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Unambigous measuring of great retardations with a modified Senarmont method

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Abstract:



Tiltable compensators are often used for measuring of great retardations of media with birefringence. In case false colours do appear a destruction-free measuring would not be possible with this method. That is why we present a multi-colour or multi-Senarmont-method basing on a simultaneous or sucsessive measuring of the Senarmont-angle with two or more wavelengths and a subsequent minimization calculation. Two principal advantages will result:

1. Retardations Γ > λ will be measured unambigously. 2. Samples with false colours will be also measured without any destruction and unambigously. Important condition: The difference of the measuring-wavelengths can amount to at most 10 nm. Further advantages of the multicolour-Senarmont-method (opportunities for automatic contactless and short-period measuring [minimal integration time]) will be published later.

Keywords: Polarization; birefringence; false colours; multicolour-Senarmont-method; retardation

Document Type: Original Article

DOI: http://dx.doi.org/10.1078/0030-4026-00194

Affiliations: 1: Thüringisches Institut für Textil- und Kunststoff-Forschung, 07407 Rudolstadt, Germany 2: Fraunhofer Institut für Angewandte Optik und Feinmechanik IOF, 07745 Jena, Germany

Publication date: January 1, 2003

urban/361/2003/00000113/00000011/art00194
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