Research On The Technology Of The Highly Collimated Solar Simulator With High Intensity

Solar Simulator is an important test or calibration equipment used to simulate thecharacteristics of the solar radiation under various conditions of air mass in the room.The development of solar simulation technology is closely related to the developmentof space science and technology in our country, as the precision of spacecraft attitudecontroller is increasingly high, requirements for solar simulators are becoming moresophisticated, and with the development of CPV solar cells, a solar simulation devicecalled highly collimated solar simulator, which can reflect the true sun32’ inclination,is demanded.In order to develop a highly collimated solar simulator with high intensity, thesolar simulation technology is studied in detail in this paper. Firstly, the solarsimulation optical system is studied, for the ellipsoidal condenser in this opticalsystem, its parameters and its concentrating characteristics are researched, and adeformed ellipsoid condenser is innovatively presented based on the theory above, forthe optical integrator in the optical system, the impact of the numbers and shapes ofthe elements to the surface irradiance uniformity is also studied, for the collimatinglens in the optical system, its structures are studied, and telephoto lens which can beused as solar simulator collimating lens are proposed in the paper, this lens have ashort back focal, and it is very suitable for the applications requiring a compact solarsimulation optical System. On the basis of the solar simulation optical system research,a highly collimated solar simulation optical system is designed, and the theory using small magnification ellipsoid condenser to the highly collimated solar simulationoptical system is innovatively proposed, the efficiency evaluation by achieving aninclusive angle to collect energy is no longer appropriate, instead the evaluation bytaking advantages of near-axis point energy is useful, and the theory that smallmagnification ellipsoidal condenser can significantly improve the radiation intensityof the highly collimated solar simulator is verified after comparing two simulationmodels. Secondly the solar simulator mechanical structure and system components arestudied combined with our solar simulator development; Again, the processing anddetection methods of ellipsoidal condenser are studied in this paper, finally, the solarsimulator technical indicator detection methods are studied as well.In this paper, the analysis methods including numerical analysis using MATLAB,optimization based on ZEMAX, and Monte Carlo ray tracing simulation analysisbased LIGHTTOOLS are used.The innovations in this paper are as follows:1. A deformed is proposed, it can improve the uniformity of the solar simulator,the deformed condenser is derived from the standard ellipsoid condenser, its surfaceshape can be controlled by three deformation coefficients, and it can increase thesurface irradiation uniformity of the solar simulator if the appropriate deformationcoefficients are selected.2. The telephoto lens used in solar simulators as collimation system is proposed,it can change the "long neck" of the solar simulator by using the inverted dualseparated lens, the length of the solar simulator is greatly becoming short by using atelephoto type lens, which is very suitable for the applications requiring for a compactsolar simulation device.3. The small magnification applied to the highly collimated solar simulationoptical system is proposed, the ellipsoid condenser with large collection angle is nolonger energy efficiency evaluation, while the evaluation by taking full advantages ofnear-axis luminous point is instead, the theory is verified by two comparingsimulation models created in LIGHTTOOLS software. The highly collimated solar simulator is an essential equipment applied to theprecision measurement of the sun sensor and the calibration of CPV cells, howeverbecause of the tiny collimation angles of the highly collimated solar simulator, theenergy emitting from the collimator aperture is very small, so it is very difficult toachieve high intensity for highly collimated solar simulators, the technology ofhighly collimated solar simulator with high intensity is of great significance.