SCRATCH CRATCH & DIG IG - Universal Photonics

1 TECHNICAL DATATECHNICAL DATASSCRATCHCRATCH& D& DIGIGSSURFACEURFACEQQUALITYUALITYSSTANDA RDSTANDARDSNX3002 NX3002 UNIVERSALUNIVERSALPHOTONICSPHOTONICSINCO RPORATEDINCORPORATEDFor more information or to place an order contact us via email or call Photonics INCORPORATED 495 WEST JOHN STREET HICKSVILLE, NY 11801 ::Designed with anodized aluminum housing for cleanroom compatibility and better handling. Ideal for qualitative control and visual identification of SCRATCH and dig surface defects on optical components. Gasketed high efficiency anti-reflective coated windows provide for better durability and visibility. New artifact design improves and accelerates SCRATCH or dig comparison. A new generation of surface quality standards meets the needs of today s optical and accurate evaluation of surface defectshas long presented a problem for quality control managers. Surface quality, dictated by cosmetic specifications for allowable surface defects, is measured in scratches, any long mark or tear, and digs, any pit or divot in the surface.

2 UNIVERSALPHOTONIC SSCRATCH& DIGSETS deliver a standard that remains accurate in varying light levels,angles of view and maintains this accuracy over a long period of time. TECHNICAL DATATECHNICAL DATASSCRATCHCRATCH& D& DIGIGSSURFACEURFACEQQUALITYUALITYSSTANDA RDSTANDARDSNX3002 NX3002 UNIVERSALUNIVERSALPHOTONICSPHOTONICSINCO RPORATEDINCORPORATEDS CRATCH and dig numbers refer to the maximum allowable defect under particular lighting conditions. Thedig number follows the SCRATCH number; for example 60-40 denotes the 60 SCRATCH & 40 dig specification. These surface quality standards are used inquality control departments to qualitatively ensure thatfabricated parts are acceptable. Made in accordance with Army drawing 7641866 Revision R, these standards can be used for visual comparisons as described in MIL-PRF-13830B and MIL-M-13508.

3 Are scribed and digs are etched onto glass window blocks and covered with an anti-reflection coatedwindow and mounted together in a lightweight, compactblack aluminum housing. The individual window blocksare fixed inside their aluminum frame, so they cannot beremoved or misplaced and are sealed from the outside elements. These separate SCRATCH and dig frames areshipped together as a set in one rugged, foam-paddedplastic case for ease of storage and portability. DIGSare certified based on direct measurement using a calibrated microscope. Scratches are certified based on comparison to previously certified SCRATCH sets or direct measurement using the US Army owned Sira microscopeimage comparator. Certificate of Compliance is included with each basic set includes 5 SCRATCHES(numbers 10, 20, 40, 60 and 80) and 5 DIGS(numbers 5, 10, 20, 40, and 50).

4 The evaluation of reflective surfaces is facilitated by the use ofthe half-aluminized set. The 5 scratches in this version are aluminized over half their length and are appropriate for inprocess and final inspection of opaque and mirror surfaces. Because the scratches are only half aluminized,this set can be used for evaluation of both reflective and transmissive optical elements.