Preliminary Study On Light Source Of High Irradiance Solar Simulator

Solar simulator is the equipment which can simulate indoors natural sunlight. It has stable irradiance and is not affected by time,seasons,climate, so that solar simulator has been used for testing and researching in energy,chemical industry,electronic device,biomedical engineering and so on.Up now,low irradiance solar simulators have been in commodity production,and its national and international standards have been drawn up.The application of condensation solar energy,such as CPV cells,solar stove,and etc,bring forward the request of high irradiance solar simulator.This paper give the primary researchments on high irradiance solar simulator.The most critical choice of the solar simulator is the light source. Its spectrum should be close to the solar spectrum as possible,as well as it should be of high luminous efficiency,power adjustable,high brightness and etc. Short-arc xenon lamp radiation energy distribution approximates to the grey body radiation distribution, its light color closes to the sunlight, thus it is most used as light source of solar simulator.Researching on its spectral characteristic of xenon lamp,especially spatial distribution, which is dependent on the internal temperature distribution and the relationship between those and current density would help us to understand optical principle of xenon lamp and provide reliable reference to improve structure of xenon lamp,so as to design optical system of the high irradiance solar simulators.In this paper, axially spectral distribution of xenon lamp is measured,additionally evaluate spectral mismatching error according to distribution of standard spectrum radiation intensity. Bartels method is utilized for calculating temperature distribution by using self-reversed lines in near-infrared spectrum, and the temperature distribution dependent on current density is analysised.Based on the characteristics of the short-arc xenon, a novel magnetically dispersed arc plasma generator used as light source of solar simulator is designed in this paper. Experiments are carried under ambient argon gas. The characteristics of arc current and voltage,arc plasma dispersed process and radially spectral distribution are analysised by electrical parameter measurement,emission spectroscopy and CCD photography. Experimental observations shows that: magnetic field can effectively forces arc to high-speed rotate and the arc is fully dispersed ultimately. CCD images show that irradiance unevenness and instability are respectively 36.3% and 27% for fully dispersed arc,compared with 73.7% and 69.8% for the undispersed arc. Arc voltage ripple frequency increases, pulse amplitude significantly reduces, arc voltage almost keep constant,which indicate that increasing magnetic field strength leads to improve stability of dispersed arc plasma light source. Spectral distributions of radial plane confirm that radial intensity tends to be homogeneity. In addition,irradiation uniformity of the light source is analysed by Tracepro,it shows that the minimum irradiance nonuniformity reaches 15.4%。...