MHG Solar Simulation

Atlas – The performance benchmark for solar simulators using metal halide global technology (MHG)

  • Overview +

    Filtered MHG lighting is a mature technology used since the 80’s for larger solar simulators inside environmental test chambers. MHG lamps are filled with a mixture of mercury, halides and rare earth elements which vaporize during ignition, generating a plasma. After a few minutes, the plasma reaches thermal equilibrium and emits a quasi-continuous spectrum (when properly filtered) similar to global solar radiation.

    Currently, although optically filtered xenon lamps provide the best spectral match to natural solar radiation in the UV and visible portions of the spectrum, MHG technology exhibits two advantages over xenon. First, MHG are high efficiency sources and provide a higher output for electrical input and are better suited to large area illumination. Second, MHG emits lower amounts of infrared as compared to xenon, making thermal management easier. As with xenon, optical filters fine-tune the spectral irradiance to provide solar radiation outdoor or glass-filtered indoor solar radiation.

    The technology, however, also exhibits some disadvantages. The spectral power distribution, for example, is directly dependent on plasma temperature. Changes in plasma temperature due to cooling/warming of luminaires, or changes to operating power (dimming) can have an immediate effect on the spectrum. Therefore, they are operated within a narrow power band; irradiance is determined by the distance.

    The SolarConstant MHG series offers several luminaires based on MHG technology for high-end solar simulators. Special reflector designs guarantee the irradiance uniformity needed on your test object. For each new custom design, Atlas will run computer simulations with our proprietary modeling software to determine both the minimum number of SolarConstants required as well as their ideal positioning inside the chamber.

    An Atlas team of professionals finally integrates the solar simulator into the environmental test chamber - either static or positionable/moveable in all spatial directions, depending on design.

  • SolarConstant MHG 4000/2500 +

    The Atlas SolarConstant MHG 4000/2500 is the flagship of the SolarConstant product line. Special reflectors guarantee highly uniform irradiance patterns of multi-luminaire SolarConstant systems. Compared to halogen or infrared systems, they are the best solution to accurately determine the solar thermal load effects on components or full products, such as fit and finish, dimensional stability or thermal transmission. Further, they make Class B solar simulators useful for PV module light soaking testing and others.
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  • SolarConstant MHG 1500/1200 +

    The Atlas SolarConstant MHG 1500/1200 are the smaller luminaire, useful for small solar environmental test chambers with minimal distances to the test object. They can also be used in combination with the SolarConstant MHG 4000/2500 in array systems to fine-tune the coverage, especially over complex 3D test objects such as vehicles and military products.
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  • SolarConstant MIL +

    The Atlas SolarConstant MIL is a special luminaire designed for diurnal solar cycling testing where different lamps are needed to step the irradiance levels. Applications range from solar heat load testing to plant growth research.

    The operation of SolarConstant solar simulator systems is handled by a dedicated operator interface. Atlas provides tailored menu-driven software for the programming of each solar simulation system. Any solar profile, such as targeting a specific test object geometry (Limousine / SUV / Van), or a daytime (Morning / Noon / Afternoon) diurnal solar transit, can be stored and combined to create test sequences for a complete test program.
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  • Solartest 1200 +

    Atlas SolarTest 1200 is a small benchtop solar simulator designed for irradiating small specimens. Very popular in the PV-industry; for example, research studies of PV solar cells.
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