The invention discloses a
light beam stokes parameter measuring device and a measuring method thereof. The polarization measuring device is composed of a
beam splitter prism group, a phase
retarder array, a polarization analyzer, a photoelectric
detector array and a
signal processing system, wherein all units of the photoelectric
detector array correspond to all units of the phase
retarder array one by one. The measuring method is realized through the following steps: adopting the phase
retarder array to replace the rotational phase retarder; according to the polarization direction of a to-be-measured
light beam, adjusting the direction of a light-transmitting shaft of the polarization analyzer to be parallel to or vertical to the polarization direction of the to-be-measured light; measuring the polarization parameters of the to-be-measured
light beam;
processing data as per
light intensity signals detected by the photoelectric
detector array so as to realize the real-time high accuracy measurement of the light beam
stokes parameters. Though adopting the method, the
stokes parameters of the light beam can be measured in real time, and furthermore, the influences on the measurement accuracy of the light
beam polarization state caused by the phase
delay error of phase delaying devices, the fast-shaft direction error, the direction error of the light-transmitting shaft of the polarization analyzer and the
extinction ratio error are reduced.