Nondestructive optical testing of the materials surface structure based on liquid crystals

M. G. Tomilin; S. K. Stafeev

doi:10.1117/12.900314

2 November 2011 Nondestructive optical testing of the materials surface structure based on liquid crystals

M. G. Tomilin, S. K. Stafeev

Proceedings Volume 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World; 80116P (2011) https://doi.org/10.1117/12.900314
Event: International Commission for Optics (ICO 22), 2011, Puebla, Mexico

Abstract

Thin layers of nematic liquid crystals (NLCs) may be used as recording media for visualizing structural and microrelief defects, distribution of low power physical fields and modifications of the surface. NLCs are more sensitive in comparison with cholesteric and smectic LCs having super molecular structures. The detecting properties of NLCs are based on local layers deformation, induced by surface fields and observed in polarizing microscope. The structural surface defects or physical field's distribution are dramatically change the distribution of surface tension. Surface defects recording becomes possible if NLC deformed structure is illuminated in transparent or reflective modes and observed in optical polarizing microscope and appearing image is compared with background structure. In this case one observes not the real defect but the local deformation in NLCs. The theory was developed to find out the real size of defects. The resolution of NLC layer is more than 2000 lines/mm. The fields of NLC application are solid crystals symmetry, minerals, metals, semiconductors, polymers and glasses structure inhomogeneities and optical coatings defects detecting. The efficiency of NLC method in biophotonics is illustrated by objective detecting cancer tissues character and visualizing the interaction traces of grippe viruses with antibodies. NLCs may detect solvent components structure in tea, wine and perfume giving unique information of their structure. It presents diagnostic information alternative to dyes and fluorescence methods. For the first time the structures of some juices and beverages are visualized to illustrate the unique possibilities of NLCs.

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M. G. Tomilin and S. K. Stafeev "Nondestructive optical testing of the materials surface structure based on liquid crystals", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80116P (2 November 2011); https://doi.org/10.1117/12.900314

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KEYWORDS

Visualization

Solids

Liquid crystals

Crystals

Magnetism

Microscopes

Nondestructive evaluation

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