“infra” is a word used in written English, and it is an abbreviation of the Latin phrase "infra red" meaning below or beneath.
Example sentence: The infra-red camera provided insight into the otherwise inaccessible parts of the structure.
Eye tracking may also find use in desktop computers, video-games consoles and e-readers.Eye trackers combine a camera with an infra-red light source that illuminates the eye with bursts of invisible infra-red light.
All these different areas reflect different amounts of infra-red light, which is picked up by the camera.
This material preferentially absorbs, and is thus heated and expanded by, infra-red radiation with a wavelength of three microns (millionths of a metre).
Small, light, infra-red sensors would be a boon to medical science, the emergency services, the armed forces and the police.
It can see objects on the ground as small as four metres across, and its "hyperspectral" imaging system (which combines visible with infra-red light) can distinguish between various types of metal, rock and other materials.
Stars and planets form within swirling clouds of dust and gas that visible light cannot penetrate, but which infra-red radiation can.
Its beautiful images have introduced a generation to the wonders of astronomy.So in 2002, when the agency considered plans for a successor that would study the universe in infra-red, rather than visible light, would be ready to fly in 2010 and would cost just $2.5 billion, saying "yes" was easy.
One potential sacrifice is WFIRST, an infra-red space telescope intended for launch in 2020.
The first is Designated Short Range Communication (DSRC), which relies on microwave or, less frequently, infra-red signals.
