Abstract. The attenuated total internal reflection (ATIR) is an area of constant interest. The reason for that is the great variety of useful applications based on this phenomenon. In this paper we describe a simple interferometric phasemeter which can be used to control the presence of absorption in water solutions. In the process of the attenuation of the total internal reflection in a three layer system the phase shift between both main polarization components of the reflected field is strongly dependent on the complex value of the index of refraction of the second media. This method is based on the interferometric restoration of both p- and s-components of the resultant field. The resulting interferometrical signal is modeled theoretically and studied experimentally.

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