| 王 宇,郭柴旺,王俊虹,梁 斌,白 清,刘 昕,靳宝全.Φ-OTDR 系统非对称光纤耦合器相位解调方法研究[J].电子测量与仪器学报,2023,37(1):149-156 |
| Φ-OTDR 系统非对称光纤耦合器相位解调方法研究 |
| Study on phase demodulation method of asymmetricoptical fiber coupler in Φ-OTDR system |
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| DOI：10.13382/j.issn.1000-7105.2023.01.017 |
| 中文关键词: 光纤振动传感 相位敏感光时域反射仪 3×3 光纤耦合器 相位解调 |
| 英文关键词:optical fiber vibration sensing phase-sensitive optical time domain reflectometer 3 × 3 optical fiber coupler phase demodulation |
| 基金项目:国家自然科学基金(62175175)、山西省基础研究计划资助项目(202103021222010)、山西省专利转化专项计划项目(202202050)、山
西省重点研发计划项目(202102130501021)、山西省科技创新人才团队专项(201805D131003)项目资助 |
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| 中文摘要: |
| 针对 3×3 光纤耦合器三路输出信号非旋转对称易导致相位解调产生误差的问题,提出了基于 3×3 光纤耦合器两路输
出信号的非对称光纤耦合器相位解调系统理论,通过软件仿真分析验证了系统对单频周期信号与三次谐波信号的相位解调能
力,并在相位敏感光时域反射仪(Φ-OTDR) 上开展了光纤振动传感系统相位解调性能测试。 实验结果表明,系统能够实现
200~ 4 000 Hz 频率范围内的相位解调,振动定位绝对误差在±10 m 以内,系统空间分辨率为 21 m。 本方法在减少系统硬件成
本的基础上,为 Φ-OTDR 系统光纤耦合器分光比与相位差不恒定问题提供了新的解决思路与参考方案,可在交通安全监测等
领域进行应用推广。 |
| 英文摘要: |
| Aiming at the problem that the non-rotational symmetry of the three output signals of the 3×3 optical fiber coupler is easy to
cause the error of phase demodulation, this paper puts forward the theory of the asymmetric optical fiber coupler phase demodulation
system based on the two output signals of the 3×3 optical fiber coupler, and verifies the phase demodulation ability of the system for the
single frequency periodic signal and the third harmonic signal through software simulation analysis. The phase demodulation performance
of the optical fiber vibration sensing system is tested on the phase-sensitive optical time domain reflectometer ( Φ-OTDR). The
experimental results show that the system can realize phase demodulation in the range of 200~ 4 000 Hz, the absolute error of vibration
positioning is within ±10 m, and the spatial resolution of the system can reach 21 m. On the basis of reducing the hardware cost of the
Φ-OTDR system, this method can provide a new solution and reference scheme for the problem of unsteady splitting ratio and phase
difference of optical fiber coupler in Φ-OTDR system, and can be applied and popularized in the field of traffic safety monitoring |
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