Retardation (R)
the actual distance between two doubly refracted rays as they emerge from an anisotropic fiber; dependent upon the difference in the two refractive indices, |n||n|, and the thickness of the fiber.
Committee
Trace Materials
Date Added to Lexicon
Standard Source (Designation Number Title of Standard. Publisher, Place, Year.)
ANSI/ASTM E2228-23a Standard Guide for Microscopical Examination of Textile Fibers. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, 2023.
Source link
Reprinted, with permission, from ASTM, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, https://www.astm.org