Optical waveguides – Optical waveguide sensor
Reexamination Certificate
2007-07-17
2007-07-17
Kim, Ellen E. (Department: 2874)
Optical waveguides
Optical waveguide sensor
Reexamination Certificate
active
11087828
ABSTRACT:
A Brillouin Optical Time-Domain Analysis (BOTDA) distributed sensor system and method use a continuous wave (cw) Stokes wave interrupted with a dark pulse for improved spatial resolution. The cw Stokes wave causes a continuous depletion of the pump wave. The dark pulse causes the depletion to stop for the duration of the pulse. Brillouin interactions are measured during the dark pulse. Very narrow dark pulses can be used because sufficient Stokes wave energy is maintained. The system produces a stronger time-domain signal and narrower linewidth Brillouin spectra than traditional techniques using a bright Stokes pulse. Narrower measurement pulses can be used leading to improved spatial resolution. A quasi-cw Stokes wave can be used to reduce the effect of stimulated Brillouin scattering (SBS) in long measurement fibers. The system can be used for distributed strain or temperature measurements.
REFERENCES:
patent: 4997277 (1991-03-01), Horiguchi et al.
patent: 7170590 (2007-01-01), Kishida
patent: 2003/0174924 (2003-09-01), Tennyson
patent: 2006/0018586 (2006-01-01), Kishida
patent: 2006/0109451 (2006-05-01), Lopez et al.
patent: 2 422 272 (2003-09-01), None
patent: WO 03/078932 (2003-09-01), None
Fellay, A. et al., Distributed sensing using stimulated Brillouin scattering : towards ultimate resolution, OSA Technical Digest Series, v. 16, 1997, pp. 324-327.
Bao, X. et al., Characterization of the Brillouin-loss spectrum of single-mode fibers by use of very short et al., Optics Letter, vol. 24, No. 8, Apr. 15, 1999, pp. 510-512.
Brown, Anthony W. et al. , Spatial Resolution Enhancement of a Brillouin-Distributed Sensor et al., Journal of Lightwave Technology, vol. 17, No. 7, Jul. 1999, pp. 1179-1183.
Brown, Anthony W. et al., Brillouin Scattering Based Distributed Sensors et al., Journal of Intelligent Material Systems and Structures, vol. 10, Apr. 1999, pp. 340-349.
Garus, Deiter et al., Brillouin Optical-Fiber Frequency-Domain et al., Journal of Lightwave Technology, vol. 15, No. 4, Apr. 1997, pp. 654-662.
Hotate, Kazuo et al., Distributed Fiber Brillouin Strain Sensing et al., IEEE Photonics Technology Letters, vol. 14, No. 2, Feb. 2002, pp. 179-181.
Afshar, Shahraam V. et al., Optics Letters, vol. 28, No. 16, Aug. 15, 2003, pp. 1418-1420.
Lecoeuche, V. et al., Transient Response in high-resolution Brillouin-based et al., Optics Letters, vol. 25, No. 3, Feb. 1, 2000.
Shiraki, Kazuyuki et al., SBS Threshold of a Fiber with a Brillouin Fequence Shift Distribution, Journal of Lightwave Technology, vol. 14, No. 1, Jan. 1996, pp. 50-57.
Brown Anthony
Brown Kellie A. S.
Colpitts Bruce
Blank Rome LLP
Kim Ellen E.
University of New Brunswick
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