Polarization gas sensor for sulfur dioxide

The design principle of a compact gas polarization sensor is described. It was shown that a sensor for sulfur dioxide can be prepared on the basis of polysiloxane layers modified with alkyl amines. To exclude the effect of moisture on the sensor indications, the signal from the sensing element under total reflection conditions at the film-prism interface was measured. The detection limit for sulfur dioxide under these conditions was about 1-2 mg/m(3).