What feature is commonly found in thermal imaging NVGs?

Thermal imaging NVGs are specifically designed to detect heat signatures emitted by objects in their environment, which allows them to operate effectively in low-light conditions, including complete darkness. This technology relies on the principle that all objects emit infrared radiation based on their temperature, enabling the goggles to produce images based on these heat signatures. Unlike traditional night vision, which amplifies existing light sources, thermal imaging provides visibility based purely on temperature differences, making it invaluable for various applications such as search and rescue, military operations, and wildlife observation.

The other features mentioned do not accurately reflect the function of thermal imaging NVGs. For example, the idea of using synthetic light or LED lighting misrepresents the fundamental operation of thermal imaging, which does not rely on visible light. Additionally, while secondary power sources may be used in some NVG designs, it is not a common aspect tied specifically to thermal imaging technology.