By making use of the findings that the spectral analysis of light in t
he region of superposition in Young's interference experiment provides
information about the spectral correlation properties of the radiated
fields, experimental studies are conducted on the determination of th
e degree of spectral measurements over a range of frequencies in the f
ar zone of a broadband, planar, secondary, quasi-homogenous (PSQh) sou
rce and the results are reported.