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Lidar (/ ˈ l aɪ d ɑːr /, also LIDAR, LiDAR or LADAR, an acronym of "light detection and ranging" [1] or "laser imaging, detection, and ranging" [2]) is a method for determining ranges by targeting an object or a surface with a laser and measuring the time for the reflected light to return to the receiver.
Length measurement, distance measurement, or range measurement (ranging) all refer to the many ways in which length, distance, or range can be measured. The most commonly used approaches are the rulers, followed by transit-time methods and the interferometer methods based upon the speed of light. Surveying is one ancient use of measuring long ...
LiDAR technology (Light Detection and Ranging) is a remote sensing technique that obtains precise 3-D information and distance. [4] The laser receptor calculates the distance by the travelling time between emitting and receiving laser pulses. [4] LiDAR produces topographic maps, and it is useful for assessing the natural environment.
[9] [10] The new device, named colidar (coherent light detection and ranging), gained widespread publicity [11]. [12] In 1962, L. Smullin and G. Fiocco used a ruby laser to detect echoes from the Moon. [13] During their experiments they observed light scattered in the upper atmosphere that they attributed to dust particles. [14]
Light waves can be used as radar frequencies, in which case the system is known as lidar. This is short for "LIght Detection And Ranging," similar to the original meaning of the initialism "RADAR," which was RAdio Detection And Ranging. Both have since become commonly-used english words, and are therefore acronyms rather than initialisms.
The two-way travel time of the radiation could infer the distance as the speed is approximately equal to the speed of light, roughly 3 x 10^8 m/s. This allows application in ranging in light detection and ranging (LiDAR) and Radio detection and ranging (Radar) etc. [1]
Light detection and ranging (LIDAR) is used for weapon ranging, laser illuminated homing of projectiles, and to detect and measure the concentration of various chemicals in the atmosphere while airborne LIDAR can be used to measure the heights of objects and features on the ground more accurately than radar technology.
LEDDAR (Light-Emitting Diode Detection And Ranging) is a proprietary technology owned by LeddarTech. It uses the time of flight of light signals and signal processing algorithms to detect, locate, and measure objects in its field of view.
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