Whether it is an air-cooled xenon weatherproof test chamber or a water-cooled xenon lamp weatherproof test chamber, the output of the xenon lamp will decay over time. The advanced xenon lamp weatherproof test chamber compensates for this using a feedback loop control system. With this system, the operator can preset the irradiance level while the irradiance sensor in the test chamber measures the light. When the lamp ages and the output is attenuated, the system automatically compensates by increasing the power of the xenon lamp.
In theory, the light intensity can be monitored anywhere in the xenon spectrum, but only a few bands are usually used. Irradiance control is generally performed in the spectral region where the material is most sensitive. In addition, the irradiance control points are also changed by industry and application.
The 340nm control point is widely used in accelerated aging tests. For outdoor aging products, the short-wave UV region is the most dangerous. The 340nm control requires an ultraviolet sensor equipped with a filter that allows only a narrow band centered at 340nm. Typically, this is an ideal control point for coatings, plastics, roofing materials, and the like. The most common irradiance control point is 0.35 or 0.55 W/m2/nm@340 nm.
The 420nm control point is typically used with window glass filters for indoor light stability testing of materials. For 420nm control, the UV sensor is required to be equipped with a filter that allows only a narrow band of ultraviolet light centered at 420 nm. The objects tested by the system are usually those materials that are mainly damaged by long-wave ultraviolet light and visible light; the most common irradiance setting point for indoor simulation is 1.10 W/m2/nm@420 nm.
Air-cooled and water-cooled xenon weather test chambers are usually equipped with a 340 nm or 420 nm narrow-band irradiance control system. According to different models. Some European test chambers can use a broadband TUV (complete UV, 300-400 nm), or a very broadband full irradiance sensor (280-800 nm). Broadband sensors do not respond to relatively small changes in UV light, a non-sensitivity that can cause problems with critical degradation mechanisms driven by the short-wavelength UV portion of the spectrum.
Air-cooled and water-cooled xenon weather-resistant test chambers with efficient, equal-feedback feedback loop irradiance control systems. It is recommended that regular replacement of the lamp will reduce the effects of lamp aging. By using a sensor that controls the irradiance at 340 nm or 420 nm, the amount of spectral change in a specific region is further reduced.
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