Talk:Chemical Sciences: A Manual for CSIR-UGC National Eligibility Test for Lectureship and JRF/Near-infrared spectroscopy

THE IR TECHNICAL With the development of economy, people in meet the basic needs of clothing, food, shelter, after the trip, People use these ir led and ir led strips http://www.ledlightmake.com/infrared-ultraviolet-led-strip-c-80_92/led-infrared-940nm5mroll-smd5050flexible-ir-emitting-diode-p-250.htmlto connect with Their lives, Especially personal and asset security needs naturally elevated to a new height. Video monitoring because of its intuitive and continuity to become preferred way of security technology. Infrared night vision camera in meet the night environment hidden and shoot clear picture is widely used in video surveillance.

The technical principle

Infrared night vision camera is mainly used in visible strong light or dark light environment, using infrared transmitter device active infrared light is projected onto the object, after the infrared light reflected from an object, and enters the lens final the picture are emerging. At this time we are seeing is the reflection of infrared light into the screen, rather than visible light reflection into the picture, then it can be taken to the dark environment, invisible to the naked eye images Light is an electromagnetic wave, the wavelength range from several nanometers (1nm=10-9m) to 1 mm (mm). Visible to the human eye is only part what is called visible light and visible light in the wavelength range of 380nm~780nm and visible light wavelength from long to short is divided into red, orange, yellow, green, cyan, blue, purple, violet wavelength than known as the short ultraviolet wavelengths than red long known as the red outside light. Often people will be divided into the near infrared and far infrared, in the three part. Near infrared wave length of 0.75 ~ 3 micron to; infrared refers to the wavelength of 3 ~ 20 micron; far infrared refers to a wavelength of 20 to 1000 microns. Because the infrared light to visible light, the naked eye can not see it in the space of existence, and therefore an LED that emits infrared light emitting diode infrared light active form of infrared light is widely used in night vision surveillance require covert, in place Traditional low lights hidden night vision surveillance .Infrared light have different power and wavelength of 715、 850nm, two kind wavelength determines the different infrared distance and effect