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具有复杂光谱特征的丙烯气体的TDLAS检测技术研究

钟笠 宋迪 焦月 李晗 李国林 季文海

钟笠, 宋迪, 焦月, 李晗, 李国林, 季文海. 具有复杂光谱特征的丙烯气体的TDLAS检测技术研究[J]. 中国光学, 2020, 13(5): 1044-1054. doi: 10.37188/CO.2019-0203
引用本文: 钟笠, 宋迪, 焦月, 李晗, 李国林, 季文海. 具有复杂光谱特征的丙烯气体的TDLAS检测技术研究[J]. 中国光学, 2020, 13(5): 1044-1054. doi: 10.37188/CO.2019-0203
ZHONG Li, SONG Di, JIAO Yue, LI Han, LI Guo-lin, JI Wen-hai. TDLAS detection of propylene with complex spectral features[J]. Chinese Optics, 2020, 13(5): 1044-1054. doi: 10.37188/CO.2019-0203
Citation: ZHONG Li, SONG Di, JIAO Yue, LI Han, LI Guo-lin, JI Wen-hai. TDLAS detection of propylene with complex spectral features[J]. Chinese Optics, 2020, 13(5): 1044-1054. doi: 10.37188/CO.2019-0203

具有复杂光谱特征的丙烯气体的TDLAS检测技术研究

doi: 10.37188/CO.2019-0203
基金项目: 山东省自然科学基金(No. ZR2017LF023);青岛科技惠民专项(No. 17-3-3-89-nsh);吉林大学集成光电子学国家重点实验室开放课题(No. IOSKL2017KF01);中国石油大学(华东)自主创新计划(No. 19CX02045A);山东省重点研发课题(No. 2019GHY112084,No. 2019GGX104103)
详细信息
    作者简介:

    钟笠:钟 笠(1995—),男,湖北孝感人,硕士研究生,2017年于中国石油大学(华东)获得学士学位,主要从事光电检测技术方面的研究。E-mail:upczhongli@163.com

    李国林(1987—),男,山东潍坊人,博士,硕士生导师,2010,2015年于吉林大学分别获得电子信息工程专业学士学位,电路与系统博士学位,主要从事红外光谱技术、红外气体传感以及光电信号检测等痕量气体检测方面的研究。E-mail :liguolin@upc.edu.cn

    季文海(1975—),男,山东聊城人,博士,副教授,硕士生导师,1998年于华东师范大学获得学士学位,2002年、2007年于美国俄勒冈大学(University of Oregon)分别获得硕士和博士学位,主要从事激光光谱技术的过程分析和安全检测方面的研究。E-mail:jiwenhai@upc.edu.cn

    通讯作者:

    季文海 E-mail: jiwenhai@upc.edu.cn 手机号:17753282258 通讯地址:山东省青岛市西海岸新区长江西路66号中国石油大学(华东)控制科学与工程学院

  • 中图分类号: O433.1

TDLAS detection of propylene with complex spectral features

Funds: Supported by Natural Science Foundation of Shandong Province (No. ZR2017LF023); Huimin Special Project of Qingdao Science and Technology Bureau (No. 17-3-3-89-nsh); Jilin University State Key Laboratory on Integrated Optoelectronics Open Research Grant (No. IOSKL2017KF01); China University of Petroleum (East China) Independent Innovation Program(No. 19CX02045A); Shandong Provincial Key R&D Projects ( No. 2019GHY112084, No. 2019GGX104103)
More Information
  • 摘要: 本文针对化工过程中在线检测丙烯的需求,研究了基于调制吸收光谱技术(TDLAS)的检测技术,提出了一种独立于光谱线型特征的数值仿真方法,考虑实际激光光源宽线宽对吸光度的影响,通过对比仿真和实验的光谱幅度变化规律,确定了丙烯气体分析装置的设计参数和技术方案,选择中心波长为1 628.5 nm的宽调谐DFB激光器,采用差分方案去除解调光谱的直流偏置,采用多元回归模型降低化工过程的背景气体光谱干扰。在模拟实际环境的气体实验中,该装置在0~1% 量程内的最大相对误差为0.55%。对0.2% 的丙烯进行3小时连续测量,标准差为9.3×10−6;Allen方差分析发现在积分时间为221.9 s 时,极限标准差可达1.33×10−6。在抗干扰测试中,当背景气体甲烷、乙烯的浓度变化时,丙烯的测量误差最大仅为19.17×10−6。调制吸收光谱技术克服了色谱和软测量等传统方法的不足,TDLAS装置可检测有复杂光谱特征的重烃分子,展示了测量精度高、稳定性好、抗背景光谱干扰能力强等优点。
  • 图  1  数据库中C3H6、CH4、C2H4、C2H6在1 628 nm附近的吸光度

    Figure  1.  Gas absorbance of C3H6、CH4、C2H4 and C2H6 near 1 628 nm in database

    图  2  丙烯光谱的3种线型拟合结果。(a)线型拟合;(b)拟合残差

    Figure  2.  Fitting results of three line types of propylene spectrum. (a) Absorption profile; (b) fitting residual

    图  3  激光器的线宽对丙烯光谱的影响。 (a)线宽对吸光度的影响;(b)线宽对丙烯仿真2f光谱的影响

    Figure  3.  The influence of laser linewidth on propylene spectrum. (a) Absorbance of propylene; (b) simulation 2f spectra of propylene

    图  4  不同调制幅度下C3H6的吸收光谱。(a)数值仿真;(b)实验采集

    Figure  4.  Absorption spectra of C3H6 with different modulation amplitudes. (a) Numerical simulation; (b) experiment

    图  5  不同调制幅度下C3H6的2f光谱峰值强度

    Figure  5.  2f spectra intensity of C3H6 at different modulation amplitudes

    图  6  实验系统装置图

    Figure  6.  Scheme of the experimental system

    图  7  激光器的波长、功率与电流的关系

    Figure  7.  Relations of laser wavelength and power withcurrent

    图  8  差分方案设计的C3H6实验光谱

    Figure  8.  Experimental spectra of C3H6 in the differential scheme

    图  9  分析装置采集到的C3H6、CH4、C2H4吸收光谱和N2背景下光功率变化图

    Figure  9.  Absorption spectra of C3H6、CH4、C2H4 and optical power in N2 background acquired through the analyzer

    图  10  (a)步进测试过程中分析装置丙烯浓度读数曲线;(b)丙烯浓度设定值与分析装置测量值线性关系曲线

    Figure  10.  (a) Analyzer reading of C3H6 concentration in step test;(b) the linear response of C3H6 analyzer measurement vs. setting gas concentration

    图  11  稳定性测试结果。(a)丙烯浓度固定时分析装置浓度读数曲线; (b)Allan方差分析

    Figure  11.  Stability test results. (a) Analysis device reading curve when propylene concentration is fixed; (b) Allan deviation analysis

    图  12  CH4、C2H6背景气体浓度变化情况下装置的C3H6浓度读数

    Figure  12.  C3H6 concentration reading varying with the concentration of the background gas CH4 and C2H6

    表  1  步进测试的丙烯测量精度

    Table  1.   Measurement error of C3H6 concentration in step test (×10−6)

    Setting
    concentration
    Measured
    concentration
    Std.
    Deviation
    Absolute
    error
    0−12.126.2012.12
    1 0001 020.0919.4720.09
    2 0002 022.5741.7322.57
    5 0005 055.1351.5255.13
    10 00010 014.3258.6714.32
    下载: 导出CSV

    表  2  抗干扰测试结果

    Table  2.   Results of anti-interference test (10−6)

    SectionInterfering CH4Interfering C2H6Measured concentrationStd. deviationAbsolute error
    12 00001 997.5833.96−2.42
    21 000102 003.4633.843.46
    35001001 993.6433.63−6.36
    403002 019.1735.6419.17
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-10-22
  • 修回日期:  2019-12-09
  • 网络出版日期:  2020-06-29
  • 刊出日期:  2020-10-01

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