TERMIUM Plus®

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FOUCAULT TESTER [1 record]

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Record 1 2004-02-09

English

Subject field(s)
  • Optics
CONT

A Foucault tester or knife-edge tester is used to measure the radius of curvature of a mirror or sections of a mirror. To focus the light from a star, the primary mirror in a telescope should have the shape of a paraboloid. Foucault realized that a paraboloid mirror could be approximated as a series of concentric rings with slightly different radius of curvatures.

French

Domaine(s)
  • Optique
CONT

On se sert principalement de l'appareil de Foucault pour évaluer la forme d'un miroir et y apporter des correctifs si nécessaire. [...] L'appareil de Foucault permet de diviser un miroir en plusieurs zones et de mesurer celles-ci une à la fois.

Spanish

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