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  2. Epstein frame - Wikipedia

    en.wikipedia.org/wiki/Epstein_frame

    The International Standard for the measurement configuration and conditions are defined by the standard IEC 60404-2:2008 Magnetic materials - Part 2: Methods of measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame [1] published by International Electrotechnical Commission.

  3. Help:Printing - Wikipedia

    en.wikipedia.org/wiki/Help:Printing

    This page in a nutshell: To print a Wikipedia page, select File → Print from your web browser, or click on the browser print icon. In general, printing a Wikipedia article is as simple as selecting Printable version from the tools menu on the sidebar or at the top-right.

  4. First-surface mirror - Wikipedia

    en.wikipedia.org/wiki/First-surface_mirror

    A first-surface mirror or front-surface mirror (also commonly abbreviated FS mirror or FSM) is a mirror with the reflective surface being above a backing, as opposed to the conventional, second-surface mirror with the reflective surface behind a transparent substrate such as glass or acrylic.

  5. Null corrector - Wikipedia

    en.wikipedia.org/wiki/Null_corrector

    Adding a null corrector so the interferometer test can measure an aspheric mirror. The null corrector cancels the non-spherical portion of the mirror figure, so when viewed from point A, the combination looks precisely spherical if the mirror under test has the correct figure. Diagram is not to scale – the null corrector is much smaller than ...

  6. Ronchi test - Wikipedia

    en.wikipedia.org/wiki/Ronchi_test

    The observer's eye is placed close to the centre of curvature of the mirror under test looking at the mirror through the grating. The Ronchi grating is a short distance (less than 2 cm) closer to the mirror. [citation needed] The observer sees the mirror covered in a pattern of stripes that reveal the shape of the mirror.

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  8. Foucault knife-edge test - Wikipedia

    en.wikipedia.org/wiki/Foucault_knife-edge_test

    Foucault test setup to measure a mirror. The Foucault knife-edge test is an optical test to accurately measure the shape of concave curved mirrors. It is commonly used by amateur telescope makers for figuring primary mirrors in reflecting telescopes. It uses a relatively simple, inexpensive apparatus compared to other testing techniques.

  9. Corner reflector - Wikipedia

    en.wikipedia.org/wiki/Corner_reflector

    The three intersecting surfaces often are triangles (forming a tetrahedron) or may have square shapes. Radar corner reflectors made of metal are used to reflect radio waves from radar sets. Optical corner reflectors, called corner cubes or cube corners , made of three-sided glass prisms , are used in surveying and laser ranging .

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