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An imaging polarimeter for spectroscopic full-Stokes parameters by dual rotating retarder and analyzer is proposed for flaw detection.It is possible to calibrate for wavelength dependence of its retarder by choosing Fourier coefficient.It is succeeded to measure the state of polarization of a sample from reflected light,scattered light and transmitted light from any angle.It is applied to a flaw inspection on an arm type robot with six-degree of freedom.