GJB 2502.3-2015 in English
VALIDTest method for thermal control coatings of spacecraft. Part 3: Measurement of emissivity
- Issued on:2015-12-19
- Implemented on:2016-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$194.00
| Standard No: | GJB 2502.3-2015 |
| Document status: | VALID |
| Title in English: | Test method for thermal control coatings of spacecraft. Part 3: Measurement of emissivity |
| Title in Chinese: | 航天器热控涂层试验方法 第3部分：发射率测试 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2015-12-19 |
| Implemented on: | 2016-03-01 |
| Professional Classification: | GJB-Military |
| Related Keywords: | test method method
satellite thermal control coatings test method test method 2502.3-2015 standard name test method normal emissivity method |
| Related Topics: | Aerodynamic test of spacecraft thermal control coating
Thermal Control Coating emissivity gjb 2015 Thermal control Spacecraft hemispherical reflectance High emissivity hemispherical reflectance Spacecraft heat pipe test method Dual-band emissivity tester test Spacecraft thermal control coating test methods Chinese Spaceflight |
Introduction
Standard Evolution and Framework
| Comparison Dimensions | GJB 2502-1995 | GJB 2502.3-2015 |
|---|---|---|
| Standard Name | Test Method for Satellite Thermal Control Coatings | Test Method for Spacecraft Thermal Control Coatings Part 3 |
| Test Method | Method 310/330/350/370 | Method 2011/2021/2031/2041 |
| New Technologies | - | Radiometer Method (Method 2031) |
Analysis of Core Test Methods
1. Steady-state Calorimeter Method (Method 2011)
The hemispherical emissivity is calculated by the principle of electric power compensation using a vacuum cold wall device with a test range of 0.03-0.98 and an accuracy of ±0.01. Key equipment includes:
- Main/auxiliary heating system
- Liquid nitrogen constant temperature heat sink (emissivity ≥ 0.90)
- Standard resistor with accuracy of 0.05%
2. Normal emissivity method (Method 2021)
Based on the blackbody cavity comparison principle, using planar thermopile detector, the test range is 0.04-0.98, and the accuracy is ±0.015.
- Metal substrate thickness ≤ 1.8mm
- 40mm×40mm standard size
- Surface roughness Ra ≤ 0.8μm
Implementation suggestions
Method selection guide
| Application scenarios | Recommended methods | Advantages |
|---|---|---|
| Precise laboratory measurement | Steady-state calorimeter method | Full-band measurement |
| On-site rapid detection | Radiometer method | Portable and efficient |
Key points of quality control
- Regularly calibrate the blackbody cavity (emissivity ≥ 0.90)
- Maintain vacuum degree ≤ 1.0×10-3Pa
- Sample temperature fluctuation control ≤ ± 0.1℃
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