Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-06-05
2007-06-05
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C359S334000, C385S012000, C356S073100
Reexamination Certificate
active
11062714
ABSTRACT:
Provided is a physical quantity measuring method using a Brillouin optical fiber sensor. An optical fiber is set on a structure and a pair of pulse lights having different pulse widths is selected. The pulse lights are sequentially transmitted through the optical fiber to obtain back scattering lights and Brillouin gain spectra. The Brillouin gain spectra are compared to each other to calculate a normalized spectrum and a Brillouin frequency is acquired based on the normalized spectrum. The Brillouin frequency is multiplied by a conversion factor of a corresponding physical quantity of the structure to obtain the physical quantity. Accordingly, a portion of the optical fiber from which a sensing signal can be acquired is shortened to improve spatial resolution.
REFERENCES:
patent: 2006/0018586 (2006-01-01), Kishida
Marc Nikles, Simple distributed fiber sensor based on Brillouin gain spectrum analysis, May 15, 1996, Optics Letters, vol. 21, No. 10, Optical Society of America, Switzerland.
Optical Fiber Strain Analyzer AQ8603, Measuring the strain disctribution in the fiber axial direction from one end, www.ando.com, Ando, Japan.
Kim Sang Hun
Kwon Il Bum
Lee Jeong Joo
Yoon Dong Jin
DeMont & Breyer LLC
Epps Georgia
Korea Advanced Institute of Science and Technology
Korea Research Institute of Standards and Science
Williams Don
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