Optics: measuring and testing – Material strain analysis
Reexamination Certificate
2007-01-30
2007-01-30
Lee, Hwa Andrew (Department: 2877)
Optics: measuring and testing
Material strain analysis
C385S012000, C250S227140
Reexamination Certificate
active
10533049
ABSTRACT:
A distribution optical fiber sensor system measures distortion and temperature of a structure with a high spatial resolution. The system has an optical fiber on an object to be measured. A light source emits a first pulse light having a pulse width longer than a transient response of an acoustic phonon and a second pulse light after a time interval during which vibration of the acoustic phonon is maintained thereby supplying the pulse lights to the optical fiber. A detector detects scattering gain spectra of a Brillouin-scattered light created in the optical fiber by the second pulse light at intervals corresponding to twice the time obtained by equally dividing the pulse width of the second pulse light. A controlling/calculating unit calculates distortion and/or temperature based on the scattering gain spectra for sections of the optical fiber corresponding to the scattering gain spectra at the respective time intervals.
REFERENCES:
patent: 4708494 (1987-11-01), Kleinerman
patent: 6237421 (2001-05-01), Li et al.
patent: 2005/0213869 (2005-09-01), Brown et al.
patent: 2000-074697 (2000-01-01), None
patent: 2001-304823 (2001-01-01), None
pp. 325-327 —“Collection of Next-Generation Optical Technologies”, the first edition published on Dec. 10, 1997 —Optronics Co., Ltd.
J. Smith, A. Brown, M. DeMerchant, X. Bao —“Pulse width dependence of the Brillouin loss spectrum”—Optics Communication vol. 168 (1999), pp. 393-398.
Casella Anthony J.
Hespos Gerald E.
Lee Hwa (Andrew)
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