硬件可重构近红外波长调制甲烷传感器及应用(特邀)  

Hardware Reconfigurable Near Infrared Wavelength Modulated Methane Sensor and Its Application(Invited)

作　　者：师月崇 李亚飞 宋芳[1,2] 郑传涛 王一丁[1,2] SHI Yuechong;LI Yafei;SONG Fang;ZHENG Chuantao;WANG Yiding(State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China;Jilin Provincial Engineering Research Center of Infrared Gas Sensing Technique,Changchun 130012,China)

机构地区：[1]吉林大学电子科学与工程学院集成光电子学国家重点实验室,长春130012 [2]吉林省红外气体传感技术工程研究中心,长春130012

出　　处：《光子学报》2023年第10期80-91,共12页Acta Photonica Sinica

基　　金：国家重点研发计划(No.20213201903);国家自然科学基金(Nos.61960206004,62175087);吉林省科技发展计划(No.20200401059GX);吉林省教育厅科技发展规划项目(No.JJKH20211088KJ);长春市重点研发项目(No.21ZGN24);吉林省高教科研课题(Nos.JGJX2021D3,JGJX2021D4);吉林大学本科教学改革研究重点项目(No.2021XZD034)。

摘　　要：为了加快气体吸收光谱分析算法的求解速度、重构算法的硬件逻辑,采用现场可编程门阵列(FPGA)器件,结合波长调制光谱技术,研制了一种硬件可重构波长调制甲烷传感器。根据应用功能需求,可在硬件层面重构逻辑电路,从而更新系统工作模式和探测参数。采用流水线技术,对光谱分析算法进行了硬件加速,光谱分析部分的输入与输出之间的时间延迟仅为4.05 ms。实验分析了该传感器在连续、间歇两种工作状态下的波形与电流,证明了该系统工作模式的可重构特性,也证实了采用间歇式工作降低激光气体传感器功耗的可行性。采用正弦信号对FPGA算法部分的功能进行了测试,结果表明,测得的信号幅值与输入信号幅值的线性度达到了99.99%。采用中心波长为2334 nm的分布式反馈激光器作为光源、光程为25 m的赫里奥特气室作为气体吸收池,开展了甲烷检测实验。传感器的线性度为99.97%,响应时间约为4.9 s。艾伦方差结果表明,当积分时间为0.5 s时,传感器的检测下限为7.8×10^(-6)。开展的甲烷泄露实验证实了该传感器的现场应用能力。设计的FPGA算法,通过硬件编程,可实现传感器工作模式与参数的灵活重构,在激光气体传感领域具有较好的片上集成应用前景。At present,the demand for gas sensors is moving towards miniaturization,low power consumption and networking.Among them,laser absorption spectroscopy has wide application prospects in related fields with advantages of fast detection speed,high accuracy,good stability,and long service life.However,the commonly used laser gas sensor system is generally large in size,high in power consumption and high in cost,which is difficult to be widely used as a gas sensor node.Therefore,it is urgent to develop a new spectroscopy gas sensing system with small volume,low power consumption and low cost to promote the application of laser gas sensing technology in“carbon neutralization”.Based on the above social needs,we developed a hardware reconfigurable Wavelength Modulation Spectroscopy(WMS)methane sensor.Based on the characteristics of Field Programmable Gate Array(FPGA)hardware algorithm acceleration,the hardware-based wavelength modulation gas absorption spectroscopy analysis algorithm,realizes quasi-synchronous output of scan signal and harmonic signal amplitude as well as on-chip integration of WMS.The on-chip logic circuit is mainly divided into WMS analysis module and WMS drive signal generation module.Based on Direct Digital Synthesis(DDS)technology,the WMS drive signal generation module is used to generate sine wave and triangular wave signals required by WMS,and both signal frequency and phase can be tuned in a wide range,which can flexibly control the sensor operation according to an enabling signal.The core of WMS analysis module is an orthogonal phase-locked amplifier.This work focuses on enhancing the hardware reconfigurability to enhance the flexibility of the sensor system.Only when the enabling signal is in high level,the WMS analysis module and the drive signal generation module start to work,which lays the foundation for intermittent work,scanning signal alignment,and gas absorption fixed point analysis.The feasibility of the intermittent work is verified by the actual measurement.The system has a unifie

关 键 词：光电检测技术 红外吸收光谱 波长调制光谱 现场可编程门阵列 气体检测 

分 类 号：TN21[电子电信—物理电子学]