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Optical sensor arrangement and method for measuring an observable

 
: Heidrich, Helmut; Lützow, Peter; Pergande, D.

:
Frontpage ()

EP 0075212 : 20110919
Deutsch
Patent, Elektronische Publikation
Fraunhofer HHI ()

Abstract
The invention relates to an optical sensor arrangement (1; 10; 40; 60) for measuring an observable comprising: at least one light source (2; 11, 12; 41, 42; 62, 63, 64) for generating a first light component of a first frequency comprising a first mode and a second light component of a second frequency comprising a second mode orthogonal to said first mode; an optical resonator (4; 17; 45; 69) having differing optical lengths for the first and second modes, at least one of the optical lengths being variable depending on the observable and a dependence of the respective optical length being different for said first and second modes, wherein the at least one light source is optically coupled to the optical resonator for feeding the two light components into the optical resonator; and a detector unit (6; 23 52; 74) being coupled to the optical resonator for coupling out the two light components and being configured for detecting a frequency difference between a resonance frequency of the optical resonator for the first mode and a resonance frequency of the optical resonator for the second mode. Furthermore, the invention relates to a method for measuring an observable by means of an optical sensor arrangement (1; 10; 40; 60) of this kind.

: http://publica.fraunhofer.de/dokumente/N-270800.html