fringe value

fringe value

[′frinj ‚val·yü]
(optics)
A quantity used in photoelastic work, equal to the stress which must be applied to a material, in pounds per square inch (1 pound per square inch equals approximately 6.89476 kilopascals), to produce a relative retardation of 1 wavelength between the components of a linearly polarized light beam when the light passes through a thickness of 1 inch (2.54 centimeters) in a direction perpendicular to the stress.
References in periodicals archive ?
1 mm, fringe value of coating f = 915 [micro]m/m per fringe, strain optical coefficient of coating K = 0.