Single-camera real-time measurement system and method for measuring surface shape of trough-type solar paraboloid

Abstract

The invention provides a single-camera real-time measurement system and method for measuring the surface shape of a trough-type solar paraboloidal surface shape. According to the system and method, afour-reflector reflection imaging system is utilized; a single camera performs three-dimensional image acquisition; a three-dimensional digital image correlation technology is adopted to perform three-dimensional surface coordinate reconstruction on the surface shape of the paraboloid; and therefore, the measurement of the surface shape of the trough-type solar paraboloid is realized, the installation and debugging of the trough-type solar paraboloid can be guided, and the installation efficiency and solar energy collection efficiency of the trough-type solar paraboloid can be improved. The fixing distance and enlargement factor of the camera are calibrated before actual measurement is performed; during measurement, the camera is positioned by a laser range finder; and since calibration steps that are needed to be performed every time are removed during the actual measurement, and therefore, test efficiency is improved. The measurement system has the advantages of online and real-timemeasurement, high accuracy, non-contact measurement, calibration-free application, high efficiency, flexible operation and the like.

Description

technical field [0001] The invention relates to a single-camera real-time measurement system and method for a trough-type solar parabolic surface shape, which belongs to the fields of optical measurement experiment, engineering material, component deformation and three-dimensional reconstruction measurement. Background technique [0002] my country has become the world's largest solar thermal application market and the world's largest solar collector manufacturing center. Solar thermal power generation is a new field of application of solar thermal technology. It has come from behind in the solar thermal utilization industry, and its development momentum is very rapid. In the trough solar thermal power generation system, the accuracy of the positioning of the trough paraboloid has an important impact on the heat collection efficiency. When installing a solar parabolic mirror, due to factors such as manufacturing errors of the supporting device and human operation errors, th...

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Problems solved by technology

[0003] At present, many researchers have carried out relevant research on the surface shape of the paraboloid, mainly using reflective projection grid (based on the principle of deflection to quickly detect the surface shape of solar trough concentrators, 2013,12(40):1208006; Specular shape measurement of trough parabolic unit based on fringe reflectometry, 2013,1(33):0112007), principle of dual-camera 3D vision (Photogrammetry: A Powerful Tool for Geometric Analysis of Solar Concentrators and Their Components, Journal of Solar Energy Engineering, 2005 , 107:94-101), the trough mirror installation accuracy measurement system based on GPS positioning technology (patent number: CN102589433B) to measure the surface shape and position of the paraboloid, due to the complexity of the operation process and the vulnerability to the influence of the outdoor environment and the measurement accuracy Low, it is difficult to be applied in the actual process

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