Mompó Juan José, Martín-López Sonia, González-Herráez Miguel, Loayssa Alayn
Opt Lett. 2018 Apr 1;43(7):1499-1502. doi: 10.1364/OL.43.001499.
We demonstrate a technique to reduce the sidelobes in optical pulse compression reflectometry for distributed acoustic sensing. The technique is based on using a Gaussian probe pulse with linear frequency modulation. This is shown to improve the sidelobe suppression by 13 dB compared to the use of square pulses without any significant penalty in terms of spatial resolution. In addition, a 2.25 dB enhancement in signal-to-noise ratio is calculated compared to the use of receiver-side windowing. The method is tested by measuring 700 Hz vibrations with a 140 nε amplitude at the end of a 50 km fiber sensing link with 34 cm spatial resolution, giving a record 147,058 spatially resolved points.
我们展示了一种用于分布式声学传感的光学脉冲压缩反射测量中降低旁瓣的技术。该技术基于使用具有线性频率调制的高斯探测脉冲。结果表明，与使用方波脉冲相比，这可将旁瓣抑制提高13 dB，且在空间分辨率方面没有任何显著损失。此外，与使用接收机端加窗相比，计算得出信噪比提高了2.25 dB。该方法通过在一条50 km光纤传感链路末端测量幅度为140 nε的700 Hz振动进行了测试，空间分辨率为34 cm，给出了创纪录的147,058个空间分辨点。
