基于自发布里渊散射的远程拉曼放大分布式声学传感器用于大应变传感

Long Range Raman-Amplified Distributed Acoustic Sensor Based on Spontaneous Brillouin Scattering for Large Strain Sensing.

作者信息

Bakhtiari Gorajoobi Shahab, Masoudi Ali, Brambilla Gilberto

机构信息

Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK.

出版信息

Sensors (Basel). 2022 Mar 6;22(5):2047. doi: 10.3390/s22052047.

DOI:10.3390/s22052047

PMID:35271194

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8915083/

Abstract

A Brillouin distributed acoustic sensor (DAS) based on optical time-domain refractometry exhibiting a maximum detectible strain of 8.7 mε and a low signal fading is developed. Strain waves with frequencies of up to 120 Hz are measured with an accuracy of 12 με at a sampling rate of 1.2 kHz and a spatial resolution of 4 m over a sensing range of 8.5 km. The sensing range is further extended by using a modified inline Raman amplifier configuration. Using 80 ns Raman pump pulses, the signal-to-noise ratio is improved by 3.5 dB, while the accuracy of the measurement is enhanced by a factor of 2.5 to 62 με at the far-end of a 20 km fiber.

摘要

开发了一种基于光时域折射测量的布里渊分布式声学传感器（DAS），其最大可检测应变为8.7 με，且信号衰落较低。在8.5 km的传感范围内，以1.2 kHz的采样率和4 m的空间分辨率，可测量频率高达120 Hz的应变波，精度为12 με。通过使用改进的在线拉曼放大器配置，传感范围进一步扩大。使用80 ns的拉曼泵浦脉冲，信噪比提高了3.5 dB，同时在20 km光纤的远端，测量精度提高了2.5倍，达到62 με。