TERMIUM Plus^®

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

device for measuring velocity of propagation of P- and S-waves in materials, soils, etc.  1, record 2, English, - ultrasound%20velocimeter

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 OBS

ultrasonique : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2006).  2, record 2, French, - c%C3%A9l%C3%A9rom%C3%A8tre%20ultrasonique

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

An instrument used for the in situ measurement of the speed of sound in the sea and other natural waters.  3, record 3, English, - velocimeter

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Appareil immergé permettant de mesurer la vitesse de propagation du son dans l'eau.  3, record 3, French, - c%C3%A9l%C3%A9rim%C3%A8tre

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 CONT

The laser Doppler velocimeter sends a monochromatic laser beam toward the target and collects the reflected radiation. According to the Doppler effect, the change in wavelength of the reflected radiation is a function of the targeted object's relative velocity. Thus, the velocity of the object can be obtained by measuring the change in wavelength of the reflected laser light, which is done by forming an interference fringe pattern(i. e. superimpose the original and reflected signals).  3, record 4, English, - laser%20Doppler%20velocimeter

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 CONT

Un [...] instrument recourant à des faisceaux laser est le vélocimètre Doppler à laser de la Survey and General Instruments Company. Le vélocimètre [...] permet la mesure de la vitesse de fluides et de poudres en mouvement.  1, record 4, French, - v%C3%A9locim%C3%A8tre%20Doppler%20%C3%A0%20laser

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, 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, record 5, English, - laser%20velocimeter

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 CONT

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, record 5, French, - v%C3%A9locim%C3%A8tre%20%C3%A0%20laser

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 CONT

The germanium plate [of the laser velocimeter] acts as a beam-splitter for diverting the scattered return signal into the detector, while the quarter-wave plate acts as a vertical polarizing screen.  1, record 6, English, - vertical%20polarizing%20screen

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 CONT

La lame de germanium [du vélocimètre à laser] agit comme séparateur de faisceau pour diriger dans le détecteur le signal de retour, tandis que la lame quart d'onde sert d'écran de polarisation verticale.  1, record 6, French, - %C3%A9cran%20de%20polarisation%20verticale

Record 6,  Textual support,  Spanish

Record 7,  Textual support,  English

Record number: 7, Textual support number: 1 CONT

[The production version] of the laser velocimeter and its mounting cradle(...) would be considerably smaller, probably with an integral cooling system and greatly simplified spectrum analyzer unit, and could be co-mounted(possible with a chin blister for the laser telescope) together with a weather radar antenna.  1, record 7, English, - mounting%20cradle

Record 7,  Textual support,  French

Record number: 7, Textual support number: 1 CONT

Le vélocimètre à laser sur son bâti de montage. Le modèle de série serait considérablement plus petit. Il posséderait vraisemblablement un dispositif de refroidissement intégré et un analyseur de spectre très simplifié. Il pourrait être installé à côté d'une antenne de radar météorologique (avec éventuellement une coupole sous le nez de l'avion pour loger le télescope à laser).  1, record 7, French, - b%C3%A2ti%20de%20montage

Record 7,  Textual support,  Spanish