b) Photographs experimentally taken utilizing dynamic photoelasticity in conjunction with high-speed cinematography show the time-dependent
isochromatic fringe patterns (distributions of [[tau].
0]) were obtained from the
isochromatic ring diameters using the following equation:
Because of the use of white light, the
isochromatic fringe pattern appeared as a series of colored bands (Fig.
The H-W Type A displays specified signal colours, approved by the CIE, but the FALANT displays red, yellow-green and yellowish-white lights that have x, y chromaticity co-ordinates within a common protan/deutan
isochromatic zone.
Under polarized light, flow induced molecular anisotropy produces multiple retardation orders of the
isochromatic fringes, which are related to the birefrmngence as:
Thresholds that define red-green (RG) and blue-yellow (BY) sensitivity, within the neutral
isochromatic zone, are plotted as x, y chromaticity co-ordinates in the CIE chromaticity diagram (1931).
Figure 4 shows the
isochromatic patterns photographed for the model subjected to force [P.
Colour confusions are specified in
isochromatic zones in the reference system approved by the Commission Internationale d'Eclairage (CIE) in 1931.
