基于拉曼放大的长距离BOTDR传感系统研究
Research on long-distance BOTDR sensing system based on Raman amplification
范敏 1张明红 2朱阳 1赵航航 1郑扬亮 1张礼昌 1石延辉 1李玉华 3袁孝红 3尹国路2
作者信息
- 1. 中国南方电网有限责任公司超高压输电公司广州局,广州 510600
- 2. 重庆大学光电技术及系统教育部重点实验室,重庆 400044
- 3. 重庆东电通信技术有限公司,重庆 401121
- 折叠
摘要
布里渊光时域反射(BOTDR)系统可实现沿传感光纤的全分布式温度和应变传感,然而由于光纤损耗的存在,布里渊信号光在长距离传输后往往会淹没在噪声中,信噪比极低.对此,利用拉曼泵浦对光纤全段布里渊信号的增益效果,研究拉曼放大前后系统在测量距离方面的差异和不同泵浦功率对应的放大曲线.通过实验验证了基于拉曼放大的BOTDR传感系统测量距离可提高至100 km量级;在50 m空间分辨率下,成功实现了光纤末端103 km处的温度测量,获得了2.19℃的测量精度.
Abstract
Brillouin optical time domain reflectometry (BOTDR ) system realizes fully distributed temperature and strain sensing along the sensing fiber.However,due to the fiber loss,Brillouin signal light is often submerged in noise after long-distance transmission,and the signal-to-noise ratio is extremely low.Through the gain effect of Raman pump on the whole Brillouin signal of optical fiber,this paper investigates the difference of system measurement distance before and after Raman amplification. Moreover,the corresponding amplification curves under different pump powers are compared. Our experiments show the measurement distance of the BOTDR sensing system based on Raman amplification rises to the order of 100 km,and the temperature at the end of the fiber at 103 km is successfully measured at a spatial resolution of 50 m,and the measurement accuracy of 2.19 ℃ is obtained.
关键词
光纤光学/布里渊散射/分布式传感/拉曼放大Key words
fiber optics/Brillouin scattering/distributed sensing/Raman amplification引用本文复制引用
基金项目
中国南方电网有限责任公司超高压输电公司科技项目(010100KK52222006)
出版年
2024
国家科技期刊平台
NSTL
万方数据