They began to search actively for the signal, eventually achieving perfect scores in tracking and identifying the correct location of the invisible light source.
The other is a non-contact method by detecting intensity of the invisible infrared light that naturally emanates from every surface in this Universe.
It works by combining a 3D sensor with a projector that emits an invisible, infrared light in a complex pattern.
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The name draws on old ideas about a supposedly ubiquitous, invisible medium that helped light propagate.
He could detect shallower water by colour, and see the light of invisible lagoons reflected in the undersides of clouds.
Freestanding units -- upright appliances about four feet tall that look like hair dryers from "The Jetsons" era -- power the invisible beams of harmless light.
Light deflects around invisible matter in the same way that water ripples over hidden stones.
In order to see light, the eye must absorb it, but in order for a person to be invisible, the body must not absorb any light.
The concept is certainly familiar, and functions in much the same way as a QR code, generating flashing light that's invisible to the human eye instead of a cumbersome 2D square.
In those last years, when my life seemed to have been shrouded in an invisible damp mist, she was the torch by whose weak and gentle light I could guide my steps.
This lets a few light waves through to help focus the image, even though they are invisible on the final product.
For straight ahead, there are some night vision systems on the market that use a camera that sees reflected infrared light, to detect warm bodies like pedestrians or deer that would otherwise be invisible.
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Light can either be guided around or cancelled by a material that makes an object invisible to an observer.
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