We demonstrate a new method for simultaneously .measuring the phase retardation and optic axis' of a compensation film by using an axially-symmetric sheared polymer network liquid crystal (AS-SPNLC). The AS-SPNLC is a liquid crystal structure with radial director distribution and its phase retardation has a gradient change from center to edges. When overlaying a tested compensation film with a calibrated AS-SPNLC cell between crossed polarizers, the optic axis and phase retardation value of the compensation film can be determined. This method is particularly useful for those optical systems whose optic axis and phase retardation are dynamically changing.
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