288
3 Holographic Interferometry for Studying …
Cross of Saint Euphrosyne was given to the Saviour Cathedral of Polotsk. The Cross
keeps a piece of the True Cross with a drop of the Blood of Christ, a piece of the
Holy Sepulcher and the Sepulcher of the Most Holy Mother of God, a drop of the
blood of Dmitry of Solun, great martyr, a piece of relics of Saint Stephan and Saint
Panteleimon.
This picture hologram “The Cross of Saint Euphrosyne of Polotsk” is an achievement in the world practice of large-size hologram recording and gives the possibility
to preserve 3D image of the Cross protecting it from unexpected circumstances and
to see the image of the shrine to a greater number of people.
Experiments on recording and forming of combined 3D and plane image of the
reproduced image of the Cross of Saint Euphrosyne of Polotsk are continued [297].
3.5 Results and Conclusions
1. A number of methods were theoretically developed to determine absolute surface
relief, which have a prior character. It was established that implementation of
absorbing media in holographic contouring methods gives the possibility to modulate
the contrast of the interference pattern. The maximal contrast fringe is interpreted
as a zeroth order fringe; other contours are numerated in the order of their visibility
decrease.
There were developed the resonance contouring method, which enhances the
spatial resolution in 1.3 times, and the holographic method of surface relief study,
which gives the possibility to register objects of a double depth through matching
light amplitudes in reference waves with absorption coefficients of the immersion
medium.
A multi-angle method was theoretically proved and experimentally tested, which
consisted in obtaining of contoured maps while illuminating it with M beams simultaneously, which are located at an equal distance along the angle. It allows narrowing
the interferences maxima in 3.5 times at the expense of multi-beam interferometry
and thus enhancing the accuracy of identifying their location on the surface of the
object. As a result of the conducted optimization of interferogram registration conditions, it was shown that if in the experiment the product of time of one exposition and
their number stays the same, this significantly enhances the diffraction efficiency of
multi-exposure holograms. This gave the possibility to obtain contoured maps of the
human skull with half as narrow interference contours.
There were conducted theoretical studies of holographic interferograms forming
processes taking into account the polarization characteristics of the interfering waves.
A possibility was shown to control the holographic topograms contrast through
impact on corresponding polarization components of the object waves. On the
grounds of the conducted study, the holographic contouring method was developed,
which is based on partition of polarization state of object beams by using optically
active media. The contouring method was developed, which does not require usage
3 Holographic Interferometry for Studying …
Cross of Saint Euphrosyne was given to the Saviour Cathedral of Polotsk. The Cross
keeps a piece of the True Cross with a drop of the Blood of Christ, a piece of the
Holy Sepulcher and the Sepulcher of the Most Holy Mother of God, a drop of the
blood of Dmitry of Solun, great martyr, a piece of relics of Saint Stephan and Saint
Panteleimon.
This picture hologram “The Cross of Saint Euphrosyne of Polotsk” is an achievement in the world practice of large-size hologram recording and gives the possibility
to preserve 3D image of the Cross protecting it from unexpected circumstances and
to see the image of the shrine to a greater number of people.
Experiments on recording and forming of combined 3D and plane image of the
reproduced image of the Cross of Saint Euphrosyne of Polotsk are continued [297].
3.5 Results and Conclusions
1. A number of methods were theoretically developed to determine absolute surface
relief, which have a prior character. It was established that implementation of
absorbing media in holographic contouring methods gives the possibility to modulate
the contrast of the interference pattern. The maximal contrast fringe is interpreted
as a zeroth order fringe; other contours are numerated in the order of their visibility
decrease.
There were developed the resonance contouring method, which enhances the
spatial resolution in 1.3 times, and the holographic method of surface relief study,
which gives the possibility to register objects of a double depth through matching
light amplitudes in reference waves with absorption coefficients of the immersion
medium.
A multi-angle method was theoretically proved and experimentally tested, which
consisted in obtaining of contoured maps while illuminating it with M beams simultaneously, which are located at an equal distance along the angle. It allows narrowing
the interferences maxima in 3.5 times at the expense of multi-beam interferometry
and thus enhancing the accuracy of identifying their location on the surface of the
object. As a result of the conducted optimization of interferogram registration conditions, it was shown that if in the experiment the product of time of one exposition and
their number stays the same, this significantly enhances the diffraction efficiency of
multi-exposure holograms. This gave the possibility to obtain contoured maps of the
human skull with half as narrow interference contours.
There were conducted theoretical studies of holographic interferograms forming
processes taking into account the polarization characteristics of the interfering waves.
A possibility was shown to control the holographic topograms contrast through
impact on corresponding polarization components of the object waves. On the
grounds of the conducted study, the holographic contouring method was developed,
which is based on partition of polarization state of object beams by using optically
active media. The contouring method was developed, which does not require usage