin, 150001, P. R. China

Jun Sun
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China

Chuanlong Xu
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China

Abstract

Measurement of optical and thermal properties (temperature field and radiative properties) of luminous flame plays an important role in many engineering fields. To find a solution to simultaneous reconstruction of optical and thermal properties of the heterogeneous absorbing media, an inverse method based on multispectral light field imaging technique is developed. In this method, the light field imaging technique is introduced as a measuring technique, and the outgoing radiation intensities at the boundary surfaces of media are obtained by light field imaging system, served as input for the inverse problem. The Line-of-Sight (LOS) method is employed as the computing method of the forward problem, and a hybrid truncated singular value decomposition-conjugate gradient (TSVD-CG) algorithm is proposed to simultaneously reconstruct 3D temperature distribution and absorption coefficient field of the participating media. A non-contact measurement experimental platform of flame optical and thermal properties based on light field imaging is introduced to investigate the validity of the proposed method, and the ethylene diffusion flame is chosen as the subject. All the experimental results show that the reconstructed temperature distribution and absorption coefficient field are reasonable, which also proves that the proposed method is feasible. In summary, the simultaneous reconstruction method based on the multispectral light field imaging technique is suitable for the reconstruction of optical and thermal properties of heterogeneous absorbing media.

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