Determination of the characteristics of the surface of objects at optical remote sensing by the polarization-holographic imaging Stokes spectropolarimeter

Abstract

The Polarization-Holographic Imaging Stokes Spectro-Polarimeter developed by us is proposed to use for the determination of the characteristics of the surface of objects at optical remote sensing. Only one integral polarizationholographic element is used in such a spectropolarimeter as an analyzing detail, which makes real time complete analysis of the polarization state of light (determination of all the four Stokes parameters) possible, as well as the determination of the distribution of the polarization state of light in the image of recognizable object and the dispersion of this distribution, which provides additional information while identifying an object. A theoretical model showing the connection of the Stokes parameters of light reflected from a recognizable object with the characteristics of the material of the reflecting surface of the object has been developed that allows the appropriate correlation connections to be set. Experimentally the possibility of obtaining the distribution of the values of the Stokes parameters is shown for the samples from different materials and of a different geometric form.

A new real-time polarimetric method for determining the distribution of stressed state in different constructions

“…Therefore, we assume that the surface of an object with stress state can be described by the Jones matrix 14 of an anisotropic reflecting surface which consists of refraction index and absorbance of the materials (birefringence). Such a matrix was obtained in 15 . In this case we use the complex refractive index τ in n n − = in the Fresnel equations ( n is refractive index and τ -the extinction coefficient), then the reflection from the media which absorb radiation can be described by them.…”

“…The following expression was obtained for the Jones matrix of the anisotropic reflective surface 15 . were determined for the dependence of the reflected field on the direction of the reflected beam.…”

“…In this case we use the complex refractive index τ in n n − = in the Fresnel equations ( n is refractive index and τ -the extinction coefficient), then the reflection from the media which absorb radiation can be described by them. 15 The Fresnel formulas for the media with a complex refractive index connect amplitudes of the incident and reflected waves:…”

“…Such an element was created by means of polarization-holographic method 15 , when several polarization-holographic gratings with different profile of the anisotropy and gyrotropy in the band (gratings C , 90 L , 45 L ) are recorded on one and the same area of polarization-sensitive material, so that the diffracted beams have been spatially separated. [10][11][12] We use polarization-sensitive materials for recording polarization-holographic gratings and elements on their basis.…”