Therefore this documentary standard Is directly linked to physical standards. For surface imperfections in optics, dig and scratch standards were described in Military Specification MIL-O-13830A (1963) and related Drawing C7641866. Numerous standards have been produced by these organizations relating to surface finish specification, and surface profiling and scattering measurements. ![]() For surface finish, standards development organizations Include the American Society of Mechanical Engineers (ASME) Committee B46 on the Classification and Designation of Surface Qualities, the International Organization for Standardization (ISO) Technical Committee (TC) 213 on Dimensional and Geometrical Product Specifications and Verification, ISO TC172 on Optics and Optical Instruments, and the American Society for Testing and Materials (ASTM). ![]() We discuss here documentary standards for surface finish and both documentary and physical standards for surface imperfections. "Imperfections" is a general term to describe localized defects that mar the surface appearance and also cause stray light. ![]() Surface finish or surface roughness constitutes the numerous fine irregularities that cause scattering and stray light in optical systems. ![]() Surface finish and imperfections are important properties of optical surfaces because they are caused by manufacturing limitations or defects and are linked to degradation of optical performance.
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