In Figures 5-7, the
dominant wavelengths are marked.
The form of regression function of this dependence is L* = exp(-[k.sub.L]d*[x.sub.L]), where [k.sub.L] is the luminance attenuation coefficient, which generally depends on LED colour (
dominant wavelength) and fog type, and [x.sub.L] is the fog layer thickness (2 m in this case).
That is, it has been habitual in the scientific-technological community to consider hue perception as strongly determined by
dominant wavelength (or chromatic angle.
In addition to its inherent value, this information makes obvious that the colourimetric specification of a basic category can not be made only in terms of
dominant wavelength, but must also include lightness and saturation.
The following parameters will be used to perform the colourimetric evaluation:
dominant wavelength ([[lambda].sub.D]), purity (p), reflectance (R), CIEu'v' saturation, and CIEu'v' chroma.
In this approach, the WDM interleaver (WDM IL) is used after the DAM to separate the generated
dominant wavelengths [16].
Recent advances in materials and manufacture have resulted in the commercial availability of light emitting diodes (LEDs) with narrow spectral distributions, high power, and
dominant wavelengths spanning the entire visible spectrum (2).