TERMIUM Plus®

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MICROSCOPE FORCE ATOMIQUE [1 record]

Record 1 2013-07-19

English

Subject field(s)
  • Scientific Instruments
  • Cytology
DEF

A device in which the deflection of a sharp stylus mounted on a soft spring is monitored as the stylus is moved across a surface.

OBS

Unlike the STM, the AFM [Atomic Force Microscope] can scan nonconducting samples. It can do this because it uses optical technology, direct contact, and a laser, to sense the position of the tip in relation to the sample. The tip is very sharp and protrudes from a small flexible cantilever. The laser reflects off the top side of the tip and is directed to a split photodiode. The height of the surface of the sample deflects the cantilever causing the position of the laser on the photodiode to change. The difference in voltage from the photodiode elements provide a "picture" of the surface.

French

Domaine(s)
  • Instruments scientifiques
  • Cytologie
DEF

Microscope où une pointe très fine se déplaçant à la surface de l'échantillon étudié, enregistre, grâce à un dispositif d'asservissement, la force d'interaction de Van der Waals entre la pointe sondeuse et la surface de l'échantillon.

OBS

Le microscope à force atomique est un microscope à palpeur, c'est-à-dire que la sonde est en interaction mécanique (attractive ou répulsive) avec la surface à caractériser.

Spanish

Campo(s) temático(s)
  • Instrumentos científicos
  • Citología
DEF

Microscopio de proximidad basado en la detección de la fuerza que actúa entre la punta del microscopio y una [superficie] metálica o aislante [...] monitorea la superficie de la muestra con una punta de radio de curvatura de 20 a 60 nm [nanómetros] que se localiza al final de un cantilever.

CONT

El microscopio de fuerzas atómicas […] fue inventado en el año 1986 por G. Binning, C. Quate y Ch. Gerber como un instrumento capaz de obtener con gran resolución imágenes de la topografía de una superficie.

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