针对SF_6分解气的多参数综合监测平台设计

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英文篇名：Design of Multi-parameter Comprehensive Monitoring Platform for SF_6 Decomposition Gases 作者：皮本熙 ; 王艺钊 ; 赵博涛 ; 聂德鑫 ; 程林 英文作者：PI Ben-xi;WANG Yi-zhao;ZHAO Bo-tao;NIE De-xin;CHENG Lin;State Grid Electric Power Research Institute,Wuhan NARI Limited Liability Company;Beijing Optical Fiber Sensing System Engineering Technology Research Center,Beijing Institute of Aerospace Control Devices; 关键词：多频正弦调制 ; FPGA ; 锁相放大电路 ; 二次谐波 ; 在线监测 英文关键词：multi-frequency modulation;;FPGA;;lock-in amplifying circuit;;second hannonic;;on-line monitoring 中文刊名：DHKZ 英文刊名：Navigation and Control 机构：国网电力科学研究院武汉南瑞有限责任公司;北京航天控制仪器研究所北京市光纤传感系统工程技术研究中心; 出版日期：2017-06-05 出版单位：导航与控制 年：2017 期：v.16;No.67 基金：国家电网公司科技项目(编号:524625160030) 语种：中文; 页：DHKZ201703013 页数：5 CN：03 ISSN：11-5804/V 分类号：77-81

摘要

设计了SF_6分解气多参数综合监测平台,选择多频正弦调制方法研发了基于FPGA的多通道锁相放大电路,并对多通道锁相放大原理进行了理论推导,提出一种多频调制信号的频率分配原则。搭建针对多组分气体的多参数综合监测平台,给出温度、压强、微水、SF_6纯度等传感器的集成方案。实验结果表明,本系统平台能够从较低浓度的H_2S、HF、CO混合气体中正确解调出二次谐波信号,不同气体的二次谐波之间干扰性较小,对弱吸收的CO气体信号提高2个数量级,实现了多组分微量气体的同时监测。
        The paper designs a multi-parameter comprehensive monitoring platform for SF_6 decomposition gases.Multichannel lock-in amplifier circuits with multi-frequency modulation method is used in FPGA system.In this issue,the multichannel lock-in amplifier theories are presented in details,and one kind of frequency allocation principle of multi-frequency modulation signals is proposed.The sensor integration method of temperature,pressure,water vapor and the SF_6 purity is utilized through establishing the multi-parameter comprehensive monitoring platform for mixed gases.The experimental results indicate that the device developed in this paper could demodulate the second harmonic signals correctly from fewer mixed gases included H_2S,HF and CO.These signals have smaller disturbance among different second harmonics.In addition,the signal of CO that has weaker absorption coefficient is amplified 100 times.Thus,the on-line monitoring technique at the same time for multi-component fewer gases is realized.

引文

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