Method for compensation of fiber optic measurement systems and fiber optic measurement system

US9562815B2 · kind B2 · utility

Assignee

• TECHNISCHE UNIVERSITÄT MÜNCHEN · DE

Inventors

• Thorbjörn Buck · Birkenfeld, DE
• Lars Hoffmann · Birkenfeld, DE
• Mathias Müller · Viersen, DE
• Rolf Wojtech · Birkenfeld, DE

Key dates

• Filing date: Jun 4, 2013
• Grant date: Feb 7, 2017
• Expiry date: Jul 31, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L1/26
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present invention relates to a method for compensation, for example, for temperature compensation of a fiber optic measurement system designed for determining a mechanical quantity. First and second fiber Bragg gratings have a respective Bragg wavelength, wherein the fiber Bragg gratings are irradiated with primary light. After applying a mechanical quantity to the first and second fiber Bragg gratings, the Bragg wavelengths of the fiber Bragg gratings are changed by the mechanical quantity. Filtering of the first and second secondary light, said first and second secondary light is effected from the primary light and modified by the Bragg wavelength of the fiber Bragg grating depending on the mechanical quantity by use of an optical filter device follows, in such a way that the Bragg wavelength of the first fiber Bragg grating lies in the region of the rising filter gradient of the optical filter device and the Bragg wavelength of the second fiber Bragg grating lies in the region of the falling filter gradient of the optical filter device. After determining the intensities of the filtered first and second secondary light, they are compared, whereupon the mechanical quantity is …