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Photo Emission Tech., Inc., manufactures and markets cell testers and solar simulation systems that are also known as sun simulator that provide full spectrum light equivalent to the sunlight. The primary applications of these solar simulators are checking Photovoltaic Cell performance, materials testing, photo-lithography, cosmetic testing and in any other application where the effect of exposure to sun light needs to be studied, such as photochemistry/photobiology testing and environmental exposure testing. Seven standard solar simulators models are available for each class that serves these markets. Solar simulator systems can be manufactured with three different air mass (AM) filters: AM0, AM1 and AM1.5. These solar simulators meet Class A requirements of ASTM E927-2010, IEC60904-9 Edition 2.0 2007-10 and JIS C 8912-1998: amendment 1-2005 & Amendment 2-2011.
The ground level spectrum of natural sunlight is different for various locations on earth. The constituents of the atmosphere affect both absorption and scattering. Elevation is another factor that affects the ground level spectrum, since the elevation determines how far the sun's radiation must pass through the atmosphere. For any given location the distance the sun's radiation must travel through the atmosphere changes as the day progresses, due to the changing angle of the sun. With the sun directly overhead the direct radiation that passes through travels the shortest distance through earth's atmosphere to reach the earth. The spectrum of this radiation is referred to as "Air Mass 1 Direct" (AM1D). For standardization purposes sea level is used as a standard reference site. The global radiation with the sun overhead is referred to as "Air Mass 1 Global" (AM1G). The spectrum of sun's radiation in space does not pass through any air mass hence it is referred to as "Air Mass 0" (AM0).
EnquiryPET Solar Simulators consist of a Light Source with a built-in Lamp Power Supply. The Solar Simulator has an ellipsoidal reflector that surrounds the lamp and collects most of the lamp output. The radiation from the lamp is focused onto an optical integrator that helps produce a uniform diverging beam. The beam is diverted 90° by a mirror onto a collimating lens. Special filters are placed between the mirror and the collimating lens to shape the radiation spectra to match various air masses. The output is a uniform beam that closely matches the sun's radiation spectra for a given air mass. Various models offer different areas of illumination. Each model can be manufactured to simulate the sun's radiation for different air masses.
The power supply unit provides constant electrical power to the xenon arc lamp. All of our systems come with a standard closed loop light intensity controller. This helps in assuring very stable light intensity. In addition the power supply unit houses control circuitry for several control features. Some of the control features are discussed here.
In order to classify a Solar Simulator as a “Class A” system, it must meet all three requirements specified under Class A, i.e. the non-uniformity of the irradiance over the area of illumination must be ≤2%, and the Short Term Temporal Instability of irradiance must be ≤0.5% and the Long Term Temporal Instability (LTI) of irradiance must be ≤2%, and the spectral match in each wavelength interval must be ±25% or better. In addition, the total intensity must be 1,000W/m2 (100mW/cm2) for AM1.5G.
A report similar to the typical final test report shown below is delivered with each Cell Tester or Solar Simulator to certify that the Cell Tester or the Solar Simulator meets or exceeds all the criteria of the Class AAA requirements of ASTM E927-2010, IEC60904-9 Edition 2.0:2007-10 and JIS C 8912-1998: amendment 1-2005 & Amendment 2-2011AAA system. Pages 1 through 5 of Typical Final test report are included in the Final Test Report for each Solar Simulator shipped. Page 6 of the Typical final test Report is included in the Final Test Report for Solar Simulators with Touch Panel Controls and page 7 of the Typical Final Test report is included in the Final Test Report for each Cell Tester.