Foucault knife-edge test

From top: Parabolic mirror showing Foucault shadow patterns made by knife edge inside radius of curvature R (red X), at R and outside R.

The Foucault knife-edge test was described in 1858 by French physicist Léon Foucault to measure conic shapes of optical mirrors, with error margins measurable in fractions of wavelengths of light (or Angstroms, millionths of an inch, or nanometers). It is commonly used by amateur telescope makers for figuring small astronomical mirrors. Its relatively simple, inexpensive apparatus can produce measurements more cost-effectively than most other testing techniques.

单词	Foucault Knife Edge Test
释义	Foucault Knife Edge Test 英语百科 Foucault knife-edge test The Foucault knife-edge test was described in 1858 by French physicist Léon Foucault to measure conic shapes of optical mirrors, with error margins measurable in fractions of wavelengths of light (or Angstroms, millionths of an inch, or nanometers). It is commonly used by amateur telescope makers for figuring small astronomical mirrors. Its relatively simple, inexpensive apparatus can produce measurements more cost-effectively than most other testing techniques.
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Foucault Knife Edge Test

Foucault knife-edge test