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- Foucault_knife-edge_test abstract "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.It measures mirror surface dimensions by reflecting light into a knife edge at or near the center radius (R) of mirror curvature. In doing so, it only needs a tester which in its most basic 19th century form consists of a light bulb, a piece of tinfoil with a pinhole in it, and a razor blade to create the knife edge. The testing device is adjustable along the X-axis (knife cut direction) across the Y-axis (optical axis), and must have measurable adjustment to 0.001 inch (25 µm) or better along lines parallel to the optical axis. According to Texereau it amplifies mirror surface defects by a factor of one million, making them easily accessible to study and remediation.".
- Foucault_knife-edge_test thumbnail Foucault-Test_1.png?width=300.
- Foucault_knife-edge_test wikiPageExternalLink dall-null.html.
- Foucault_knife-edge_test wikiPageID "29717622".
- Foucault_knife-edge_test wikiPageLength "7824".
- Foucault_knife-edge_test wikiPageOutDegree "36".
- Foucault_knife-edge_test wikiPageRevisionID "679137302".
- Foucault_knife-edge_test wikiPageWikiLink Airy_disk.
- Foucault_knife-edge_test wikiPageWikiLink Amateur_telescope_making.
- Foucault_knife-edge_test wikiPageWikiLink André_Couder.
- Foucault_knife-edge_test wikiPageWikiLink Angular_resolution.
- Foucault_knife-edge_test wikiPageWikiLink Category:Amateur_astronomy.
- Foucault_knife-edge_test wikiPageWikiLink Category:Measuring_instruments.
- Foucault_knife-edge_test wikiPageWikiLink Category:Mirrors.
- Foucault_knife-edge_test wikiPageWikiLink Category:Optical_devices.
- Foucault_knife-edge_test wikiPageWikiLink Category:Telescopes.
- Foucault_knife-edge_test wikiPageWikiLink Caustic_test.
- Foucault_knife-edge_test wikiPageWikiLink Diffraction-limited_system.
- Foucault_knife-edge_test wikiPageWikiLink Diffraction_grating.
- Foucault_knife-edge_test wikiPageWikiLink Electric_light.
- Foucault_knife-edge_test wikiPageWikiLink F-number.
- Foucault_knife-edge_test wikiPageWikiLink Fabrication_and_testing_of_optical_components.
- Foucault_knife-edge_test wikiPageWikiLink Figuring.
- Foucault_knife-edge_test wikiPageWikiLink Fizeau_interferometer.
- Foucault_knife-edge_test wikiPageWikiLink Huygens–Fresnel_principle.
- Foucault_knife-edge_test wikiPageWikiLink Inch.
- Foucault_knife-edge_test wikiPageWikiLink Interferometry.
- Foucault_knife-edge_test wikiPageWikiLink Knife-edge_effect.
- Foucault_knife-edge_test wikiPageWikiLink Léon_Foucault.
- Foucault_knife-edge_test wikiPageWikiLink Michelson_interferometer.
- Foucault_knife-edge_test wikiPageWikiLink Nanometre.
- Foucault_knife-edge_test wikiPageWikiLink Null_corrector.
- Foucault_knife-edge_test wikiPageWikiLink Optical_axis.
- Foucault_knife-edge_test wikiPageWikiLink Parabola.
- Foucault_knife-edge_test wikiPageWikiLink Primary_mirror.
- Foucault_knife-edge_test wikiPageWikiLink Strehl_ratio.
- Foucault_knife-edge_test wikiPageWikiLink Twyman–Green_interferometer.
- Foucault_knife-edge_test wikiPageWikiLink Wavelength.
- Foucault_knife-edge_test wikiPageWikiLink Ångström.
- Foucault_knife-edge_test wikiPageWikiLink File:Foucault-Test_1.png.
- Foucault_knife-edge_test wikiPageWikiLink File:Foucault-Test_2_rotated.jpg.
- Foucault_knife-edge_test wikiPageWikiLinkText "Foucault knife-edge test".
- Foucault_knife-edge_test wikiPageWikiLinkText "Foucault testable".
- Foucault_knife-edge_test wikiPageUsesTemplate Template:Cite_book.
- Foucault_knife-edge_test wikiPageUsesTemplate Template:Main.
- Foucault_knife-edge_test wikiPageUsesTemplate Template:Reflist.
- Foucault_knife-edge_test subject Category:Amateur_astronomy.
- Foucault_knife-edge_test subject Category:Measuring_instruments.
- Foucault_knife-edge_test subject Category:Mirrors.
- Foucault_knife-edge_test subject Category:Optical_devices.
- Foucault_knife-edge_test subject Category:Telescopes.
- Foucault_knife-edge_test type Instrument.
- Foucault_knife-edge_test type Application.
- Foucault_knife-edge_test type Instrument.
- Foucault_knife-edge_test type Tool.
- Foucault_knife-edge_test comment "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.".
- Foucault_knife-edge_test label "Foucault knife-edge test".
- Foucault_knife-edge_test sameAs Q1439729.
- Foucault_knife-edge_test sameAs Foucaultsches_Schneidenverfahren.
- Foucault_knife-edge_test sameAs Test_de_Foucault.
- Foucault_knife-edge_test sameAs Metoda_cieniowa_Foucaulta.
- Foucault_knife-edge_test sameAs Teste_de_Foucault.
- Foucault_knife-edge_test sameAs m.0fp_72t.
- Foucault_knife-edge_test sameAs Q1439729.
- Foucault_knife-edge_test wasDerivedFrom Foucault_knife-edge_test?oldid=679137302.
- Foucault_knife-edge_test depiction Foucault-Test_1.png.
- Foucault_knife-edge_test isPrimaryTopicOf Foucault_knife-edge_test.
