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Title
Integriert-optischer Sensor
Date Issued
1993
Author(s)
Hinkov, V.
Hinkov, I.
Patent No
1991-4138221
Abstract
The invention relates to an integrated optical sensor for the absolute determination of refractive index, comprising a substrate made of lithium niobate in which a monomode, birefringent optical waveguide is provided running between two end faces of the lithium niobate crystal along its surfaces and provided on one section of its length with a thin film of proton-exchanged lithium niobate, said film being covered by a gas-sensitive film to which a measuring gas can be applied and forming a measuring area, and also consisting of an electro-acoustic transducer located on the surface in front of the measuring area for TM/TE mode conversion. The inlet aperture of the waveguide is designed to receive polarized laser radiation and a light detector to receive measuring light emitted in transmission by the outlet end face. The main feature of the invention is that several of the described measuring areas are provided on one and the same substrate, each area being allocated to a gas-sensitive f ilm of specific sensitivity, and that at least one of the gas-sensitive films also runs across a section of the waveguide which has no proton-exchanged film and which serves as the reference area to recover a correction signal, and that, at both ends of the optical waveguide, a monomode shaped acoustic waveguide is embedded in the surface of the substrate running at least across the ...
Language
de
Patenprio
DE 1991-4138221 A: 19911121