Distributed optical sensing with two-step evaluation

US9726546B2 · kind B2 · utility

Assignee

• AP Sensing GmbH · DE

Inventors

• Gregor Cedilnik · Prien am Chiemsee, DE
• Gerd Koffmane · Althengstett, DE

Key dates

• Filing date: Feb 13, 2015
• Grant date: Aug 8, 2017
• Expiry date: Feb 13, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G01K11/324
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

According to an embodiment there is provided a distributed optical sensing apparatus for determining of a primary quantity along a waveguide, the distributed optical sensing apparatus comprising: an electromagnetic radiation source adapted for coupling electromagnetic radiation into the waveguide to thereby generate in the waveguide (e.g. by interaction with the waveguide) a first response radiation and a different second response radiation; a detector device adapted for providing a first measurement signal indicative of the first response radiation and a second measurement signal indicative of the second response radiation; an evaluation unit adapted for deriving a secondary quantity (e.g. a loss) based on the first measurement signal and the second measurement signal; the evaluation unit being further adapted for deriving the primary quantity based on the secondary quantity and at least one of the first measurement signal and the second measurement signal.