Optics: measuring and testing – For optical fiber or waveguide inspection
Reexamination Certificate
2006-06-06
2006-06-06
Dunn, Drew A. (Department: 2872)
Optics: measuring and testing
For optical fiber or waveguide inspection
Reexamination Certificate
active
07057714
ABSTRACT:
A method and system for measuring optical scattering characteristics includes coupling a continuous wave laser excitation signal to an optical fiber. Radiation backscattered by the optical fiber in response to the coupled excitation signal is detected to produce a backscattered radiation signal. The backscattered radiation signal is mixed with the excitation signal to produce a mixed signal. The mixed signal is filtered to reduce the magnitude of frequencies other than conjugate mixing frequencies relative to the conjugate mixing frequencies. The filtered signal is digitized and the magnitude of backscattered radiation from a specific portion of the fiber is calculated based on the digitized signal. The temperature of a specific portion of the fiber can be determined from the magnitude of the backscattered radiation.
REFERENCES:
patent: 4355898 (1982-10-01), Dakin
patent: 4495586 (1985-01-01), Andrews
patent: 4630228 (1986-12-01), Tarczy-Hornoch et al.
patent: 4673299 (1987-06-01), Dakin
patent: 4674872 (1987-06-01), Wright
patent: 4708471 (1987-11-01), Beckmann et al.
patent: 4794249 (1988-12-01), Beckmann et al.
patent: 4823166 (1989-04-01), Hartog et al.
patent: 5054935 (1991-10-01), Tanabe et al.
patent: 5062703 (1991-11-01), Wong et al.
patent: 5094526 (1992-03-01), Freud et al.
patent: 5102232 (1992-04-01), Tanabe et al.
patent: 5113277 (1992-05-01), Ozawa et al.
patent: 5196709 (1993-03-01), Berndt et al.
patent: 5272334 (1993-12-01), Sai
patent: 5292196 (1994-03-01), Iida et al.
patent: 5329392 (1994-07-01), Cohen
patent: 5449233 (1995-09-01), Sai et al.
patent: 5526109 (1996-06-01), Johnson
patent: 5818240 (1998-10-01), Cabot
patent: 5981957 (1999-11-01), Cruce et al.
patent: 6191846 (2001-02-01), Opsal et al.
patent: 6771358 (2004-08-01), Shigehara et al.
patent: 0320255 (1989-06-01), None
patent: 0403094 (1990-12-01), None
Derickson et al, Fiber Optic Test and Measurement, 1998, Prentice-Hall, Inc., pp. 423-431.
F.L. Galeener, et al., “The Relative Raman Cross Sections of Vitreous SIO2,GEO2,B2O3,And P2O5,” Appl. Phys. Lett., vol. 32, No. 1, pp. 34/36.
P. Di Vita, et al., “The Backscattering Technique: Its Field of Applicability in Fibre Diagnostics and Attenuation Measurements,” Optical and Quantum Electronics, vol. 11, pp. 17/22, 1980.
P. Healey, “Optical Time Domain Reflectometry—A Performance Comparison of the Analogue and Photon Counting Techniques,” Optical and Quantum Electronics, vol. 16, pp. 267/276, 1984.
G.W. Bibby, et al., “Raman Thermometry Using Optical Fibres,” Analytical Proceedings, vol. 22, No. 7, pp. 213/214, Jul. 1985.
A.H. Hartog et al., “Distributed Temperature Sensing in Solid/Core Fibres,” ELEC Letters, vol., 21, pp. 1061/1062, Nov. 1985.
J.P. Dakin, et al., “Temperature Distribution Measurement Using Raman Ratio Thermometry,” SPIE Fiber Optic and Laser Sensors III, vol. 566 , pp. 249/256, 1985.
R. Stierlin, et al., “Distributed Fiber/Optic Temperature Sensor Using Single Photon Counting Detection,” Applied Optics, vol. 26, No. 8 , pp. 1368/1370, Apr. 15, 1987.
J.K.A. Everard, et al., “Distributed Optical Fibre Temperature Sensor Using Spread/Spectrum Techniques,” Electronics Letters, vol. 25, No. 2 , pp. 140/142, Jan. 19, 1989.
B.K. Garside, et al., “A Photon Counting Optical Time/Domain Reflectometer for Distributed Sensing Applications,” SPIE Fiber Optic and Laser Sensors VII, vol. 1169 , pp. 89/97, 1989.
M.A. Marcus, et al., “Real/Time Distributed Fiber/Optic Temperature Sensing in the Process Environment,” SPIE Chemical, Biochemical, and Environmental Sensors, vol. 1172 , pp. 194/205, 1989.
Hewlett/Packard, “HP 8703A Lightwave Component Analyzer: Technical Specifications,” Hewlett/Packard, pp. 1/16, 1990.
Z. Zhang, et al., “A Novel Signal Processing Scheme for a Fluorescence Based Fiber/Optic Temperature Sensor,” Rev. Sci. Instrum., vol. 62 (7), pp. 1735/1742, Jul. 1991.
P.R. Orrell, et al., “Fiber Optic Distributed Temperature Sensing,” First European Conference on Smart Structures and Materials, pp. 151/154, 1992.
Agilent Technologies, “High/Speed Lightwave Component Analysis: Application Note 1550/6,” Agilent Technologies, pp. 1/23, 1992.
Hewlett/Packard, “High/Speed Lightwave Component Analysis: Application Note 1550/6,” Hewlett/Packard, pp. 1/23, date unavailable.
J. Zou, et al., “Distributed Fiber Optical Temperature Sensor Using Digital Boxcar Integrator,” SPIE Measurement Technology and Intelligent Instruments, vol. 2101 , pp. 412/414, 1993.
J.S. Namkung, et al., “Fiber Optic Distributed Temperature Sensor Using Raman Backscattering,” SPIE, vol. 1819 , pp. 82/88, 1993.
J.R. Alcala, et al., “Real Time Frequency Domain Fiberoptic Temperature Sensor,” IEEE Transactions on Biomedical Engineering, vol. 42, No. 5 , pp. 471/476, May 1995.
M. Hobel, et al., “High/Resolution Distributed Temperature Sensing with the Multiphoton/Timing Technique,” Applied Optics, vol. 34, No. 16 , pp. 2955/2967, Jun. 1995.
J.P. Dakin, et al., “Distributed Optical Fibre Raman Temperature Sensor Using a Semiconductor Light Source and Detector,” Electronics Letters, vol. 21, No. 10 , pp. 569/570, 1995.
Hewlett/Packard, “Fiber Optic Test Solutions for Network Installation and Maintenance,” Hewlett/Packard, pp. 1/12, 1997.
Lutes, et al., “Swept/Frequency Fiber/Optic Readout From Multiple Sensors and Technical Support Package,” NASA Tech Briefs, vol. 21, No. 10, Item #192, pp. 35, and JPL New Technology Report NPO/19725, pp. 1, 1/2, and 1A/6A, Oct. 1997.
Hitachi Cable, Ltd., “FTR: Hitachi Fiber Optic Temperature Laser Radar,” Hitachi Cable, Ltd., pp. 1/6, 1999.
Hitachi Cable, Ltd., “FTR Application Data Sheet TD/462C,” Hitachi Cable, Ltd., pp. 1/14, date unavailable.
B. Huttner, et al., “Optical Frequency Domain Reflectometer for Characterization of Optical Networks and Devices,” COMTEC, vol. 3/99, pp. 20/23, 1999.
Author: R. I. MacDonald,Entitled “Frequency domain optical reflectometer”—Applied Optics/vol. 20, No. 10; May 15, 1981; pp. 1840-1844.
Chin Robert
Fredin Leif
Hallidy William
Cooke, Jr. Claude E.
Dunn Drew A.
Pritchett Joshua L
Systems and Processes Engineering Corporation
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