摘要
基于布里渊光时域反射计(BOTDR)设计了应变检测系统,用于采空区的沉降监测。该系统使用窄线宽激光器和高消光比光调制器产生脉冲光,并通过相干探测和微波扫频获取高信噪比的原始信号,最后采用洛仑兹曲线拟合算法解调出布里渊频移分布曲线。实验中,选用10.19 km的传感光纤,在末端3.9 m长度光纤上施加不同应变,以模拟采空区的沉降,解调的频移误差为2.1 MHz,对应应变测量误差为48.7με,该系统能为采空区的沉降监测提供一种方案和技术。
The strain detection system was designed based on a Brillouin optical time domain reflectometer（ BOTDR） for monitoring the goaf subsidence,in this paper.System used a narrow linewidth laser and a high-extinction-ratio light modulator to generate the pulse probe light,and acquired the original signal with high signal-to-noise ratio by coherent detection and microwave scanning.Then,the Lorenz curve fitting algorithm was utilized to obtain the distribution of the Brillouin frequency shift along the sensing fiber.Finally,the 10.19 km sensing fiber was chosen,and different strain was imposed on the 3.9 m segement of the fiber end to simulate the subsidence of the goaf.Experiment results demonstrate that the demodulation error of frequency shift is about2.1 MHz and the corresponding strain measurement error is 48.7 με.The system can provide a solution and technology for subsidence monitoring of the goaf.
出处
《仪表技术与传感器》
CSCD
北大核心
2017年第12期12-15,共4页
Instrument Technique and Sensor
基金
山西省煤基重点科技攻关项目(MQ2014-09)
山西省煤层气联合研究基金项目(2015012005)
山西省自然科学基金项目(201601D021068)
山西省研究生教育创新项目(2016BY066)
关键词
布里渊光时域反射计
采空区
沉降监测
高消光比
Brillouin optical time domain reflectometer
goaf
subsidence monitoring
high-extinction-ratio
作者简介
李哲哲（1988-）,硕士研究生,主要研究光纤传感及高速数据采集与传输.E-mail：Lzz_0806@163.com;靳宝全（1972-）,博士,教授,主要研究领域为新型传感器.E-mail：jbq_007@163.com
