Precision N-BK7 Ar-coating Optical Hemispherical Dome Lens For Sun Light Sensor

1. Material & Construction

• Optical Substrate: Schott N-BK7 borosilicate glass (Grade A homogeneity)

• Geometry: True hemispherical dome (180° field of view)

• Coating: Broadband AR coating (300–2500nm, >98.5% avg. transmission)

• Sealing: Hermetic edge bonding for IP68-rated environmental protection

2. Critical Properties

• Spectral Performance:

  • 90% transmission from 350–2000nm (uncoated)

  • <0.2% reflection loss per surface (coated)

• Environmental Durability:

  • Thermal cycling: -50°C to +150°C operational range

  • UV degradation: <0.1%/year @ 1000 W/m² solar exposure

• Optical Precision:

  • Surface accuracy: λ/8 @ 632.8nm

  • Refractive index homogeneity: <5 × 10⁻⁶

3. Core Functions

• Omnidirectional Light Capture: 180° FOV for accurate solar irradiance measurement

• Optical Path Preservation: Maintains collimation through curved interface

• Environmental Shielding: Protects sensors from rain/dust while minimizing Fresnel losses

• Calibration Stability: Near-zero angular dependence (±0.5% responsivity variance)

4. Key Applications

• Solar Monitoring Systems:

  • Pyranometers & pyrheliometers (ISO 9060 compliant)

  • PV panel efficiency sensors

• Meteorological Stations:

  • Daylight harvesting sensors

  • UV index monitors

• Aerospace Instruments:

  • Satellite solar flux detectors

  • Rover environmental sensors

• Agricultural Tech:

  • Photosynthetically active radiation (PAR) sensors