Mathematical Model of the One-stage Magneto-optical Sensor Based on Faraday Effect

The aim of this work is to refine a model of magneto-optical sensors based on Faraday's longitudinal magneto-optical effect. The tasks of the study include computer modeling and analysis of the transfer characteristic of a single-stage magneto-optical sensor for various polarization of the input beam and non-ideal optical components. The proposed mathematical model and software make it possible to take into account the non-ideal characteristics of film polaroids observed in operation in the near infrared region and at increased temperatures. On the basis of the results of the model analysis it was found that the dependence of normalized transmission T(γ₂) has periodic nature. Choosing the angle (γ ₂−γ ₁) makes it possible to shift the initial operation point and change the sensitivity dT/dγ ₂. The influence of the input beam polarization increases with the increase of polaroid parameter deviation from ideal and shows itself as reduction of modulation depth and angular shift of the sensor conversion response. (paper)