Title :
Sensor System Based on a Brillouin Fiber Laser for Remote in Series Fiber Bragg Gratings Interrogation
Author :
Ullan, Angel ; Quintela, Maria Angeles ; Rodriguez-Cobo, Luis ; Quintela, Antonio ; Lopez-Higuera, Jose Miguel
Author_Institution :
Dept. of TEISA, Univ. de Cantabria, Santander, Spain
Abstract :
A simple sensor system designed to monitor the temperature or strain of a certain number of critical points along a structure is presented and demonstrated. It is based on the remote interrogation of fiber Bragg gratings (FBGs) placed in series by means of a Brillouin fiber laser. Three FBGs were interrogated 50 km from the processing unit using 8 mW of Brillouin pump. Heterodyne detection brings forth a signal-to-noise ratio of approximately 40 dB in our measurements.
Keywords :
Bragg gratings; critical points; fibre lasers; fibre optic sensors; heterodyne detection; laser noise; optical design techniques; optical pumping; remote sensing by laser beam; strain sensors; temperature sensors; Brillouin fiber laser; Brillouin pump; FBG; critical points; distance 50 km; heterodyne detection; power 8 mW; processing unit; remote interrogation; remote sensor system; series fiber Bragg grating interrogation; signal-to-noise ratio; strain monitoring; temperature monitoring; Bragg gratings; Optical fiber amplifiers; Optical fiber networks; Optical fiber sensors; Scattering; Brillouin fiber laser; fiber Bragg grating (FBG); interrogation technique; remote sensing; sensor multiplexing;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2012.2210954
