Ultraviolet light exposure aging test uses fluorescent ultraviolet light to simulate the destructive effect of sunlight on durable materials. This is different from the above-mentioned xenon arc lamp. The fluorescent ultraviolet lamp is similar in electrical principle to the ordinary illumination cold fluorescent lamp, but can generate more ultraviolet light than visible light or infrared light.
For different exposure applications, there are different types of lamps with different spectra to choose from. The UVA-340 lamp is a good model for simulating sunlight in the main short-wavelength UV spectrum. The spectral energy distribution (SPD) of the UVA-340 lamp is similar to the spectrum extracted from 360 nm in the solar spectrum. The UV-B type lamp is also a commonly used accelerated artificial weathering test lamp. It destroys materials faster than UV-A lamps, but its shorter wavelength energy output than 360 nm can deviate from actual test results for many materials.
Irradiance (light intensity) control is necessary to obtain accurate and reproducible results. Most UV aging test devices are equipped with an irradiance control system. These precise irradiance control systems allow the user to select an irradiance metric when testing. Through the feedback control system, the irradiance can be continuously and automatically monitored and accurately controlled. The control system automatically compensates for insufficient illumination due to aging of the lamp or other causes by adjusting the power of the lamp.
Fluorescent UV lamps simplify irradiance control due to their inherent spectral stability. All sources of light will age over time. But fluorescent lamps, unlike other types of lamps, do not change their spectral energy distribution over time. This feature enhances the reproducibility of the test results and is therefore a major advantage.
Tests have shown that the use of a 2h lamp and a 5600h lamp have no significant difference in output power in an irradiance controlled aging test system. The irradiance control device maintains a constant light intensity. In addition, their spectral energy distribution does not change, which is very different from xenon arc lamps.
One of the main advantages of using the violet lamp aging test is that it can simulate the damage to the material in a more realistic outdoor humid environment. When the material is placed outdoors, it is estimated that it is frequently subjected to moisture for at least 12 hours per day. Because this moisturization is mostly manifested in the form of condensation, a special condensation principle is used in the accelerated artificial weathering test to mimic outdoor humidity.
Beijing Hongda Tianmao Testing Equipment Co., Ltd. Tel:
fax:
For more product information, please visit:
.cn
Dongguan Anmeixuan Electronic Technology Co., Ltd , https://www.hyashine.com