| Autor: |
Marek Andrzej Kojdecki, Emilia Miszczyk, Jerzy Kedzierski, Przemysław Morawiak, Wiktor Piecek, Jerzy Zielinski, Zbigniew Raszewski, E. Kruszelnicki-Nowinowski, K. Ogrodnik, Paweł Perkowski |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
Opto-Electronics Review. 18 |
| ISSN: |
1896-3757 |
| DOI: |
10.2478/s11772-010-0009-8 |
| Popis: |
A new accurate and fast interference method for determining ordinary and extraordinary refractive indices of nematic liquid crystals is presented and discussed. The method relies on microscopic measurements of distances between interference fringes appearing in polarised parallel coherent monochromatic light beam transmitted normally to the surfaces through a wedge cell filled with a nematic. Both glass plates confining the cell are coated with a partly transparent thin film of metal which is deposited by evaporation in vacuum. Owing to the multiple reflections between the surfaces and a small edge angle, the interference fringes observed near the wedge apex edge are sharp and equidistant. To apply this method one needs only small amount of an investigated liquid crystal. Basic mathematical formulae and results of an experiment are briefly discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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