Device to simulate a UV spectral characteristic using UV-LEDs
A technology of light-emitting diodes and spectral characteristics, which is applied in the field of ultraviolet irradiation devices, can solve problems such as short service life, inability to adjust, and non-adjustability, and achieve the effect of reducing spatial inhomogeneity
Active Publication Date: 2014-01-22
ATLAS MATERIAL TESTING TECH L L C
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Problems solved by technology
As we all know, although the use of xenon lamps cannot simulate the solar spectrum well, the emitted radiation contains a relatively high spectral proportion in the infrared spectrum range. In order to prevent the sample from heating up too much, a filter must be used to filter the above infrared spectrum.
In addition, the service life of xenon radiation sources commonly used in the market is only about 1500 hours
[0006] Also metal halide lamps can be used as radiation sources, but have the disadvantage that they are not adjustable or very difficult to adjust
Similar characteristics are fluorescent lamps, which are also widely used as radiation sources in weathering inspection equipment, but have the disadvantage of a shorter service life
[0007] In addition, all mentioned sources of radiation have the disadvantage that their spectrum cannot be changed
[0008] Another disadvantage of the conventional radiation source of the weathering inspection equipment mentioned above is that its structure and control method are relatively inflexible, and cannot be adjusted according to the different conditions of the surface of the material sample to be irradiated.
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[0032] The present invention will be further described below according to the embodiments and the accompanying drawings.
[0033] attached Figure 1AThe basic principle of the invention is shown by means of wavelength intensity diagrams. The short-wave rising edge of the ultraviolet part of the solar spectrum is shown here only as a solid line. For example, in a weathering or lightfastness test an attempt is made to simulate this trend by means of three UV LEDs with different radiation spectra. The spectra of three of the UV LEDs are shown as dashed lines, while the overlapping radiation spectra are shown as dotted lines. It can also be seen from this graph that the radiation spectrum has different radiation intensities, so the light-emitting diodes to which the radiation spectrum belongs should also have different total radiation intensities. This can be achieved basically in two ways: by including different numbers of LEDs in the different classes, i.e. the largest number ...
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The present invention provides a device to simulate a UV spectral characteristic using UV-LEDs. The device has a weathering chamber (1) in which a UV-radiation device (2, 20, 30) is arranged and in a spaced sample plane at least one sample (3) is disposed, wherein the UV-radiation device (2, 20; 30) comprises a plurality of UV light emitting diodes (UV-LEDs) (2.1, 21, 31.n) comprising two or more classes of UV LEDs (2.1, 21, 31.n) of different emission bands, wherein the emission bands are selected such that, in a spectrum of the sample plane is achieved, with which a certain spectral characteristic UV is approximated.
Description
technical field [0001] The invention relates to a device for carrying out artificial weathering or lightfastness tests of samples, a UV irradiation device and a method of operating such a device. Background technique [0002] The weathering state of test specimens, in particular planar material specimens, is evaluated in an artificial weathering device in which the test specimens are artificially weathered. For this purpose, the above-mentioned devices usually comprise a weathering chamber in which a holding device for holding the sample to be weathered and a radiation source for irradiating the sample, in particular ultraviolet radiation, are arranged. [0003] In most such installations where artificial weathering or lightfastness tests are carried out on samples of materials which are continuously exposed to natural weather conditions during use and whose condition gradually deteriorates under the influence of the climate Variation, the above-mentioned climate influences...
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IPC IPC(8): G01N17/00
CPCG01N1/44G01N17/004
Inventor 贝恩德·鲁道夫姆克尔季奇·胡达韦尔季彼得·马尔希
Owner ATLAS MATERIAL TESTING TECH L L C