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An anodized aluminum frame surrounds the standard, protecting the glass from damage and aiding in and handling.An accurate (☐.002mm) linear scale measures scratch length.Grids in each feature set aid in the classification of large or irregular shaped defects in an observed area.Ronchi rulings above each feature set ensure that the measuring system can adequately resolve the features under test.Tolerance: 3-4 l /inch Black Anodized Aluminum 114.3 x 50.8mm ☐.100mm Plate 1: ☐.25µm, Plate 2: ☐.5µm Description 1st Surface, Positive 1st Surface, Negative 2nd Surface, Positive Stock No.
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Scale Length: Scale Divisions: Substrate Material: Thickness: Surface Quality: 60 ☐.002mm every 0.025mm Float Glass 1.5mm nominal 0:0 Inside Active area Flatness: Frame Material: Frame Dimensions: Line Width and Dot Dia. Note: Certificate of Compliance is included with each product. The features on the negative set are clear on an opaque background. The features on the positive set are opaque on a clear background.
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The second surface set has the features marked on the bottom of the glass substrate. The first surface sets have the features marked on the top of the glass substrate. Plate 1 includes grade numbers ranging from 0.004 to 0.040 while Plate 2 includes 0.040 to 0.400. The standards are offered as sets of two plates. The square root of the total defect area for a region is the grade number for that region. The grids can be used to measure the area of irregularly shaped defects. In addition to the Scratch Dig markings, there is a 60mm scale, 6 grids varying in size and 6 blocks of lines with varying frequencies on each plate.
ISO 10110 SCRATCH DIG ISO
ISO 10110-8:2010 Optics and Photonics -Preparation of drawings for optical elements and systems -Part 8: Surface texture roughness and waviness*.ANSI/OEOSC OP1.002-2009 For Optics and Electro-Optical Instru-ments –Optical Elements and Assemblies –Appearance Imperfections*.Governing bodies for rating surface quality are: There are certain surfaces, however, that are more sensitive to these defects such as surfaces at image planes because these defects are in focus and sur-faces that see high power levels because these defects can cause increased absorption of energy and damage the optic. In most cases these defects have little to no adverse effect on the overall system performance in imaging or light gathering applications only small reductions in throughput and small increases in scattered light are typical.
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Technical Note detectors Understanding Surface Quality The surface quality of an optical component is an evaluation of the surface imperfections that may be caused in the manufacturing or handling process.
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