High-Speed Interferometric FBG Interrogator With Dynamic and Absolute Wavelength Measurement Capability

Author

Perry, Mark ; Orr, Philip ; Niewczas, Pawel ; Johnston, Michael

Author_Institution

Inst. for Energy & Environ., Univ. of Strathclyde, Glasgow, UK

Volume

31

Issue

17

fYear

2013

fDate

Sept.1, 2013

Firstpage

2897

Lastpage

2903

Abstract

A passive, interferometric wavelength demodulation technique has been extended to measure the absolute wavelengths of a multiplexed array of fiber Bragg grating sensors. The scheme retains its original strain resolution of 10 nε/√{Hz}. A proof-of-concept interrogation system was able to determine the absolute wavelength of Bragg peaks to within 20 pm (17 με). Static and dynamic Bragg grating strains were accurately demodulated in both absolute and relative wavelength measurement modes. This demonstration indicates that interferometric techniques are able to provide absolute, static and dynamic measurements of strain within a single platform.

Keywords

Bragg gratings; fibre optic sensors; light interferometry; strain measurement; absolute wavelength measurement capability; dynamic strain measurement; dynamic wavelength measurement capability; high speed interferometry FBG interrogator; interferometric technique; interferometric wavelength demodulation technique; multiplexed fiber Bragg grating sensor array; static strain measurement; Calibration; Fiber gratings; Optical interferometry; Sensors; Tuning; Wavelength measurement; Fiber Bragg gratings; interferometry; interrogation systems; optical fiber sensors;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2013.2276391

Filename

6574214