Category : Optics (components, coatings, instruments and systems) > Optical instrumentation, systems and accessories

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Precision flats are generally used for the measurement of surface inaccuracies in other surfaces. Precision flats can detect surface errors up to 0.027µm (0.000001")

Manufactured from Zerodur plates of controlled accuracy, the flat is put into close contact with the surface of another plate and, under monochromatic light, a series of fringes or bands will be visible which will indicate the inaccuracies of the surface being checked. These fringes are produced by the interference of light reflecting from the two contacting surfaces and it is known that the distance between any two fringes represents an error of 0.273µm (0.00001") at 546.1nm (λ/2), so a firm basis for comparison becomes available.

Precision optical flats are versatile devices for measuring surface flatness of polished areas by determining the variations between work surfaces and the surface of the optical flat. Uses include inspecting gauge blocks for wear and accuracy and testing prisms, filters, optical windows etc

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List of all articles in this sub-category Optical instrumentation, systems and accessories

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