Unambigous measuring of great retardations with a modified Senarmont method
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.
Document Type: Original Article
Publication date: January 1, 2003