激光測距儀外文翻譯-其他專業(yè)-展示頁
2025-01-31 03:41本頁面
【正文】 copic to roughly half the height of the laser beam39。φ/ω=c/(4πf) (Nπ+Δφ)=c/4f (N+ΔN)=U(N+) in this equation, U stands for the unit length. Δφ stands for the delay part which does not fulfill π. ΔN stands the decimal value. Discrimination Some instruments are able to determine multiple returns, as above. These instruments use waveformresolving detectors, which means they detect the amount of light returned over a certain time, usually very short. The waveform from a laser pulse that hits a tree and then the ground would have two peaks. The first peak would be the distance to the tree, and the second would be the distance to the ground. Using wavefront sensing, it is possible to determine both the closest and the farthest object at a given point. This makes it possible for aircraftmounted instruments to see through dense canopies[clarification needed Please explain how lasers see through canopies] and other semireflective surface such as the ocean, leading to many applications for airborne instruments such as: 1. Creating bare earth topographic maps removing all trees 2. Creating vegetation thickness maps 3. Bathymetry(measuring topography under the ocean) 4. Forest firehazard Technologies Time of flight this measures the time taken for a light pulse to travel to the target and back. With the speed of light known, and an accurate measurement of the time taken, the distance can be calculated. Many pulses are fired sequentially and the average response is most monly used. This technique requires very accurate subnanosecond timing circuitry. Multiple frequency phaseshift this measures the phase shift of multiple frequencies on reflection then solves some simultaneous equations to give a final measure. Interferometry the most accurate and most useful technique for measuring changes in distance rather than absolute distances. Applications Military An American soldier with a GVS5 laser rangefinder. A Dutch ISAF sniper team displaying their Accuracy International AWSM .338 Lapua Magnum rifle and Leica/Vectronix VECTOR IV laser rangefinder binoculars. Rangefinders provide an exact distance to targets located beyond the distance of pointblank shooting to snipers and artillery. They can also be used for military reconciliation and engineering. Handheld military rangefinders operate at ranges of 2 km up to 25 km and are bined with binoculars or monoculars. When the rangefinder is equipped with a digital magic pass (DMC) and inclinometer it is capable of providing magic azimuth, inclination, and height (length) of targets. Some rangefinders can also measure a target39。t reflect laser light very well and using a laser rangefinder on them is difficult. 3D Modelling This LIDAR scanner may be used to scan buildings, rock formations, etc., to produce a 3D model. The LIDAR can aim its laser beam in a wide range: its head rotates horizontally, a mirror flips vertically. The laser beam is used to measure the distance to the first object on its path. Laser rangefinders are used extensively in 3D objec
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