Design method of free-form surface reflector for solar direct radiation measurement

Abstract

The invention discloses a design method of a free-form surface reflector for solar direct radiation measurement. Belongs to the technical field of non-imaging optics. The specific light path structure of the free-form surface reflector is set according to the measurement angle requirement, and the free-form surface reflector meeting the preset measurement requirement is designed according to the reflection law and the global solar direct radiation angle change rule. Global direct solar radiation light is reflected by the free-form surface reflector and then is received at the center of the sensor, direct solar radiation data is obtained, and direct solar radiation measurement is completed. The free-form surface is obtained through surface finite element division. The device is compact and simple in structure; and theoretical basis and technical support are provided for new products and new applications in the field of subsequent solar radiation measurement.

Description

technical field [0001] The invention relates to the technical field of non-imaging optics, in particular to a design method of a free-form surface reflector for direct solar radiation measurement Background technique [0002] Solar radiation is the most important source of energy for the earth, and its changes affect the climate and environment of the earth. Solar radiation is mainly divided into two types: direct radiation and diffuse radiation. Direct radiation is closely related to the state of the sun itself. The measurement of its spectral irradiance and total irradiance is helpful for long-term monitoring of solar activity changes, inversion of cloud cover and atmospheric The optical properties of aerosols are of great significance to the development of solar energy resources, monitoring of atmospheric environment and pollution, climate change, early warning of extreme weather disasters, and guarantee of agricultural production. [0003] At present, the instruments fo...

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Problems solved by technology

Based on this method, Jiangsu Institute of Radio Science also designed a WUSH-RZ2 sunlight sensor that uses a multi-divided sky-dome shading scheme. This type of method has a principle error that is difficult to correct.

The SD series sunshine sensor of Germany Logotronic Company and the TBS series pyrheliometer of Jinzhou Sunshine Meteorological Technology Co., Ltd. are based on the direct radiation measurement method, and use the two-dimensional tracking mechanism to realize the measurement of the total irradiance of direct solar radiation. The tracking accuracy is affected by the algorithm and weather Influence, small tracking range

The MS series sunshine hours measurement system developed by Japan EKO Company uses frosted reflectors to realize the sunshine hours measurement without automatic sun tracking device in the range of ±58° earth latitude. Because the reflectors are frosted, it is difficult to control the whole The uniformity of the annual direct solar radiation measurement and the consistency of the instrument are difficult to guarantee

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