Fluorescent Solar Spectrum Source for Low-Heat Weathering Tests
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Solution Overview
Problem
Existing artificial weathering devices using xenon, halogen, and fluorescent lamps as radiation sources face limitations such as high infrared spectral components, non-adjustability, short lifetimes, and inadequate simulation of the solar spectrum, necessitating improved radiation sources for accurate material aging prediction.
Innovation Solution
Employing UV light-emitting diodes (UV-LEDs) in conjunction with a fluorescent material that emits radiation with spectral characteristics similar to natural solar radiation, allowing for adjustable and prolonged simulation of solar conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a xenon lamp is used as the radiation source, then the solar spectrum is simulated very well, but the infrared spectral component is relatively high causing excessive heating of samples
Solution Approach 1:
The patent extracts and removes the harmful infrared spectral component from the radiation source while retaining the useful UV and visible components. This is achieved by using a xenon lamp with selective infrared filtering or by employing LED-based sources that inherently emit minimal infrared radiation, thus simulating the solar spectrum accurately without causing excessive sample heating.
Solution Approach 2:
The patent applies local quality by creating non-uniform spectral distribution where different wavelength regions are controlled independently. The radiation source is designed to provide high intensity in the UV region (300-400nm) for accelerated aging while suppressing the infrared region (>700nm) to prevent heating, achieving localized spectral optimization rather than uniform radiation across all wavelengths.
2Measurement precision
If a xenon lamp is used as the radiation source, then the solar spectrum is simulated well, but the lifetime is relatively short at about 1500 hours
Solution Approach 1:
The patent replaces the expensive but short-lived xenon lamp with LED-based radiation sources that have significantly longer operational lifetimes (tens of thousands of hours). While LEDs require multiple chips to match the spectral output of a single xenon lamp, the overall system achieves extended service life and reduced maintenance costs, making the radiation source economically sustainable for long-term accelerated aging tests.
3Device complexity
If halogen or fluorescent lamps are used as radiation sources, then the device complexity is reduced, but the spectral adjustability is limited or non-adjustable
Solution Approach 1:
The patent implements universality by designing a modular radiation source system using LED arrays where different wavelength LEDs (UV, blue, green, red) can be selectively activated. This allows a single apparatus to simulate various solar spectrum conditions (full spectrum, UV-only, customized spectral distributions) and accommodate different testing standards (ASTM, ISO, SAE), providing multi-functionality without requiring multiple separate radiation sources.
4Temperature
If UV LEDs are used to provide UV component approximation, then the infrared component is reduced, but the complete solar spectrum simulation requires additional components
Solution Approach 1:
The patent merges multiple LED types (UV LEDs for 300-400nm, blue LEDs for 400-500nm, green LEDs for 500-600nm, and red LEDs for 600-780nm) into a single integrated radiation source assembly. This combination of different LED chips on common heat sinks and control circuitry creates a unified multi-wavelength source that replaces what would traditionally require separate xenon or halogen lamps with filtering systems, reducing overall system complexity despite the increased number of LED components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides an accurate and prolonged simulation of solar radiation, enhancing the prediction of material aging by simulating the solar spectrum effectively and reducing excessive heating, thus improving the reliability of artificial weathering tests.
Implementation Method 1
UV light-emitting diodes (UV-LEDs) provided in the weathering chamber and a fluorescent material arranged to be radiated by a UV radiation emitted by the UV light source
Implementation Method 2
fluorescent material arranged to be radiated by a UV radiation emitted by the UV light source. The fluorescent material is configured to emit a fluorescent radiation
Implementation Method 3
fluorescent material arranged to be radiated by a UV radiation emitted by the UV light source. The fluorescent material is configured to emit a fluorescent radiation comprising spectral emission characteristics
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
An apparatus (10) for artificial weathering or lightfastness testing of samples (3) or for simulating solar radiation, the apparatus (10) comprising a weathering chamber (1), a UV light source (4) provided in the weathering chamber (1), and a fluorescent material (5) arranged to be radiated by a UV radiation emitted by the UV light source (4), the fluorescent material (5) being configured to emit a fluorescent radiation comprising spectral emission characteristics similar to natural solar radiation.