To provide a new method and apparatus for inspecting an optical fiber sensor which can inspect an FBG (Fiber Bragg Grating) sensor, abnormalities of an optical source for optical fibers and a fault.
Entrance of light is carried out for an optical fiber having a plurality of Bragg grid sensors by which Bragg lattice spacings differ. An optical receiving section receives a reflected light reflected from each Bragg grid sensor. Noise level is detected from the spectrum of a returning light which received. The optical receiving section sets noise level of normal case as a reference noise level beforehand, when the reference noise level is compared with the noise level received by the optical receiving section and an absolute value of the difference exceeds a predetermined range, it determines that the optical receiving section is faulted.
NAGASHIMA MASAHIRO
MOGI ATSUSHI
| JP2004361284A | 2004-12-24 | |||
| JPH10209967A | 1998-08-07 | |||
| JP2003222507A | 2003-08-08 |
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka
Next Patent: INSPECTING METHOD AND INSPECTING APPARATUS OF OPTICAL FIBER SENSOR