Method and apparatus for measuring an electromagnetic radiation response characteristics related to the (210) substrate, to calibrate the electromagnetic measuring device (100) is disclosed. Apparatus and method, a second electromagnetic wave to generate an electromagnetic wave, is generated through the first polarization filter, is reflected in the substrate and disposed arrangement poles intersects to the polarization filter of the first After passing through a polarizing filter, to capture a portion of the electromagnetic wave. In addition, the device captures the electromagnetic waves reflecting in standard calibration of one or more passes through the filter attenuation. Digital data is determined from the electromagnetic wave that has been captured. Device is re-calibrated using the digital data.
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