| At the mention of night vision devices, images can | | | | near infrared spectrum to visible images that enables |
| come to mind like spy and action movies, soldiers | | | | the eye to see objects as far as 200 feet in near |
| scouring an area with the device at night, helicopters | | | | complete darkness. This night vision device displays a |
| hovering overhead aiding the police in tracking fugitives | | | | green image because the peak sensitivity of the |
| or detectives using the device to spy on people they | | | | human vision is near the green range. It also uses two |
| were assigned to track. | | | | different technologies depending on your choice of the |
| Night vision devices are actually light enhancing and | | | | night vision device. |
| thermal imaging tools. It makes a particular subject | | | | One uses the Image enhancement where the night |
| visible by the warmth it emits or observable by using | | | | vision device enables the viewer to see images by |
| limited light. It enhances a spectral range making the | | | | collecting tiny amounts of light that may already be |
| viewer see lights and images that would otherwise | | | | imperceptible and amplifying it to make the image |
| have been invisible to the bare human eye. The normal | | | | visible. The other is through thermal imaging where the |
| human eye is capable to seeing images that are | | | | heat emitted by the subject is used and translated into |
| confined to a certain electromagnetic spectrum that | | | | images. The principle is that hotter objects tend to |
| the brain interprets. Night vision devices may use | | | | transmit more light than the cooler ones like stones and |
| another source of light that enhances images enabling | | | | trees. |
| the user to detect objects that improves the detection | | | | Night vision devices were originally intended for military |
| capacity of the normal eye. | | | | use to aid them in tracking down an opponent at night. |
| In theory the human eye can see these weaker | | | | It has evolved now into many different uses. |
| sources of lights but the brain has a way of filtering | | | | Lately night vision devices are finding use outside of |
| out these lights that we are only capable of seeing a | | | | the military and police detection work. When you are |
| very limited number of photons. With the aid of a night | | | | out camping, night vision devices could prove very |
| vision device, these photons intensified by the photo | | | | helpful. Businesses have also been installing night vision |
| multiplier tube enables us to see different colors of | | | | devices within and without their properties to enable |
| lights in a subject. When seen though and NVD, an | | | | them to observe if something has been touched or |
| image that is nearly invisible becomes observable. | | | | changed during the night. Night vision devices are also |
| Many animals have this capacity to see through the | | | | proving to have invaluable aid in detecting soil that |
| dark. Animals that can hunt at night uses a larger | | | | have been disturbed, buried objects, footprints and |
| optical aperture, an improved composition in the retina, | | | | almost anything that needs to be determined in |
| optics that are more photo-efficient that enables them | | | | instances where there is very limited lighting. |
| to use weak lights and see better in the dark. | | | | Some of the more common applications for the night |
| Night vision devices that most people are familiar with | | | | vision devices are entertainment, hidden-object |
| are the night vision goggles. This night vision device has | | | | detection, hunting, law enforcement, military, navigation, |
| an image intensifier that converts weak lights from the | | | | security, surveillance and wildlife observation. |