Reising Ethington, P.C.
High-performance distributed fiber sensing system based on EHz ultrafast pulse scanning
A high-performance distributed fiber sensing system based on EHz ultrafast pulse scanning. During testing of a disturbance signal, an internally frequency converted pulse light emitted by an EHz ultrafast pulse scanning laser enters a sensing fiber after passing through a circulator, and a backward Rayleigh scattering signal transmitted by the sensing fiber enters an unbalanced Michelson interferometer after passing through a coupler. By designing an arm length difference between two interference arms, interferences sequentially occur for the backward Rayleigh scattering light at a position where lengths of two adjacent arms differ. A signal received after passing through the unbalanced Michelson interferometer includes a phase difference signal caused by an external disturbance signal in the sensing fiber. Finally, variations of the phase difference signal over time are demodulated by using a phase demodulation unit, so that a dynamic measurement of the disturbance signal in the sensing fiber may be performed.
LASER INSTITUTE OF SHANDONG ACADEMY OF SCIENCE
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inventional inventional inventional
Sheng Bing Yanbin Wenan Ying Chen Jiasheng Yingying Chang Chang
Huang Cao Wu Zhao Shang Wang Ni Wang Li Wang