Multiwavelength Raman-fiber-laser-based long-distance remote sensor for simultaneous measurement of strain and temperature.
We propose a simple and flexible multiwavelength Raman-fiber-laser-based long-distance remote-sensing scheme for simultaneous measurement of strain and temperature by use of fiber Bragg gratings. By combining two uniform fiber Bragg gratings with a tunable chirped fiber grating, we readily achieve simultaneous two-channel sensing probes with a high extinction ratio of more than approximately 50 dB over a 50-km distance. When strain and temperature are applied, lasing wavelength separation and shift occur, respectively, since the two uniform fiber Bragg gratings have identical material composition and different cladding diameters. This allows simultaneous measurement of strain and temperature for long-distance sensing applications of more than 50 km.
Han
Young-Geun
YG
Photonics Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-Dong, Seongbook-Gu, Seoul 136-791, South Korea. yyghan@kist.re.kr
Tran
T V A
TV
Kim
Sang-Hyuck
SH
Lee
Sang Bae
SB
D004548:Elasticity; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D013059:Spectrum Analysis, Raman / Q000295:instrumentation* / Q000379:methods; D018511:Systems Integration; D013696:Temperature; D013817:Thermography / Q000295:instrumentation* / Q000379:methods