TERMIUM Plus^®

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Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 OBS

laser identification, detection and ranging; LIDAR: designations standardized by NATO.  3, fiche 2, Anglais, - laser%20identification%2C%20detection%20and%20ranging

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 OBS

identification, détection et télémétrie par laser; LIDAR : désignations normalisées par l'OTAN.  3, fiche 2, Français, - identification%2C%20d%C3%A9tection%20et%20t%C3%A9l%C3%A9m%C3%A9trie%20par%20laser

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

Record number: 3, Textual support number: 1 OBS

differential absorption lidar; DIAL: designations standardized by NATO.  3, fiche 3, Anglais, - differential%20absorption%20lidar

Record number: 3, Textual support number: 1 DEF

An active remote sensing technique for measuring the atmospheric backscatter radiation from two transmitted laser pulses which are tuned at slightly different wavelengths.  4, fiche 3, Anglais, - differential%20absorption%20lidar

Fiche 3,  Justifications,  Français

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lidar à absorption différentielle; DIAL : désignations normalisées par l'OTAN.  3, fiche 3, Français, - lidar%20%C3%A0%20absorption%20diff%C3%A9rentielle

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Fiche 4,  Justifications,  Anglais

Record number: 4, Textual support number: 1 CONT

The Doppler lidar (DL) is an active remote sensing instrument that provides range- and time- resolved measurements of radial velocity and attenuated backscatter.  1, fiche 4, Anglais, - Doppler%20lidar

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lidar: A system for detecting the presence of objects or ascertaining their position or motion which works on the principle of radar, but uses laser radiation instead of microwaves.  2, fiche 4, Anglais, - Doppler%20lidar

Fiche 4,  Justifications,  Français

Record number: 4, Textual support number: 1 CONT

Le lidar Doppler mesure uniquement la composante du vent projetée sur l'axe de visée (vitesse radiale).  2, fiche 4, Français, - lidar%20Doppler

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lidar : système ou appareil de détection qui émet un faisceau laser et en reçoit l'écho, permettant de déterminer la distance d'un objet.  3, fiche 4, Français, - lidar%20Doppler

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Fiche 5,  Justifications,  Anglais

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Air and aerosols, however, normally do not emit light, but for a measurement of their speed are illuminated by light from the lidar transmitter.  1, fiche 5, Anglais, - lidar%20transmitter

Fiche 5,  Justifications,  Français

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[...] dispositif lidar qui permet l’acquisition d’un nuage de points en 3D (3 dimensions) de haute résolution dans lequel chaque point est associé à une réflectance et à une distance entre le point mesuré et l’émetteur lidar [...]  1, fiche 5, Français, - %C3%A9metteur%20lidar

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En milieu forestier, une portion des impulsions Lidar est reflétée par la surface du feuillage.  1, fiche 6, Français, - impulsion%20lidar

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In coherent Doppler lidar, heterodyning is achieved by mixing the backscattered radiation with light from a frequency-stable continuous-wave laser, i.e., the so-called local oscillator (LO).  4, fiche 7, Anglais, - coherent%20Doppler%20lidar

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Fiche 8,  Justifications,  Anglais

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A scanning lidar that emits a pulse of laser light ... into the atmosphere and utilizes Raman scattering in order to measure three return wavelengths, including backscatter due to elastic ... nitrogen ... and water ... signals.  2, fiche 8, Anglais, - Raman%20lidar

Record number: 8, Textual support number: 2 OBS

lidar: A system for detecting the presence of objects or ascertaining their position or motion which works on the principle of radar, but uses laser radiation instead of microwaves.  3, fiche 8, Anglais, - Raman%20lidar

Fiche 8,  Justifications,  Français

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Le lidar Rayleigh mesure simplement l'intensité de l'onde rétrodiffusée [...] Le lidar Raman mesure aussi l'intensité de l'onde rétrodiffusée, mais cette fois par diffusion Raman.  2, fiche 8, Français, - lidar%20Raman

Record number: 8, Textual support number: 1 OBS

lidar : système ou appareil de détection qui émet un faisceau laser et en reçoit l'écho, permettant de déterminer la distance d'un objet.  3, fiche 8, Français, - lidar%20Raman

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Fiche 9,  Justifications,  Anglais

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lidar: A system for detecting the presence of objects or ascertaining their position or motion which works on the principle of radar, but uses laser radiation instead of microwaves.  2, fiche 9, Anglais, - Mie%20lidar

Fiche 9,  Justifications,  Français

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[...] un lidar Mie ne peut mesurer ni la température de l’air, ni sa densité.  1, fiche 9, Français, - lidar%20Mie

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[...] à précision de mesure égale, le lidar Rayleigh nécessite environ 100 000 fois plus de signal qu’un lidar Mie.  1, fiche 9, Français, - lidar%20Mie

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lidar : système ou appareil de détection qui émet un faisceau laser et en reçoit l'écho, permettant de déterminer la distance d'un objet.  2, fiche 9, Français, - lidar%20Mie

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Fiche 10,  Justifications,  Anglais

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Besides limited experiments demonstrating that the method is feasible, there are up to now only a few reports of regular wind measurements to about 50 km altitude by Rayleigh lidar.  2, fiche 10, Anglais, - Rayleigh%20lidar

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Based on different kinds of backscattering, the lidar can be accordingly called Rayleigh lidar, Mie lidar, Raman lidar ...  3, fiche 10, Anglais, - Rayleigh%20lidar

Fiche 10,  Justifications,  Français

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Le lidar Rayleigh mesure simplement l'intensité de l'onde rétrodiffusée et permet ainsi de tracer une carte de la densité atmosphérique en fonction de l'altitude, et d'en déduire une carte en température de l'atmosphère.  2, fiche 10, Français, - lidar%20Rayleigh

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Fiche 11,  Justifications,  Anglais

Record number: 11, Textual support number: 1 DEF

An instrument combining a pulsed laser transmitter and optical receiver (usually a telescope) with an electronic signal processing unit used for the detection and ranging of various distant targets in the atmosphere, analogous to the principles of operation of microwave radar.  6, fiche 11, Anglais, - lidar

Record number: 11, Textual support number: 1 CONT

The lidar technique operates on the same principle as radar; in fact, it is sometimes called laser radar. The principal difference between lidar and radar is the wavelength of the radiation used. Radar uses wavelengths in the radio band whereas lidar uses light, that is usually generated by lasers in modern lidar systems.  7, fiche 11, Anglais, - lidar

Record number: 11, Textual support number: 2 CONT

There are three basic generic types of lidar: range finders, DIAL, and Doppler lidars. Rande finder lidars are the simplest lidars. They are used to measure the distance from the lidar instrument to a solid or hard target Differential Absorption Lidar (DIAL) is used to measure chemical concentrations (such as ozone, water vapor, pollutants) in the atmosphere. Doppler lidar is used to measure the velocity of a target High-resolution DEMs with vertical accuracy as good as 10 cm can be created with Lidar. Lidar is also better able to map bare earth elevations in forested or vegetated areas than other methods because only a single laser pulse needs to be able to reach between trees and the ground.  8, fiche 11, Anglais, - lidar

Record number: 11, Textual support number: 1 OBS

lidar: Coined word for light detection and ranging.  6, fiche 11, Anglais, - lidar

Fiche 11,  Justifications,  Français

Record number: 11, Textual support number: 1 DEF

Combinaison d'un laser et d'un récepteur accolés, destinée à étudier les échos produits par les particules de l'atmosphère sur des ondes visibles ou infrarouges.  5, fiche 11, Français, - lidar

Record number: 11, Textual support number: 1 OBS

La détection se fait par des cellules optiques suivies de photomultiplicateurs.  6, fiche 11, Français, - lidar

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Le lidar sert également à la localisation et à la poursuite télémétrique d'engins dans le ciel.  7, fiche 11, Français, - lidar

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lidar : acronyme dérivé du terme anglais «light detection and ranging» qui veut dire «détection et télémétrie par ondes lumineuses».  8, fiche 11, Français, - lidar

Fiche 11,  Justifications,  Espagnol

Record number: 11, Textual support number: 1 DEF

Aparato de detección y localización por ondas luminosas.  1, fiche 11, Espagnol, - lidar

Fiche 12,  Justifications,  Anglais

Record number: 12, Textual support number: 1 DEF

Method for investigating atmospheric behaviour using pulsed light beams (lasers).  7, fiche 12, Anglais, - light%20detection%20and%20ranging

Record number: 12, Textual support number: 1 CONT

Light detection and ranging (lidar) is a technique in which a beam of light is used to make range-resolved remote measurements. A lidar [instrument] emits a beam of light, that interacts with the medium or object under study. Some of this light is scattered back toward the lidar. The backscattered light captured by the lidar's receiver is used to determine some property or properties of the medium in which the beam propagated or the object that caused the scattering. The lidar technique operates on the same principle as radar; in fact, it is sometimes called laser radar. The principal difference between lidar and radar is the wavelength of the radiation used. Radar uses wavelengths in the radio band whereas lidar uses light, that is usually generated by lasers in modern lidar systems. The wavelength or wavelengths of the light used by a lidar depend on the type of measurements being made and may be anywhere from the infrared through the visible and into the ultraviolet. The different wavelengths used by radar and lidar lead to the very different forms that the actual instruments take. The major scientific use of lidar is for measuring properties of the earth's atmosphere, and the major commercial use of lidar is in aerial surveying and bathymetry (water depth measurement). Lidar is also used extensively in ocean research and has several military applications, including chemical and biological agent detection. Lidar can also be used to locate, identify, and measure the speed of vehicles. Hunters and golfers use lidar-equipped binoculars for range finding.  6, fiche 12, Anglais, - light%20detection%20and%20ranging

Fiche 12,  Justifications,  Français

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Méthode d'étude du comportement de l'atmosphère à l'aide de faisceaux lumineux pulsés (lasers).  4, fiche 12, Français, - d%C3%A9tection%20et%20t%C3%A9l%C3%A9m%C3%A9trie%20par%20ondes%20lumineuses

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La détection se fait par des cellules optiques suivies de photomultiplicateurs.  5, fiche 12, Français, - d%C3%A9tection%20et%20t%C3%A9l%C3%A9m%C3%A9trie%20par%20ondes%20lumineuses

Fiche 12,  Justifications,  Espagnol

Record number: 12, Textual support number: 1 DEF

Método para investigar las características atmosféricas usando pulsaciones de haces de luz (láser).  1, fiche 12, Espagnol, - lidar

Fiche 13,  Justifications,  Anglais

Record number: 13, Textual support number: 1 CONT

Doppler lidar is used to measure the velocity of a target. When the light transmitted from the lidar hits a target moving towards or away from the lidar, the wavelength of the light reflected/scattered off the target will be changed slightly. This is known as a Doppler shift - hence Doppler Lidar. If the target is moving away from the lidar, the return light will have a longer wavelength (sometimes referred to as a red shift), if moving towards the lidar the return light will be at a shorter wavelength (blue shifted). The target can be either a hard target or an atmospheric target - the atmosphere contains many microscopic dust and aerosol particles which are carried by the wind.  3, fiche 13, Anglais, - Doppler%20lidar

Fiche 13,  Justifications,  Français

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Lidar atmosphérique qui mesure l'effet Doppler sur le faisceau rétrodiffusé par des particules (diffusion de Mie) ou des molécules (diffusion de Rayleigh) du milieu, et permet de déduire la vitesse relative (celle du vent en attitude, par exemple).  2, fiche 13, Français, - lidar%20%C3%A0%20effet%20Doppler

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Fiche 14,  Justifications,  Anglais

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The imaging LIDAR prototype comprises a compact optical head, an electronic box, and is controlled via a PC. The transmitter produces 150 W peak power at 905 nm wavelength with two semiconductor lasers at 500 Hz rate. The light is coupled into optical fibres and directed to the target via a triplet lens. The backreflected light is collected with a receiver lens and fed through optical fibres to 18 avalanche photodiode detectors (APD).  2, fiche 14, Anglais, - imaging%20lidar

Fiche 14,  Justifications,  Français

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Capteur actif imageur utilisant comme source émettrice un laser.  3, fiche 14, Français, - lidar%20imageur

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Fiche 15,  Justifications,  Anglais

Fiche 15,  Justifications,  Français

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Lidar destiné à la détection et, au besoin, à la localisation de polluants et de certains constituants de l'environnement atmosphérique.  3, fiche 15, Français, - lidar%20atmosph%C3%A9rique

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Fiche 16,  Justifications,  Anglais

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A space-based lidar can provide global measurements of the vertical structure of clouds and atmospheric gases.  2, fiche 16, Anglais, - space%2Dbased%20lidar

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Optech aidera l'ASC [Agence spatiale canadienne] à relever le défi que pose la surveillance atmosphérique à l'échelle de la planète, notamment l'appauvrissement de la couche d'ozone , en développant un lidar spatial (radar optique) équipé d'un grand téléscope léger et déployable, offrant des données de grande qualité sur la troposphère et la stratosphère.  1, fiche 16, Français, - lidar%20spatial

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The Lidar In-Space Technology Experiment(LITE) is being developed by Nasa Langley Research Center for a series of flights on the space shuttle. Using a laser, a telescope approximately 1 meter in diameter and a modular design, the system will be used to study clouds, tropospheric and stratospheric aerosols, characteristics of the planetary boundary layer, stratospheric density and temperature pertubations, and to some degree, surface topography.  2, fiche 17, Anglais, - lidar%20in%2Dspace%20technology%20experiment

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Fiche 21,  Justifications,  Français

Record number: 21, Textual support number: 1 DEF

Instrument destiné à la mesure de profondeurs sous-marines à l'aide d'un laser.  1, fiche 21, Français, - bathym%C3%A8tre%20%C3%A0%20lidar

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Fiche 24,  Justifications,  Anglais

Record number: 24, Textual support number: 1 CONT

The laser (or lidar) velocimeter [lidar = light radar] operates in a fashion entirely analogous to that of the airborne Doppler weather radars likely soon to be available for detecting turbulence in storm cells. As with radars, the device detects air movements by observing the motion of particles suspended in the air and carried with it. The only significant difference is that a beam of coherent infrared radiation is used to scan ahead of the aircraft, instead of a beam (or series of pulses) of radio energy in the considerably longer-wavelength microwave band. The frequency of the back-scattered echoes or reflections undergoes Doppler shift detection by standard heterodyning techniques, which involve comparing the frequency of the reflected illumination with that of the original laser beam. Any reflecting object or material which has motion relative to the transmitter/receiver will cause a detectable shift in frequency, which can be isolated from the transmitter's own proper motion (over the ground) and thus yield a precise indication of the speed at which the air is moving several hundred metres in front of the aircraft. From this data, it is easy to compute what the air speed of the aircraft will be when it reaches that particular patch of air in a few seconds' time [and hence detect possible turbulence ahead].  2, fiche 24, Anglais, - laser%20velocimeter

Fiche 24,  Justifications,  Français

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Le principe de fonctionnement du vélocimètre à laser (ou lidar) est exactement le même que celui des radars météorologiques Doppler de bord, qui doivent être mis en service prochainement pour la détection des turbulences dans les systèmes d'orages.  1, fiche 24, Français, - v%C3%A9locim%C3%A8tre%20%C3%A0%20laser

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