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In this paper we deal with the problem of thermal drift when using a LCVR (liquid  crystal variable retarder) Stokes polarimeter. We address this problem in the  restricted case of using a polarimeter to estimate partially linearly polarized  light (that corresponds for example to the reflection of an unpolarized incident  light on manufactured objects). Usually, the three parameters (S0, S1 and S2)  are estimated by observing the reflected light wave, with a CCD sensor, through  the LCVR polarimeter. The accuracy of the Stokes parameters estimate is then  directly related to precise adjustment of the retardation. The problem is that  the retardation introduced by a liquid crystal, variable retarder is strongly  dependent on external factors (i.e. temperature). So, it is almost impossible to  guarantee the reliability of the retardation in time and in practice it is  either necessary to calibrate the LCVR just before carrying out measurement or  use a thermostatic control. So, in this paper we propose a solution that does  not care about the thermal drift of the LCVR to estimate accurately partially  linearly polarized light without thermostatic control

System and method for partial LCVR Stokes polarimeter thermal drift compensation