FAST DETECTION METHOD FOR NORMAL ERROR OF PARABOLIC DISH CONCENTRATOR BASED ON DEFLECTOMETRY

Liu Fanmao; Zhang Yuanyuan; Liao Cancan; Mo Han

doi:10.19912/j.0254-0096.tynxb.2022-0831

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (8) : 367-378. DOI: 10.19912/j.0254-0096.tynxb.2022-0831

FAST DETECTION METHOD FOR NORMAL ERROR OF PARABOLIC DISH CONCENTRATOR BASED ON DEFLECTOMETRY

Liu Fanmao, Zhang Yuanyuan, Liao Cancan, Mo Han

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Abstract

To achieve fast detection for normal error of the parabolic mirror of the dish concentrator, for the lack of depth information in the monocular deflectometry method, an iterative fitting algorithm is proposed to correct the conversion error between the mirror coordinate system and the camera coordinate system by fitting the calculated quadratic surface coefficients to realize the fast positioning and normal error calculation of the parabolic mirror of the symmetric dish concentrator. The experimental platform is built and five parabolic mirror measurement experiments with different positions and orientations are conducted to obtain the actual normal direction data of the measured parabolic mirror. Compared with the standard normal direction of the design surface of parabolic mirror, the average error is 7.3591 mrad. Furthermore, the normal error measured in the five measurements is similar, and its overall standard deviation is 5.0278 mrad; The normal error measured by this method is verified to be less than 20 mrad through compared with the reference data of parabolic mirror surface shape. Finally, the experimental results show that the method is feasible, fast and stable.

Key words

solar thermal power generation / concentrators / dish / error detection / phase shift / deflectometry

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Liu Fanmao, Zhang Yuanyuan, Liao Cancan, Mo Han. FAST DETECTION METHOD FOR NORMAL ERROR OF PARABOLIC DISH CONCENTRATOR BASED ON DEFLECTOMETRY[J]. Acta Energiae Solaris Sinica. 2023, 44(8): 367-378 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0831

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