20 December 1989 The Scratch Standard Is Only A Cosmetic Standard
Author Affiliations +
In this paper, I present a history of the scratch-and-dig standard for optical surface quality and show that this standard has since its inception been recognized as a cosmetic standard and not as an objective or performance standard. In addition, I attempt to dispel the myth that the scratch standard was changed during the 1960's and show that scratch number cannot be related to scratch width. Finally, I describe a preliminary aging experiment that suggests that the scratch standards have not aged with time and are, in fact, extremely stable.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matt Young, "The Scratch Standard Is Only A Cosmetic Standard", Proc. SPIE 1164, Surface Characterization and Testing II, (20 December 1989); doi: 10.1117/12.962822; https://doi.org/10.1117/12.962822


Industrial Color Inspection
Proceedings of SPIE (October 23 1986)
Virtual image superposing comparator
Proceedings of SPIE (May 28 1993)
Tunable Scratch Standards
Proceedings of SPIE (September 03 1985)

Back to Top