Abstract:

Abstract:Since traditional solar simulators are mainly applied to spacecraft and photovoltaic industry, they are not suitable for solar radiation measuring instrument test. Therefore, a deep research is carried out on solar simulators to test of solar radiation measuring instrument, so that obtain the requirements of performance test of solar radiation measuring instrument. With a combination of the requirements for national regulations of metrological verification and performance test of pyranometer and pyrheliometer, it lays emphasis on the research of design methods for improving radiation uniformity and stability of solar simulators; it also focuses on design methods of multidimensional detection workbench, which achieves different detection of solar radiation. After practical test, solar irradiation is within Φ60mm; irradiation non-uniformity is better than ±0.8%; instability is better than ±0.72%; rotating angle precision is better than 0.09°. Then, solar simulator is used to carry out pyranometer sensitivity test, pyranometer directional response test, pyranometer tilt response test and non-linearity test for radiation instruments. Test results show that the solar simulator meets the testing requirements of solar radiation measuring instruments.

Abstract:Directional response is one of the most important parameters of pyranometer, which is crucial to evaluate the performance of the pyranometer by determining the responsivity and the corresponding radiation for solar beam radiation from different directions of the pyranometer. In the paper, the method for testing directional error is present, four pyranometers are tested, after data processing, the directional errors of a secondary standard CMP22 and a first class CMP11 are 4.5 W/m2 and 8.3 W/m2 respectively, which are within the nominal specification given by the manufacturer. Meanwhile, the directional error of a first class pyranometer FS-S6 is 11.0 W/m2, while the value of a second class pyranometer TBQ-2-B is 15.2 W/m2, which both meet the specification for classification. The results show that these four pyranometers can reach the levels recommended by WMO and ISO, which validates that the method is feasible and the China made pyranometers are reliable.

Abstract:The use of data of National Radiometric Standard took place in the WMO International Pyrheliometer Comparisons IPC-XI to evaluate the expended uncertainty of the comparison result between National Radiometric Standards(NRS)and the World Radiometric Reference(WRR)in Davos/World Radiometric Center. The result of expended uncertainty is 0.17%, which meets the requirements of the World Meteorological Organization (WMO) and has reached the world advanced level. In this paper, the method can be used as a reference and basis for evaluating the uncertainty of the comparison results of the Provincial solar radiation standard.

Abstract:A new generation of solar spectroradiometerhas been developed by CUST/JRSI to improve solarirradiance observation data underhyperspectral resolution. It is based on the grating spectroradiometer with a back-thinned CCD linear image sensor and is operated in a hermetically sealed enclosure. The solar spectroradiometer is designed to measure the solar spectral irradiance from 300nm to 1100nm wavelength range with the spectral resolution of 2nm (the full width at half maximum). The optical bench is optimized to minimize stray light. The Peltier device is used to stabilize the temperature of CCD sensor to 25℃, while the change of temperature of CCD sensor is controlled to ±1℃ by the dedicated Peltierdriver and control circuit.

Abstract:This paper mainly discusses the development status of solar radiation measurement technology, it expounds the relevant content of the current world radiation measurement datum and its standardization. Article the direct radiation from the sun, the main measuring principle of total radiation and scattering radiation, this paper discusses the different types of radiation survey measuring elements, measuring range, emphasis and the current widespread use of measurement instruments. The development trend of future solar radiation measurement is put forward, and it is emphasized that nanotechnology and spectrum technology will become the focus of solar radiation instrument research and development.

Abstract:The ISO9845-1-1992(E) standard has been issued for more than 20 years, the various factors that affect the solar spectral radiation have been undergone many changes over the years. The standard data cannot satisfy the current needs. According to the opinions of international experts on the revision of ISO9845-1-1992(E): in the revised standard, the spectral irradiation of different inclined surface should be added, Accordingly, China land center and European land average latitude should be calculated. In this paper, the geometric average latitude and weighted average latitude of China land are calculated respectively. The direct normal irradiance and hemispherical irradiance are calculated by using SMART model at the two tilt angle that corresponding to the latitudes.

Abstract:Beginning with the analysis on the principle of photoelectric sunshine duration sensor and combining with the problems occurred in use, various factors affecting the accuracy of observation are discussed. The digital sunshine duration sensor solutions are put forward by analysis on the data detection and observation, the corrections on the error factors are discussed, such as directional response characteristic, stray light and temperature characteristic. As a consequence, the precision of the sunshine duration with automatic observation is improved.