A new scatterometer–polarimeter is described. It measures the
angular distribution of intensity and of the complete Mueller matrix of light
scattered by rough surfaces and particle suspensions. The measurement time is
1 s/scattering angle in the present configuration but can be reduced to a
few milliseconds with modified electronics. The instrument uses polarization
modulation and a Fourier analysis of four detected signals to obtain the 16
Mueller matrix elements. This method is particularly well suited to online,
real time, industrial process control involving rough surfaces and large
particle suspensions (an arithmetic roughness or particle diameter of >1 µm). Some results are given.
© 1997 Optical Society of America
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