What is Long-Wave Infrared (LWIR)?
- Wavelength Range: Typically 8 to 14 micrometers (μm)
- This band is where most thermal radiation from objects at or near room temperature is emitted.
- It’s ideal for passive thermal imaging, meaning no external light source is needed.
Thermal Imaging Lenses – What They Do:
Focus and direct LWIR radiation onto a thermal sensor array (like microbolometers).
The lens materials (like germanium, chalcogenide glass, or zinc selenide) are specifically chosen because they:
- Are transparent to LWIR
- Withstand environmental conditions
Maintain image clarity and sensitivity
Typical Applications:
- Industrial inspection (electrical panels, mechanical systems)
- Medical screening (body temperature monitoring)
- Building diagnostics (leaks, insulation issues)
- Security and surveillance
- Military/defense (night vision, target detection)