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Iso 10110 scratch dig10/30/2022 ![]() The MIL standard format follows a scratch number approach, followed by a dig number based on calibrated standards. ![]() A 100-W fluorescent lamp is often used to enhance the visibility of any defects, while a more detailed comparison to the standard is performed using a 40-W lamp. When measuring to the MIL specification, an optic’s surface is visually compared to a calibrated standard. #Iso 10110 scratch dig iso#Military Performance Specification MIL-PRF-13830B and the European-originated ISO 10110. Over the years, however, two commonly accepted standards have emerged to try to bring clarity to the industry: the U.S. Since the possible permutations of type, magnitude, and number of surface defects is so vast, no single overarching standard can specify the quality of an optical surface. “A super-polished window with a surface roughness less than 1 angstrom may be needed for a precise, high-power laser materials processing system in order to minimize scatter, but the same window would be drastic overkill as a protective window in a low-power light projection system,” Boone said. However, in lower-power laser applications, surface roughness may have a negligible effect on performance, and maintaining a tight roughness specification will unnecessarily increase cost. “ surface roughness may also be important for minimizing scatter, as high-power laser light scattering through a system could be dangerous.” “For high-power laser systems, the smallest amount of contamination could lead to laser-induced damage, reducing performance and possibly even leading to system failure,” said Cory Boone, lead technical marketing engineer at Edmund Optics. Laser applications, for example, can have a particularly low threshold for surface flaws. Inspecting surface quality following the MIL-PRF-13830B specification involves performing a visual inspection and comparing the surface to a calibrated standard to characterize the level of visible defects. Any scratch, dig, chip, stain, bubble, or discoloration could compromise the performance of the optical system and affect the application for which it was designed. Imperfections can arise during manufacturing, when surfaces are exposed to the environment prior to packaging, or when an optic is in transit. #Iso 10110 scratch dig free#No optical surface is entirely free of defects. The types of imperfections that customers need to look out for vary widely depending on the application. The crucial factor to keep in mind is the acceptable number, type, and severity of defects. Often, scratches and digs have little impact on the actual performance of an optical system but are instead indicative of the care and workmanship of the optical fabrication. Imperfections can arise during manufacturing, when surfaces are exposed to the environment prior to packaging, or even when an optic is in transit. In concept, optical surfaces are idealized perfect shapes, although in the real world no surface can be made without blemish. In addition to the human eye, a range of optical equipment is used for close inspection of optical surface texture, including large-aperture interferometers, white-light interferometers, and atomic force microscopes. In the end, though, establishing the correct specification comes down to determining whether and how surface defects may affect the optical system and its intended use. Optical inspections utilize a host of techniques to reveal surface details that are difficult or impossible to be seen with the naked eye, and these techniques give rise to a wide array of specifications with equally numerous and confusing terminology. ![]() Humans have yet to be usurped by automation, in this niche at least, but automated inspection could become an increasingly useful option if current trends continue. It may come as a surprise to learn that, in sharp contrast to the high-precision practices of the optics industry, many optical surfaces are still inspected by the naked eye. ![]() Defects matter when it comes to optical surfaces, but knowing what types of flaws are acceptable requires a combination of surface inspection and close communication between supplier and user. ![]()
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