According to some tests, there is no obvious difference in output power between a lamp using 2h and a lamp using 5600h in an aging test system equipped with irradiance control. The irradiance control device can maintain a constant light intensity . In addition, their spectral energy distribution is also unchanged, which is very different from xenon arc lamps.
One of the main advantages of using a UV weathering test chamber is that it can simulate the destruction of materials in a more realistic outdoor humid environment. When the material is placed outdoors, according to statistics, it is frequently exposed to moisture for at least 12 hours a day. Because this damping effect is mostly in the form of condensation, a special condensation principle is used to simulate outdoor humidity in the accelerated artificial weathering test.
During such a condensation cycle, the water tank at the bottom of the test chamber is heated to generate steam. Hot steam keeps the environment of the test chamber at 100% relative humidity at high temperatures. When designing the test box, the test board should actually constitute the side wall of the test box. In this way, the back of the test panel is exposed to room air at room temperature. The cooling effect of the indoor air makes the temperature of the surface of the test panel lower than the steam temperature by a few degrees. The temperature difference of several degrees can make the water continuously drop to the tested surface during the condensation cycle. The condensate produced in this way is pure distilled water with stable properties. This kind of water can improve the reproducibility of the experimental results, eliminate the problem of water sediment pollution and simplify the installation and operation of the test equipment.
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