what is LIDAR(PHOTOGARMMETRY)?
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its a meteorological instrument using transmitted and reflected laser light for detecting atmospheric particles, as pollutants, and determening their elevation, concentration etc.
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A laser (from the acronym Light Amplification by Stimulated Emission of Radiation) is an optical source that emits photons in a coherent beam. The verb to lase means "to produce coherent light" or possibly "to cut or otherwise treat with coherent light", and is a back-formation of the term laser.\n\nLaser light is typically near-monochromatic, i.e. consisting of a single wavelength or color, and emitted in a narrow beam. This is in contrast to common light sources, such as the incandescent light bulb, which emit incoherent photons in almost all directions, usually over a wide spectrum of wavelengths.
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LASER = Light Amplification by Stimulated Emission of Radiation\n\n     Well, let me try to explain this a little more fully.  A laser is a more complex light source than most.  It relies on stimulating electrons in atoms to jump to a higher state.  A laser creates a large population inversion (many atoms with excited electron states).  When these electrons return to their original states, they emit certain wavelengths of light.\n\n     Therefore, in a laser, all of the light is organized and has the same wavelength, rather than the randomized light from most light sources (light bulbs, etc.).  In the laser, there is also a pair of mirrors that causes this light to reflect back and forth, stimulating more electrons in the process.  One of these mirrors is only semi-silvered, so some light can escape from this chamber.  This escaping light is the laser.
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Optical mice use an LED and a camera to rapidly capture images of the surface beneath the mouse.  The infomation from the camera is analyzed by a DSP (Digital Signal Processor) and used to detect imperfections in the underlying surface and determine motion. Some materials, such as glass, mirrors or other very shiny, uniform surfaces interfere with the ability of the DSP to accurately analyze the surface beneath the mouse.  \nSince glass is transparent and very uniform, the mouse is unable to pick up enough imperfections in the underlying surface to determine motion.  Mirrored surfaces are also a problem, since they constantly reflect back the same image, causing the DSP not to recognize motion properly. When the system is unable to see surface changes associated with movement, the mouse will not work properly.
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Here ya go!\n\nhttp://science.howstuffworks.com/laser.htm
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Infrared\nFrom Wikipedia, the free encyclopedia\nJump to: navigation, search\nImage of a small dog taken in mid-infrared ("thermal") light (false color)\nEnlarge\nImage of a small dog taken in mid-infrared ("thermal") light (false color)\n\nInfrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of microwave radiation. The name means "below red" (from the Latin infra, "below"), red being the color of visible light of longest wavelength. Infrared radiation spans three orders of magnitude and has wavelengths between approximately 750 nm and 1 mm.
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A dual radio frequency interferometer aided by laser rangefinder and terrain database system utilizes two linear rays of RFI sensors to determine the position of a source of RF energy. The dual RFI system is very attractive in that it is a passive system and cannot be detected by other sensors or systems while it is going through its position determination operation. Furthermore, use of two linear arrays of sensors allows for the elimination of chronic effects inherent in radio frequency interferometers. The two linear arrays can be placed anywhere on a vehicle as long as they are in the same common geometric plane and in-flight mechanisms are provided to transform the coordinate systems from the in-flight platform coordinates to the local geodetic coordinates. This provides positioning and source identification which can be beneficial to not only the present system but other systems in the area. With the two linear arrays, a line-of-sight vector can be determined and other systems can be provided with this information in order to provide further details of the source position. Once a pointing vector has been determined, this information can be used with other active systems in order to provide a precise range and location of the source of the RF signals.
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The candela (symbol: cd) is the SI base unit of luminous intensity (that is, power emitted by a light source in a particular direction, with wavelengths weighted by the luminosity function, a standardized model of the sensitivity of the human eye).
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He described the phenomenon of the compression of sound waves as the source approached the observer and the expansion as the source moved away from the observer. This is known as the doppler effect. It also applies to light which has been very useful in science. a laser beam can be split into and the seperate beams turned at 90 degree angles to the original beam and 180 degrees to each other the phase shift will indicate which way the device is moving and at what rate. This is called a laser "gyro". A doppler radar uses the shift in frequency of radar waves to determine the speed and direction of a target. The doppler radar is of course very useful for weather.
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XP Lasersport is a game of laser tag, more info here\n\nhttp://www.xplasersport.com/
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a pin-hole camera (see en.wikipedia.org/wiki/Pinhole_camera)\nor kaleidoscope (see en.wikipedia.org/wiki/Kaleidoscope)\nmay be interesting projects.
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these are read with basic images.  rather than crossing a laser beam across it, a "photograph" of the pattern is taken, and a binary code can be read using the light and dark areas of the pattern.
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coz laser beam is used to write data onto the cd
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The following link is about the single perspective camera. \n\nDid not really understand your comments about the question. \nI was thinking aboutGeometry was a function in a application called 3D VISION. So I just answered the question and ignored the comments.
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Electromagnetic waves.  That includes x, gamma, visible light etc...\n\nGravitational waves.
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A Laser jammer uses a infra-red LEDs or laser diodes to distort the signal of the police lidar gun.\n\nA great place to find out about laser jamming products results would be to go to the websites I linked below: http://guysoflidar.com/index.html\nhttp://guysoflidar.com/radar-detector-laser-jammer-shootout-2005/laser-jammer-tests.html\nhttp://guysoflidar.com/laser-jammer-test-july-2005/index.html\nRocky Mountain Radar products do NOT work!\nhttp://www.radarjammer.com/\n\nYou can see some videos of Laser jammers and Laser stealth coating here:\nhttp://www.laserveil.com/cool%5Fvideos/
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http://spaceplace.nasa.gov/en/kids/laser/index.shtml