High-Resolution Strain/Temperature Sensing System Based on a High-Finesse Fiber Cavity and Time-Domain Wavelength Demodulation
2009 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 27, no 13, 2477-2481 p.Article in journal (Refereed) Published
A high-resolution strain/temperature sensing system based on a fiber Bragg grating-Fabry-Perot cavity (FBG-FPC) and a wavelength-swept single-longitudinal-mode laser diode (modulated by a sawtooth signal) is proposed. The high-finesse (similar to 627) FBG-FPC formed by two uniform FBGs of high reflectivity (similar to 99.5%) is used both as a strain/temperature sensor and a FPC with ultranarrow (similar to 0.12 pm) transmission bands. Using a photodetector to detect the transmissive light of the laser diode through the FBG-FPC, wavelength demodulation is achieved by mapping wavelength measurement to time measurement. Both strain sensing and temperature sensing with a resolution of 0.11 mu epsilon and 0.014 degrees C, respectively, have been demonstrated.
Place, publisher, year, edition, pages
2009. Vol. 27, no 13, 2477-2481 p.
Fabry-Perot cavity, fiber Bragg grating, fiber sensor, strain/temperature sensor, bragg grating interrogation, laser, strain, sensor, temperature
IdentifiersURN: urn:nbn:se:kth:diva-18605DOI: 10.1109/jlt.2008.2011498ISI: 000267994200023ScopusID: 2-s2.0-67651093809OAI: oai:DiVA.org:kth-18605DiVA: diva2:336652
QC 201005252010-08-052010-08-052013-11-19Bibliographically approved