Title :
Brillouin-Based Distributed Temperature Sensor Employing Pulse Coding
Author :
Soto, Marcelo A. ; Sahu, Prasant K. ; Bolognini, Gabriele ; Pasquale, Fabrizio Di
Author_Institution :
Scuola Superiore Sant´´Anna, Pisa
fDate :
3/1/2008 12:00:00 AM
Abstract :
A distributed temperature sensor based on spontaneous Brillouin scattering and employing optical pulse coding has been implemented and characterized using a direct-detection receiver. The signal-to-noise ratio (SNR) enhancement provided by coding is analyzed, along with the influence of coding in stimulated Brillouin threshold. Simplex-coding using 127 bit codeword provides up to 7 dB SNR improvement, allowing for temperature sensing over 21 km of dispersion shifted fiber with 3.1 K resolution and 40 m spatial resolution, permitting to avoid the use of optical pulse amplification.
Keywords :
distributed sensors; fibre optic sensors; temperature sensors; Brillouin-based distributed temperature sensor; direct-detection receiver; optical pulse amplification; optical pulse coding; pulse coding; signal-to-noise ratio enhancement; spontaneous Brillouin scattering; Brillouin scattering; Fiber nonlinear optics; Optical pulses; Optical receivers; Optical scattering; Optical sensors; Raman scattering; Sensor phenomena and characterization; Signal to noise ratio; Temperature sensors; Brillouin scattering; distributed-fiber sensor; optical time-domain reflectometry (OTDR);
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2007.913143
