G - Physics – 01 – C
Patent
G - Physics
01
C
G01C 19/72 (2006.01) G01C 25/00 (2006.01)
Patent
CA 2135809
A phase-modulated light stream is propagated through an optical-fiber sensing loop, from which a propagated light stream is obtained. The propagated light stream is converted to an electric signal, from which a fundamental-wave component and even-number harmonic-wave components for the phase-modulated signal are detected. In accordance with the changes of the fundamental- and even-number harmonic-wave components, a fault is detected. On the other hand, the electric signal may be integrated to provide an integrated signal. In accordance with the comparison between the integrated signal and a fault reference voltage, the fault may be detected.
Akiyama Munehiro
Kajioka Hiroshi
Kobayashi Osamu
Kumagai Tatsuya
Oho Shigeru
G. Ronald Bell & Associates
Hitachi Ltd.
Hitachi Cable Ltd.
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