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DISTRIBUTED OPTICAL FIBER SENSOR USING BRILLOUIN GAIN AND LOSS SIMULTANEOUS MEASUREMENT CAPABLE OF EXPANDING A MEASUREMENT DISTANCE BY MEASURING BRILLOUIN GAIN AND LOSS AT THE SAME TIME AND A SENSING METHOD
DISTRIBUTED OPTICAL FIBER SENSOR USING BRILLOUIN GAIN AND LOSS SIMULTANEOUS MEASUREMENT CAPABLE OF EXPANDING A MEASUREMENT DISTANCE BY MEASURING BRILLOUIN GAIN AND LOSS AT THE SAME TIME AND A SENSING METHOD
PURPOSE: A distributed optical fiber sensor using brillouin gain and loss simultaneous measurement and a sensing method are provided to measure physical deformation and temperature of a large building, a bridge, an aircraft, and a train using a brillouin optical spatial domain interpretation.;CONSTITUTION: A distributed optical fiber sensor comprises a test optical fiber, an optical attenuator (40), an optical modulation part (20), and an optical detecting part (50). The test optical fiber comprises a first section and a second section. The optical attenuator optically connects a gap between the first section and the second section. The optical modulation part applies a first optical signal to the test optical fiber through the first section and applies a second optical signal to the test optical fiber through the second section. The optical detecting part detects brillouin scattered light which is generated by the first optical signal and the second optical signal on a first correlation point positioned in the first section and a second correlation point positioned in the second section.;COPYRIGHT KIPO 2013;[Reference numerals] (210) Optical distribution unit; (225) Signal generation unit; (511) First attenuator; (512) Second attenuator; (530) RF signal distribution unit; (531) First phase-locking amplifier; (532) Second phase-locking amplifier
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