UV light-emitting diodes as a radiation source in a device for the artificial weathering of samples

A light-emitting diode, artificial climate technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve problems such as inability to adjust optimal conditions, inflexibility, long exposure time, etc.

Active Publication Date: 2007-08-08
阿特莱斯材料检测技术有限公司
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  • Abstract
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Problems solved by technology

However, due to the relatively low magnitude of the spectral exposure on the specimen itself, relatively long exposure times are required
[0007] Another disadvantage of the aforementioned radiation sources commonly used in weathering detectors is that, due to the way they are designed and operated, they are relatively inflexible, e.g. the inability to adjust optimal conditions to the sample surface of the sample of material to be exposed

Method used

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  • UV light-emitting diodes as a radiation source in a device for the artificial weathering of samples
  • UV light-emitting diodes as a radiation source in a device for the artificial weathering of samples

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Embodiment Construction

[0028] Fig. 1 is a longitudinal section showing an artificial weathering sample device according to the present invention.

[0029] A support frame 2 closed in a ring shape is assembled to be rotatable in the weathering chamber 1, and a sample 3 or a workpiece can be supported on its inner wall. The support frame 2 has a particularly circular cross section. By fixing the tubular support 4 to the top wall of the weathering chamber 1, the tubular support 4 is positioned within the support frame 2 and is concentric with it. A flexible printed circuit board 5 is wrapped around the outer periphery of the tubular support 4 and fixed thereto in a suitable manner. The UV light emitting diodes 6 are mounted on the flexible printed circuit board 5 in a regular arrangement by using surface mount technology. The UV light emitting diodes 6 may comprise different types of light emitting diodes with different radiation spectral characteristics. In addition they can be electrically operate...

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Abstract

The usual xenon radiation source in conventional weathering testers is replaced by UV light-emitting diodes (LEDs) ( 6 ). These can be used to provide a good approximation of the UV component of the solar spectrum, in particular when different types of UV light-emitting diodes ( 6 ) with different emission characteristics are employed. Optionally, further light-emitting diodes in the visible spectral range may also be used in order to cover other parts of the solar spectrum. The light-emitting diodes ( 6 ) may be mounted on a flexible printed circuit board ( 5 ), which may in turn be fitted on a tubular holding body ( 4 ). The flexible printed circuit board carrying the light-emitting diodes may also be placed on other substrates ( 7 ) which are pliable in a geometrically stable way, so that that they can be arranged at a uniform distance from material samples with a particular surface topology, in order to obtain uniform exposure.

Description

technical field [0001] The invention relates to a device for artificially weathering samples. In this device, the weather-dependent aging of test samples, in particular test samples of flat material, is evaluated by artificially weathering the test samples. For this purpose, such devices generally have a weathering chamber containing a support for the sample to be aged; and a radiation source for applying radiation, especially UV radiation, to the sample. Background technique [0002] This device for artificially weathered specimens is used to assess the lifetime of materials that are subjected to climatic influences such as sunlight, solar heat, humidity, etc. due to their constant exposure to natural weathering environments during use. In order to obtain a good simulation of natural weathering conditions, the spectral energy distribution of the light generated in the installation should be as close as possible to that in natural solar radiation, for which purpose xenon ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
CPCG01N17/004
Inventor 彼得·马奇伯尔德·鲁道夫
Owner 阿特莱斯材料检测技术有限公司
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