The dome at the upper end of the radiometer is a specialized structure used to collect and concentrate solar radiation. A radiometer is a device used to measure solar radiation, which measures the radiation emitted by the sun, both direct and scattered.
The dome atop the heliometer is engineered to maximize the collection of solar radiation from all directions to guarantee the accuracy and reliability of the measurement. The design of the dome considers the characteristics of solar radiation, including its wavelength range (0.15 to 4.0μm) and how it propagates through the Earth's atmosphere. Through the specialized design of the dome, it can effectively collect the direct and scattered radiation of the sun, thereby providing precise data for scientific research. Additionally, the dome design also takes into account the reduction of interference from other sources, such as radiation from the Earth and other celestial bodies, to ensure that the measured data is purer and more accurate. This design enables the solar radiometer to make precise Measurements under various environmental conditions and provides significant data support for scientific research.
| Structure | Hemisphere/hyper-hemisphere |
| Material | BK7/BK10/H-K9L/Fused silica |
| Diameter | Ø10mm-Ø50mm |
| Diameter tolerance | ±0.1mm |
| Thickness tolerance | +0.0mm/-0.1mm |
| Surface quality | 20/10 |
| Surface accuracy | 3 (1) |
| Type No. | Out diameter | Height | Wall thickness |
| (mm) | (mm) | (mm) | |
| DW-10 | 10 | 5 | 1 |
| DW-15 | 15 | 8 | 1.5 |
| DW-24-A | 24 | 12 | 2 |
| DW-24-B | 24 | 13 | 2 |
| DW-25-A | 25 | 12.5 | 2 |
| DW-25-B | 25 | 12.5 | 4 |
| DW-25-C | 25 | 14.5 | 2 |
| DW-28-A | 28 | 14 | 1.5 |
| DW-28-B | 28 | 16 | 1.5 |
| DW-30-A | 30 | 15 | 2 |
| DW-30-B | 30 | 16 | 2 |
| DW-30-C | 30 | 16 | 4 |
| DW-30-D | 30 | 16.5 | 2 |
| DW-30-E | 30 | 17 | 2 |
| DW-32-A | 32 | 16 | 2 |
| DW-32-B | 32 | 15 | 4 |
| DW-32-C | 32 | 17 | 2 |
| DW-32-D | 32 | 17 | 4 |
| DW-36 | 36 | 18 | 2 |
| DW-40-A | 40 | 20 | 2 |
| DW-40-B | 40 | 21 | 2 |
| DW-50-A | 50 | 25 | 2 |
| DW-50-B | 50 | 25 | 4 |
| DW-50-C | 50 | 26 | 2 |
| DW-50-D | 50 | 26.6 | 2 |
| DW-50-E | 50 | 28 | 2 |
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