A method for controlling the production of an object controlled by a gas panel,
by performing an ellipsometric measurement on the object represented by its Mueller
matrix; controlling, with a gas panel, the manufacture on the basis of the ellipsometric
measurement. Certain parameters of the Mueller matrix are determined in advance,
for characterizing the manufacture, and only these parameters are extracted from
the ellipsometric measurement during manufacture, the parameters being two different
parameters of the ellipsometric angles and and trigonometric functions thereof.
