Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Unambigous measuring of great retardations with a modified Senarmont method

 
: Kaufmann, S.; Zeitner, U.

:

Optik 113 (2002), Nr.11, S.476-480
ISSN: 0030-4026
Englisch
Zeitschriftenaufsatz
Fraunhofer IOF ()

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 Gamma > lambda 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.

: http://publica.fraunhofer.de/dokumente/N-37141.html