摘要
为了精确定位矿难发生时井下生存人员的位置,结合矿井下的特殊环境,设计了一套无源、高灵敏度、高光信噪比的井下救援监测系统。该系统以分布式全光纤振动传感系统为核心,提出双光缆共用一套干涉的系统结构,采用线性安装,对采集的传感器信号进行小波去噪处理,根据小波去噪的功率谱估计,获得陷波点的位置,计算求得扰动发生的位置,定位振动点。结果表明:该系统具有可靠稳定、定位准确等特点,适用于井下矿难发生时的紧急救援。
The accuracy of communication positioning in underground mines has a direct effect on the rescue operation.This paper, combined with the special environment in the mines, presents a passive optical fiber sensing system designed with a high sensitivity and a high optical signal-to-noise ratio.This sensing system, based on Sagnac structure uniquely constructed using linear installation, owes its improved reliability to the following steps： employing a set of optical fiber cable interference system for dual-fiber cable;given a fixed resolution of the fast Fourier transform over time, eliminating the denoising in the system using wavelet transform denoising method;and using the power spectrum estimation of wavelet denoising to secure the location of the notch point and thereby calculate the disturbance location-locating the vibration point.The experiment demonstrates that the system affords a more reliable stability and a higher positioning accuracy and could work better for the emergency rescue in mine accidents.
出处
《黑龙江科技大学学报》
CAS
2017年第5期560-564,共5页
Journal of Heilongjiang University of Science And Technology
基金
国家重大科学仪器设备开发专项项目(2012YQ150213)
关键词
煤矿
救援定位
分布式光纤传感
振动传感
最大信噪比
小波降噪
coal mine
rescue positioning
distributed optical fiber sensor
vibration sensor
Maximum Signal-to-noise ratio
wavelet denoising
