Polarimetry

The polarimetry is the Science measurement of the polarization of the Lumière. A Polarimètre is used with this intention. The polarimetry of the thin films and the Surface S is known under the name of Ellipsométrie.

Polarimetry can be used to determine a great number of Propriété S of an object, among which one can find birefringence circular (or rotatory Pouvoir), linear birefringence, and dichroism (circular or linear).

To measure the polarization of the light, the most modern instruments call upon the Interférométrie whereas the majority call upon polarizing filters.

Measure optical rotation

Optically active samples, as the solutions of chiral molecules often have a circular birefringence which causes the rotation of the plan of polarization of the light when it crosses the sample.

A simple Polarimeter to measure rotation is made of a long tube closed at an end by flat glass, inside which the sample is placed. One places a Prisme of Nicol at each end of the tube. One then makes pass the light in the tube. One then makes turn one of the prisms until all the light is blocked. There is immediately the angle of polarization of the sample.

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