Bragg grating temperature/strain fiber sensor having combination interferometer/spectrometer output arrangement

US6137565A · kind A · utility

Assignee

• JENOPTIK GmbH · DE

Inventors

• Wolfgang Ecke · Jena, DE
• Steffen Goerlich · Jena, DE
• Siegfried Belke · Jena, DE

Key dates

• Filing date: May 6, 1999
• Grant date: Oct 24, 2000
• Expiry date: May 6, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G01K11/3206
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An arrangement for simultaneous optical determination of temperature and strain fluctuations in an optical fiber for precisely determining the changes in environmental influences and/or fiber loads is disclosed. The arrangement performs two different measurement tasks of the absolute measurement of a stationary quantity, such as temperature and the relative, high-resolution measurement of quickly varying quantities of fluctuation processes with comparable accuracy in a single optical The arrangement which is achieved using a spectrometer with an imaging, spectrally dispersive element, a first input light bundle being arranged with reference to the dispersive element such that the light spectrally dispersed at the dispersive element is projected onto a first linear receiver The arrangement, and an additional second input light bundle is directed onto the dispersive element in the spectrometer, whose spectrally dispersed light falls onto a second linear receiver The arrangement, parallel to the first one, the two input light bundles are fed light from a broadband light source which has been reflected by at least two optical fiber gratings with different mean wavelengths, and an inter…