Thermal cameras are used to detect and capture the heat energy emitted from an object or a person. The thermal camera lens is a critical component of the camera system as it helps to focus and capture the infrared radiation emitted from the object being imaged. Here are some important things to know about thermal camera lenses:
Types of lenses: There are different types of thermal camera lenses, including fixed lenses, zoom lenses, and manual focus lenses. Fixed lenses have a fixed focal length and can’t be adjusted, while zoom lenses can be adjusted to change the focal length. Manual focus lenses require the user to manually adjust the focus.
Focal length: The focal length of a lens determines the distance at which an object can be clearly imaged. A lens with a shorter focal length is better suited for imaging objects that are closer, while a lens with a longer focal length is better suited for imaging objects that are farther away.
Field of view: The field of view of a lens is the angle of the scene that can be captured by the camera. A lens with a wider field of view can capture a larger scene, while a lens with a narrower field of view can capture a smaller scene but with greater detail.
Lens materials: Thermal camera lenses are typically made of germanium or silicon, which are both good at transmitting infrared radiation. Germanium is more expensive but has a higher refractive index, which allows for better focusing of infrared radiation.
Lens coatings: To improve the performance of thermal camera lenses, they may be coated with special materials that help to reduce reflection and increase transmission of infrared radiation. Coatings may also be added to protect the lens from scratches, dirt, and other contaminants.