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INPUT RESONATOR [3 records]

Record 1 2017-01-13

English

Subject field(s)
  • Applications of Electronics
  • Measuring Instruments (Engineering)
  • Navigation Instruments
CONT

CVGs [Coriolis vibrating gyroscope] have three features in common : a mechanical resonator, an oscillator and a force-displacement sensor. One mode of the resonator is maintained in resonance by an oscillator loop while oscillations are induced in a second vibration mode. The amplitude of the oscillations gives a signal proportional to the input angular rate. A wide variety of resonators, actuation and sensing schemes are possible. The simplest resonator is a tuning fork.

CONT

... the following characteristics can be those of a rate gyro designed to measure a rate of turn up to 100 DEG per second. The mechanical resonator comprises four beams each having a cross-section of 6 mm by 6 mm, and each 30-35 mm long. The piezo-electric elements are constituted by pellets of PZT having a thickness of a few tenths of a millimeter, metal-coated on both faces, and bonded to the beams.

French

Domaine(s)
  • Applications de l'électronique
  • Instruments de mesure (Ingénierie)
  • Instruments de navigation
CONT

En gyroscopie mécanique [...] on sait que le plan d'oscillation d'un pendule (on parlera plus loin d'un résonateur mécanique), ou l'axe d'une toupie en rotation rapide ont la propriété de conserver une direction fixe dans l'espace inertiel. [...] Mais, l'inertialité parfaite du pendule de Foucault est liée à la simplicité du résonateur et aux particularités de sa mise en œuvre. Aussi, dans les résonateurs mécaniques utilisés pour la fabrication des gyroscopes, la vibration mécanique est partiellement entraînée lors de la rotation du support mécanique.

Spanish

Save record 1

Record 2 1985-03-29

English

Subject field(s)
  • Lasers and Masers
OBS

Laser : An active electron device that converts input power into a very narrow, intense beam of coherent visible or infrared light; the input power excites the atoms of an optical resonator to a higher energy level, and the resonator forces the excited atoms to radiate in phase. Derived from light amplification by stimulated emission of radiation.

French

Domaine(s)
  • Masers et lasers
OBS

L'irradiation laser sur les milieux biologiques a deux conséquences : des effets thermiques (une très forte chaleur est dégagée au point d'impact), les mieux connus, et des effets non thermiques encore imparfaitement connus. D'une façon générale, ce sont les premiers qui sont employés en médecine.

OBS

Il semble qu'à côté de l'effet purement thermique du laser, des effets peuvent se manifester sur les grosses molécules et les enzymes de la matière vivante (effets chimiques).

Spanish

Save record 2

Record 3 1976-06-19

English

Subject field(s)
  • Vacuum Tubes (Electronics)

French

Domaine(s)
  • Tubes et lampes (Électronique)

Spanish

Save record 3

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