Editing Night vision (section)

=== Active illumination ===
[[File:M3 Sniperscope.jpg|thumb|[[USMC]] M3 Sniperscope assembled on a [[M1 Carbine|M3 Carbine]]. Introduced during the [[Korean War]], it was an early active infrared night vision equipment powered by a large 12 volt battery that was carried in a rubberized canvas backpack.]]
[[File:M60 PattonMediumTank.jpg|thumb|An [[M60 tank]] with an infrared searchlight mounted on the cannon.]]

Active illumination couples imaging intensification technology with an active source of illumination in the [[near infrared]] (NIR) or shortwave infrared (SWIR) band. Examples of such technologies include low light cameras.

Active infrared night-vision combines infrared illumination of spectral range 700–1,000&nbsp;nm (just over the [[visible spectrum]] of the human eye) with sensors or [[charge-coupled device|CCD]] cameras sensitive to this light. The resulting scene, which is apparently dark to a human observer, appears as a monochrome image on a normal display device.<ref>{{cite web |title=YouTube mp3 indir |url=https://mp3video.org/ |website=mp3video.org}}</ref> Because active infrared night-vision systems can incorporate illuminators that produce high levels of infrared light, the resulting images are typically higher resolution than other night-vision technologies.<ref>{{cite web|url=http://www.irinfo.org/articles/03_01_2007_grossman.html |title=Thermal Infrared vs. Active Infrared: A New Technology Begins to be Commercialized |url-status=dead |archive-url=https://web.archive.org/web/20100117205639/http://www.irinfo.org/articles/03_01_2007_grossman.html |archive-date=January 17, 2010 }}</ref><ref>{{Cite web |url=http://www.extremecctv.com/products_video.php?vid=19 |title=Extreme CCTV Surveillance Systems |access-date=2008-01-24 |archive-url=https://web.archive.org/web/20080405225223/http://www.extremecctv.com/products_video.php?vid=19 |archive-date=2008-04-05 |url-status=dead }}</ref>  Active infrared night vision is now commonly found in commercial, residential and government security applications, where it enables effective night time imaging under low-light conditions. However, since active infrared light can be detected by night-vision goggles, there can be a risk of giving away position in tactical military operations.

Laser range gated imaging is another form of active night vision which utilizes a high powered pulsed light source for illumination and imaging. Range gating is a technique which controls the laser pulses in conjunction with the shutter speed of the camera's detectors.<ref>{{cite journal |author1=J. Bentell |author2=P. Nies |author3=J. Cloots |author4=J. Vermeiren |author5=B. Grietens |author6=O. David |author7=A. Shurkun |author8=R. Schneider | title = FLIP CHIPPED InGAaS PHOTODIODE ARRAYS FOR GATED IMAGING WITH EYE-SAFE LASERS  | url = http://www.couriertronics.com/docs/Xenics/Gated%20Imaging.pdf }}</ref> Gated imaging technology can be divided into ''single shot'', where the detector captures the image from a single light pulse, and ''multi-shot'', where the detector integrates the light pulses from multiple shots to form an image. One of the key advantages of this technique is the ability to perform [[target recognition]] rather than mere detection, as is the case with thermal imaging.