Differential Cross Spectrum Technique for Improving the Spatial Resolution of BOTDR Sensor
Differential Cross Spectrum Technique for Improving the Spatial Resolution of BOTDR Sensor
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提高BOTDR传感器空间分辨率的差分互谱技术
DOI：
10.1109/icp.2018.8533208
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
T. Horiguchi
中科院分区：
文献类型：
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作者：
M. Zan;Yuki Masui;T. Horiguchi
提出了一种在BOTDR光纤传感器中通过强度调制产生一对脉冲探针的技术，用于测量高空间分辨率的分布应变。第一个探测器由一个长脉冲和一个短脉冲组成，脉冲之间间隔很短。第二探针仅具有第一探针的长脉冲。对每个探头分别采用宽窗函数和窄窗函数采样后的后向散射信号，通过FFT相关得到窄布里渊谱宽。通过两个探头获得的相关信号的相减导致高空间分辨率测量。强度调制使得更容易产生具有相同长脉冲波形的一对脉冲探针，并根据测量原理获得结果。我们已经实现了0.2米的空间分辨率和3.2 MHz的布里渊频率精度测量350米的光纤。
We propose a technique in BOTDR fiber sensor to generate a pair of pulsed probes via intensity modulation scheme for measuring distributed strain at high spatial resolution. The first probe consists of a long-and short duration of pulses separated by a short interval. The second probe only has the long pulse of the first probe. Introducing FFT in correlating the backscattered signals sampled by wide and narrow window functions for each probe gives narrow Brillouin spectrum width. The subtraction of the correlated signals obtained by the two probes results in high spatial resolution measurement. The intensity modulation makes it easier to generate the pair of pulsed probes having the same waveform of the long pulse and to obtain the results according to the measurement principle. We have achieved 0.2 m spatial resolution and 3.2 MHz Brillouin frequency accuracy in measuring a 350 m fiber.
采用PPP-BOTDA方法的2cm空间分辨率布里渊分布式传感系统
DOI：
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发表时间：
2008
期刊：
影响因子：
--
作者：
K. Kishida;C. H. Li and N. Takeda
通讯作者：
C. H. Li and N. Takeda