31-01-2012, 06:54 PM
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B.vineela
31-01-2012, 06:54 PM
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01-02-2012, 11:27 AM
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01-02-2012, 12:54 PM
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06-02-2012, 09:50 PM
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07-02-2012, 10:25 AM
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12-05-2012, 03:29 PM
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20-10-2012, 04:33 PM
Night Vision Technology
NIGHT VISION TECHNOLOGY (CD).ppt (Size: 361.5 KB / Downloads: 24) PRINCIPLES OF NIGHT VISIONTECHNOLOGY THERMAL IMAGING:-Captures upper portion of infrared light spectrum, which emitted as heat by objects. Hotter objects emit more of this light. IMAGE ENHANCEMENT:-Collects tiny amounts of light,including lower portion of infrared spectrum . BASICS OF LIGHT Next to visible light spectrum lies infrared spectrum. Near IRwavelength(0.7 to 1.3)microns. Mid IRwavelength(1.3to 3)microns. Thermal IRwavelength(3 to 30)microns. Thermal is generated due to the respective energy levels of an atom CONCEPT OF ATOMS Atoms constantly move . Atoms can have different forms of energy as they have different states of excitation. Application of energy makes the atom transit from lower energy to higher energy level. Level of excitation depends on the amount of energy(heat,light or electricity)applied to it. Atom consists of a nucleus (protons&neutrons)& an electron cloud. Electrons moving in different orbits are its different energy levels. On application of heat, electrons from lower energy transit to higher energy orbital ,moving farther from the nucleus. At higher energy level electron tends to lose energy & return to the ground state. The emitted energy is in the form of photons. Photon emitted has a wavelength depending on the state of the electron’s energy . Heat causes the atoms in an object to fire off photons in the thermal infrared spectrum. Energy consumption generates heat . Hotter the object, shorter the wavelength of the infrared photon it releases. In visible spectrum, the photons glow red ,then through orange, yellow, blue and eventually white. In NIGHT VISION thermal imaging takes advantage of this infrared emission. THERMAL IMAGING The lens captures infrared light emitted by all the objects. The captured infrared light is scanned by infrared detector. Infrared detector creates temperature pattern called Thermogram which takes 1/13’th of a second. Thermogram created by detector is transformed to electric impulse. GENERATIONS GENERATION 0This system was made by U.S Army used in WW2 & Korean war. The concept of IR Illuminator were used in NVD’s .Hostile nations duplicated NVD and saw the projected beam of the Illuminator. GENERATION 1U.S Army switched from active to passive light , changed the source from infrared light to the ambient light provided by the stars, moon .NVD’s called the “STARLIGHT”. GENERATION 2Image intensifier were developed which improved the performance and resolutions . Addition of michrochannel resulted in seeing the images in extreme darkness. GENERATION 3Currently used in U.S.Military .This is the most advanced & the latest NVD technology because it has lead to the improvement in the IR Illuminator,photo cathode(gallium arsenide).Without proper license of the U.S department ,these NVD’s can’t be exported or imported. |
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