摘要
基于相位敏感光时域反射计(Φ-OTDR)的分布式光纤振动传感系统向传感光纤中注入探测光脉冲,通过测量光脉冲传输过程中产生的背向瑞利散射光的波动实现对入侵扰动的识别和定位,故探测光脉冲对Φ-OTDR系统性能有重要影响。介绍了Φ-OTDR基于光脉冲调制方面的研究进展,其中包括光脉冲的宽度、频率、形状以及消光比等参数对Φ-OTDR系统性能影响机理,以及通过脉冲调制优化Φ-OTDR系统信噪比、报警率、空间分辨率、响应带宽等参数以及恢复振动信号波形方面的研究进展。旨在通过光脉冲调制实现Φ-OTDR系统多项性能指标同步提升提供新思路,进一步推动Φ-OTDR的工程应用。
Probe light pulses are injected into the sensing fiber by a distributed optical fiber vibration sensing system based on the phase-sensitive optical time-domain reflectometer(Φ-OTDR), then the vibration can be recognized and located by measuring the Rayleigh-backscattered light generated during the propagation of light pulses, so the probe light pulse has important effect on Φ-OTDR system performance. The research progress ofΦ-OTDR in pulse modulation was introduced, including the impact of optical pulse width, frequency, shape,extinction ratio and other parameters on the system mechanism, and the research progress in the optimization of system parameters such as signal-to-noise ratio, alarm rate, spatial resolution, response bandwidth and recovery of vibration signal waveform by pulse modulation. In addition, this paper provides a new idea to ascend multiple performance indicators of the Φ-OTDR system simultaneously by means of optical pulse modulation to promote the engineering applications of Φ-OTDR.
作者
钟翔
赵世松
邓华夏
张进
马孟超
Zhong Xiang;Zhao Shisong;Deng Huaxia;Zhang Jin;Ma Mengchao(School of Instrument Science and Opto-electronic Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2020年第10期185-194,共10页
Infrared and Laser Engineering
基金
国家自然科学基金(51705122,11872167,51675156,51775164)
中国博士后科学基金(2017 M612061)
中央高校基本科研业务经费(JZ2019HGTB0079)
安徽省自然科学基金(1908085J15)。
关键词
脉冲调制
光纤光学
光纤传感
相位敏感光时域反射
pulse modulation
fiber optics
optical fiber sensing
phase-sensitive optical time domain reflectometry
