OPTICAL MEASURING METHOD AND DEVICE FOR MEASURING A MAGNETIC ALTERNATING FIELD WITH AN EXPANDED MEASURING RANGE AND GOOD LINEARITY

摘要

After passing through a Faraday sensor arrangement (3), light (L) to be measured, which is polarized in a linear manner, is divided into two partial light signals (L1, L2) with polarization planes inclined at 45~. A measuring signal (M) which is proportional to the tangent of the Faraday angle of rotation is derived from the two partial light signals.