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Phase-Sensitive Optical Time-Domain Reflectometer Based on a 120$^{\circ}$-Phase-Difference Michelson Interferometer |
| Yu-Long Cao1,2, Fei Yang1**, Dan Xu1,2, Qing Ye1, Hai-Wen Cai1**, Zu-Jie Fang1 |
1Shanghai Key Laboratory of All Solid-state Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
2University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Yu-Long Cao, Fei Yang, Dan Xu et al 2016 Chin. Phys. Lett. 33 050701 |
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Abstract A phase-sensitive optical time domain reflectometer ($\phi$-OTDR) based on a 120$^{\circ}$-phase-difference Michelson interferometer is proposed. The Michelson interferometer with arm difference of 4 m is used to test the phase difference between the Rayleigh scattering from two sections of the fiber. A new demodulation method called the inverse transmission matrix demodulation scheme is utilized to demodulate the distributed phase from the backward scattering along the long fiber. The experimental results show that the 120$^{\circ}$-phase-difference interferometer $\phi$-OTDR can detect the phase along the 3 km fiber, and the acoustic signal within the whole human hearing range of 20 Hz–20 kHz is reproduced accurately and quickly.
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Received: 15 December 2015
Published: 31 May 2016
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| PACS: |
07.07.Df
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(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
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07.60.Ly
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(Interferometers)
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52.38.Bv
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(Rayleigh scattering; stimulated Brillouin and Raman scattering)
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