Xenon lamp aging test chambers use sensors that control irradiance at 340nm or 420nm, further reducing the amount of spectral change in specific areas of the Xenon lamp aging chamber. Flat panel and rotary drum chambers have equal feedback loop irradiance control systems. It is recommended that periodic lamp replacement will reduce the effects of lamp aging.
In theory, the light intensity can be monitored anywhere in the xenon lamp spectrum, but only a few bands are used. Irradiance control is generally performed in the region of the spectrum where the material is zui sensitive (e.g., where degradation is expected to occur). In addition, irradiance control points change depending on the industry and application.
340nm control point is widely used in xenon lamp aging test, for outdoor durability products aging test old say, short-wave UV region dangerous. 340nm control requires a UV sensor equipped with a filter, xenon arc lamp aging tester it only allows a narrow band centered on 340nm to pass. Usually, this is the ideal control point for coatings, plastics, roofing materials, etc. Xenon arc lamp aging tester zui common irradiance control point is 0.35 or 0.55W/㎡/nm@340nm.
The 420nm control point is generally used with window glass filters for indoor light stability testing of materials. Control of 420nm requires the UV sensor to be equipped with a filter that allows only a narrow band of UV light centered at 420nm to pass. The system tests, typically, these materials that are primarily damaged by long-wave UV and visible light. Examples include fuels and pigments in knitwear, paper and ink. The zui common irradiance set point simulated in the Xenon arc lamp aging chamber is 1.10W/㎡/nm@420nm.
Flat panel and rotary drum chambers are typically equipped with 340nm or 420nm narrow band irradiance control systems. Xenon arc lamp aging testers are available in different models. Some European test chambers can use a broadband TUV (full UV, 300-400nm) or a very broadband full irradiance sensor (280-800nm). Broadband sensors do not respond to relatively small changes in UV light, and this non-sensitivity can pose problems for critical degradation mechanisms driven by the short-wave UV portion of the spectrum.
In summary, flat panel and rotating drum test chambers come with, equal amounts of feedback loop irradiance control systems. It is recommended that periodic lamp replacement will reduce the effects of lamp aging. By using sensors that control irradiance at 340nm or 420nm, the amount of spectral change in specific areas of the Xenon lamp aging test chamber will be further reduced.