ISSN:
1741-2765
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Several investigators have observed that birefringence depends upon the color of light used in its measurement. That is to say, the order of isochromatic is not simply inversely proportional to the wavelength. This dependence of the absolute and relative retardation, and consequently of the photoelastic coefficients upon wavelength, is called dispersion of birefringence. In this paper, the authors discuss previous reports and formulations of optical dispersion and dispersion of birefringence. These past descriptions, which are partially arbitrary, are thought to be inadequate in view of progress in photoelasticity, spectroscopy, polymer physics and, in particular, the extension of photoelastic methods into the longwave spectral regions. New measures of dispersion are presented, and their relationships to each other and to other quantities, especially the stress- and strain-optical coefficients, are discussed. The authors present dispersion measurements derived from tests of CR-39 and P-6 in a spectral region consisting of the visible and near infrared. Some results indicate that the association between dispersion of birefringence and linear limit stress may constitute the basis for less ambiguous definitions of the linear range and for the establishment of general analytical expressions which are more closely related to real physical behavior.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02326561
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