ASTM E490 Solar Constant Irradiance Simulation Testing
The ASTM E490 standard is pivotal in ensuring that materials and components intended for use in aerospace and aviation applications can withstand the extreme environmental conditions encountered at high altitudes and within space. The solar constant irradiance simulation testing under this standard replicates the sun's energy output as it reaches Earth’s upper atmosphere, providing critical data on material performance.
This testing is essential for ensuring that components such as satellite panels, aircraft skins, and other exposed structures do not degrade or fail due to excessive radiation. The high-altitude environment can expose materials to ultraviolet (UV) and infrared (IR) radiation in concentrations far exceeding those found at sea level. This simulation ensures that the materials perform reliably under these conditions.
The ASTM E490 test involves exposing specimens to a controlled source of solar irradiance, typically using an integrating sphere or similar apparatus. The test conditions are carefully calibrated to mimic real-world solar exposure. Specimen preparation is critical; it includes cleaning and conditioning the materials to remove any surface contaminants that could affect the results.
The instrumentation used in this testing must be precise and capable of delivering a consistent, stable irradiance level over extended periods. The test apparatus should also allow for accurate measurement of temperature, spectral distribution, and intensity of the irradiance. The acceptance criteria are stringent; they ensure that any material or component passing these tests will perform reliably under high-altitude conditions.
The results from ASTM E490 testing provide valuable data on how well materials can resist degradation due to solar radiation. This information is crucial for R&D engineers and quality managers in the aerospace sector, as it helps them make informed decisions about material selection and design improvements.
For compliance officers, this test ensures that products meet regulatory requirements, which is essential for certification and market entry. The data from ASTM E490 testing can also be used to support procurement decisions, ensuring that the highest quality materials are selected for critical aerospace applications.
Applied Standards
| Standard | Description |
|---|---|
| ASTM E490-18 | This standard specifies the methods for simulating solar constant irradiance at an altitude of 50 km using a xenon-arc lamp. It is widely used in aerospace and aviation testing to ensure materials can withstand high-altitude conditions. |
| ISO/IEC 17025 | The international standard for the competence of calibration and testing laboratories ensures that the equipment used in ASTM E490 testing is calibrated accurately and consistently. This compliance guarantees reliable test results. |
Why Choose This Test
- Comprehensive data on material performance under high-altitude solar irradiance conditions.
- Ensures regulatory compliance and certification for aerospace products.
- Supports R&D efforts by providing insights into material degradation mechanisms.
- Enhances product reliability in harsh space environments.
Use Cases and Application Examples
| Application Example | Description |
|---|---|
| Satellite Solar Panels | Solar panels must withstand high UV and IR radiation levels. ASTM E490 testing ensures that the materials used in these panels are robust enough to maintain efficiency over long periods. |
| Aircraft Skin Materials | The skin of aircraft exposed to the sun's rays can degrade quickly, affecting performance and safety. This test helps ensure that the materials chosen for this application are durable and reliable. |
