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Through a “visibility” method identical to MIL-PRF-13830B. “dimensional” method, but ISO drawings may also indicate surface quality ISO 10110-7 refers to specifying surface quality through Ng and Ag as the Surface quality of optics is expressed on drawings as 5/Ng×Ag. The area of the maximum allowed imperfection (Figure 9.2). (Ng) and a grade number (Ag) which is equal to the square root of Numbers, the 10110-7 indicates the number of allowed imperfections Treats both simply as surface imperfections.2 Rather than scratchdig ISO 10110-7 makes no distinction between scratches and digs and instead Is more precise than MIL-PRF-13830B, ISO 10110-7 is more time consuming

ISO 10110-7 is a more quantitativeĪpproach for specifying surface quality based on the physical sizes andįrequencies of surface defects over a given part area. The visual inspection of MIL-PRF-13830B is economical and fast, but Represented with a dig number of 40 and one with a 0.2mm diameter For example, a component with a 0.4mm diameter dig is Quantity: the diameter of the largest component dig, given in 1/100 of The inspection occurs under specifi ed darkfi eld illumination conditions,īut because it is a subjective visual inspection the results can varyįrom inspector to inspector. Scratch brightness with calibrated standard scratch brightness. This number is not anĮxact measurement, only an indication of the best match of component Is one of the following arbitrary numbers: 10, 20, 40, 60, or 80, whereīrightness of scratches increases from 10 to 80. Surface quality using a “scratch” number followed by a “dig” numberīased on calibrated standards prescribed therein.1 The scratch number Military Performance Specifi cation MIL-PRF-13830B describes Specifi cation MIL-PRF-13830B and ISO 10110. Standards for specifying surface quality such as U.S. Wavelengths experience higher amounts of scatter. Tolerances than optics used with visible or IR systems because shorter Optics used with UV wavelengths require tighter surface quality Surface imperfections can be the initiating sites for laser induced damage. More important for laser applications than imaging applications because Imperfections, such as scratches and pits, or digs, which may beĬaused during the manufacturing or handling process. The surface quality of an optical component is an evaluation of the surface