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REFLECTING BAND [2 records]

Record 1 1997-06-04

English

Subject field(s)
  • Textile Industries
  • Textiles: Preparation and Processing
  • Technical Textiles
CONT

The straps are woven in tubular form with a foam layer inside: the yarn used is a 800 deniers polypropylene, spun dyed ... It is possible, at the weaving stage to customise the straps and insert for example reflecting bands ... for safety.

French

Domaine(s)
  • Industries du textile
  • Apprêt et traitements divers (Textiles)
  • Textiles techniques
CONT

Les sangles sont tissées tubulaires, moussées intérieurement. Le fil utilisé est un 800 deniers polypropylène teint masse. Au moment du tissage, il est possible de personnaliser le produit et d'intégrer des bandes rétro-réfléchissantes [...] pour la sécurité.

Spanish

Save record 1

Record 2 1987-01-19

English

Subject field(s)
  • Aeroindustry
  • Measuring Instruments
  • Lasers and Masers
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].

French

Domaine(s)
  • Constructions aéronautiques
  • Appareils de mesure
  • Masers et lasers
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.

Spanish

Save record 2

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