Which material is commonly used for thermal camera lenses?

The use of germanium in thermal camera lenses is due to its unique properties that are particularly suitable for infrared applications. Germanium is a semiconducting material that has a high transmittance for infrared radiation, which is crucial for thermal imaging. Unlike standard glass or plastic, germanium enables the camera to capture thermal energy effectively, as it can transmit wavelengths in the infrared spectrum, particularly in the 8 to 12 micrometers range, which is essential for thermal imaging. This allows for clearer and more accurate thermal readings, making it the preferred choice for high-performance thermal camera lenses.

In contrast, while glass may be used in some optical applications, it typically does not offer the same level of infrared transmittance as germanium. Plastic materials can be less effective in terms of durability and optical quality, especially in challenging thermal environments. Silicone, while useful in various applications, lacks the necessary characteristics needed for precise infrared transmission in thermal imaging. Thus, germanium stands out as the optimal material for thermal camera lenses.