首页|基于FPGA的拉曼分布式光纤测温系统数据采集处理模块设计

基于FPGA的拉曼分布式光纤测温系统数据采集处理模块设计

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传统拉曼分布式光纤测温系统中,系统的空间分辨率、温度精度、传感距离和信噪比等重要指标受采集处理模块的采样速率、信号量化位数、板载内存和数据处理能力性能制约,导致无法发挥其全部性能.本文设计了一种基于现场可编程门阵列(FPGA)的长距离拉曼分布式光纤测温系统数据采集处理模块,采用AXI4总线分时突发读写DDR3存储器技术实现超长数据实时累加平均处理,通过用户数据报协议(UDP)实现FPGA与上位机之间的数据传输,并且使用上位机对接收的数据进行温度解调和显示.实验结果表明,所提出的数据采集处理模块能够支持89.6 km的光纤信号采集,在10万次累加平均处理后,测温信号信噪比达到43.65 dB,测温精度稳定在±0.21℃.该数据采集处理模块能够进一步推动拉曼分布式光纤测温系统的应用与发展.
Design of Data Acquisition and Processing Module for Raman-Distributed Optical-Fiber Temperature Measurement System Based on FPGA
In the traditional Raman-distributed optical-fiber temperature measurement system,the spatial resolution,temperature accuracy,sensing distance,and signal-to-noise ratio of the system are restricted by the sampling rate,signal quantization bits,onboard memory,and data processing ability of the data acquisition and processing module,preventing the system from performing at its full capacity.This paper presented the design of a data acquisition and processing module for long-distance Raman-distributed optical-fiber temperature measurement system based on field programmable gate array(FPGA).The module used the technique of AXI4 bus time-sharing burst read and write DDR3 memory to achieve the real-time cumulative and average processing of ultra-long data.Furthermore,the module realized data transmission between the FPGA and host computer utilizing the user datagram protocol(UDP)communication protocol and used the upper computer to demodulate and display the received data.Experimental results show that the proposed data acquisition and processing module can be applied in the optical-fiber signal acquisition range of 89.6 km,with the signal-to-noise ratio reaching 43.65 dB.Moreover,the temperature measurement accuracy is stable at±0.21℃under the 100000 times cumulative average processing of the temperature measurement signal.Thus,the data acquisition and processing module can further promote the application and development of Raman-distributed optical-fiber temperature measurement system.

Raman distributed optical fiber temperature measurement systemfield programmable gate arrayDDR3AXI4Cumulative average processing

陈洋、乔丽君、曹康怡、范卜文、郭浩森、秦嘉辰、李健、张明江

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太原理工大学新型传感器与智能控制教育部重点实验室,山西 太原 030024

太原理工大学电子信息与光学工程学院,山西 太原 030024

太原理工大学物理学院,山西 太原 030024

拉曼分布式光纤测温系统 现场可编程门阵列 DDR3 AXI4 累加平均处理

2024

激光与光电子学进展
中国科学院上海光学精密机械研究所

激光与光电子学进展

CSTPCD北大核心
影响因子:1.153
ISSN:1006-4125
年,卷(期):2024.61(17)