Optical fiber distribution type sensor and optical fiber...

Details Optical fiber distribution type sensor and optical fiber... Optical fiber distribution type sensor and optical fiber...

2011-08-09

2011-08-09

Le, Uyen-Chau N (Department: 2874)

Optical waveguides

Optical waveguide sensor

C356S073100

Reexamination Certificate

active

07995874

ABSTRACT:
The present invention relates to an optical fiber distribution type detecting method and the like equipped with a structure for enabling efficient measurement of a temperature distribution or strain distribution. This method regulates a modulation frequency and modulation index for probe light and pumping light opposingly incident on an object from a light source and a phase difference between the probe light and pumping light, thereby successively setting the length and location of search domains in a region to be measured. In particular, a detection process is executed while resetting the search domain length shorter at a predetermined interval of time or when an abnormality is detected. Thus partly changing the distance resolution for a specific region in the course of the detection process enables efficient measurement operations in a short time.

REFERENCES:
patent: 6817257 (2004-11-01), Kluth et al.
patent: 7576840 (2009-08-01), Yamamoto
patent: 4-307328 (1992-10-01), None
patent: 2000-180265 (2000-06-01), None
patent: 2003-156315 (2003-05-01), None
Hotate et al., “Simplified System of Fiber Brillouin Optical Correlation Domain Analysis for Distributed Strain Sensing”, OFS-16, pp. 290-293 (Oct. 2003).

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