Each rainbow band corresponded to the first-order isochromatic fringe and, when monochromatic light was used, each line represented a fringe.
11) In this study, the isochromatic fringe pattern was the result of traction forces that the composite induced on the photoelastic resin, suggesting that the resulting contraction occurred towards the material center, as previously suggested.
Obviously, the number of isochromatic
fringes and therefore the stress level (Eq 5) increases with the flow rate.
6 show the isochromatic
patterns photographed for the two investigated models subjected to compression and torsion respectively.
It has been shown that certain coloured filters change the chromaticity of the hues used in the Farnsworth D15 test in such a way that the set spans a greater number of isochromatic
lines, thus improving the discrimination of those hues.
Colour vision tests exploit isochromatic zones and therefore a change in the spectral properties of the pigment can lead to colours falling away from the confusion lines or a change in the luminance, and the test can become invalid.
Allowing one redgreen isochromatic crossings increased the pass rates to 3% for dichromats and 73% for anomalous trichromats.
As the sample cooled down, the changing stress was measured by counting the isochromatics