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基于外差相敏色散光谱技术的宽动态范围甲烷气体检测

周晨 马柳昊 王宇

周晨, 马柳昊, 王宇. 基于外差相敏色散光谱技术的宽动态范围甲烷气体检测[J]. 中国光学(中英文). doi: 10.37188/CO.2023-0177
引用本文: 周晨, 马柳昊, 王宇. 基于外差相敏色散光谱技术的宽动态范围甲烷气体检测[J]. 中国光学(中英文). doi: 10.37188/CO.2023-0177
ZHOU Chen, MA Liu-hao, WANG Yu. Measurement of methane concentration with wide dynamic range using heterodyne phase-sensitive dispersion spectroscopy[J]. Chinese Optics. doi: 10.37188/CO.2023-0177
Citation: ZHOU Chen, MA Liu-hao, WANG Yu. Measurement of methane concentration with wide dynamic range using heterodyne phase-sensitive dispersion spectroscopy[J]. Chinese Optics. doi: 10.37188/CO.2023-0177

基于外差相敏色散光谱技术的宽动态范围甲烷气体检测

doi: 10.37188/CO.2023-0177
基金项目: 国家自然科学基金项目(No. 52106221);中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室开放基金项目(No. SKLA02022001A05)
详细信息
    作者简介:

    周 晨(2000—),男,湖北武汉人,硕士研究生,2021年于武汉理工大学获得学士学位,主要从事激光色散光谱技术研究。E-mail:zchen0101@whut.edu.cn

    马柳昊(1990—),男,湖北荆州人,博士,副研究员,硕士生导师,2012,2015年于华中科技大学分别获得学士和硕士学位,2019年于香港中文大学获得博士学位,主要从事大载荷、强辐射、非均匀燃烧流场光学诊断技术和新型激光色散光谱高温传感技术。E-mail:liuhaoma@whut.edu.cn

  • 中图分类号: O433.5+4

Measurement of methane concentration with wide dynamic range using heterodyne phase-sensitive dispersion spectroscopy

Funds: Supported by National Natural Science Foundation of China (No. 52106221); State Key Laboratory of Applied Optics (No. SKLA02022001A05)
More Information
  • 摘要:
    目的 

    为实现痕量甲烷气体的宽动态范围高灵敏度检测,本文发展了双边带拍频抑制模式的外差相敏色散光谱技术,探索了电光调制器工作特性以及偏置电压调控方法,对比了抑制与非抑制模式下的色散相位谱轮廓与信噪比,并对检测性能(如线性动态检测范围)进行了系统研究。

    方法 

    基于近红外分布式反馈激光器和电光调制器,搭建了外差相敏色散甲烷气体检测系统,通过探索和分析电光调制器的最佳工作区间,实现了双边带拍频抑制进而得到了大幅值、高信噪比的色散相位信号。测量了典型高频(1.2 GHz)强度调制下甲烷/氮气标气的色散相位信号,获取了色散相位信号峰峰值随气体浓度变化规律。同时开展了波长调制光谱技术实验,对两种技术的线性度,检测动态范围和对光功率波动的抗干扰性能进行对比研究。最后,通过测量不同浓度的标气验证了该系统在宽动态,快速时间响应下的性能。

    结果 

    所开发基于外差相敏色散光谱技术的甲烷检测系统具有线性度高(R2 = 0.9999),检测动态范围宽(38.5 ppm~40%),且对光功率波动免疫性高的显著优势。

    结论 

    本文研发的基于外差相敏色散光谱技术的气体检测技术在宽动态范围检测和实际现场检测应用领域具有广阔的前景。

     

  • 图 1  两个1倍频拍频信号的矢量和信号的相位φ

    Figure 1.  The phase φ of the vector sum of two beat note signals with a frequency of ωm.

    图 2  34.5 °C下激光器波长、功率与电流的关系

    Figure 2.  Laser wavelength and output power as a function of drive current at 34.5 °C

    图 3  基于双边带拍频抑制模式HPSDS技术的CH4检测系统示意图

    Figure 3.  Schematic diagram of CH4 detection system based on dual-sideband beat-suppressed HPSDS

    图 4  (a)实验测得的EOM输出光功率与其偏置电压的关系;(b)调制频率为1200 MHz,在抑制模式与非抑制模式下测得的10% CH4的色散相位信号(T = 298 K, P = 1 atm, L = 20 cm);(c)双边带拍频抑制后的拍频信号频谱图;(d)无双边带拍频抑制时的拍频信号频谱图

    Figure 4.  (a) The measured output power of EOM as a function of bias voltages; (b) Measured dispersion phase signals of 10% CH4 with or without dual-sideband beat suppression at the modulation frequency of 1200 MHz (T = 298 K, P = 1 atm, L = 20 cm); (c) The frequency spectrum of the beat note signal with suppression of dual-sideband beat; (d) The frequency spectrum of the beat note signal without suppression of dual-sideband beat

    图 5  (a) 不同CH4浓度下测得的色散相位信号;(b) HPSDS信号峰峰值随CH4浓度的变化关系

    Figure 5.  (a) Measured dispersion phase signals at different CH4 concentrations; (b) Peak-to-peak values of HPSDS signals as a function of CH4 concentration

    图 6  (a)不同CH4浓度下的HPSDS峰峰值、WMS-2f和WMS-2f/1f信号值; (b) 0.1%~0.8%浓度范围内的WMS-2f , WMS-2f/1f信号值-浓度线性关系

    Figure 6.  (a) HPSDS peak values, WMS-2f and WMS-2f/1f signals at different CH4 concentrations; (b) Linear relationship between WMS-2f, WMS-2f/1f signals and concentration within the range of 0.1% to 0.8% CH4, respectively

    图 7  (a) 15分钟连续测量10% CH4的结果浓度分布图;(b) 测量结果的频率分布直方图及高斯曲线拟合曲线;(c) HPSDS,WMS-2f和WMS-2f/1f 信号的Allan方差分析

    Figure 7.  (a) Diagram of concentration distribution results for continuous measurement of 10% CH4 for 15 minutes; (b) Frequency distribution of the measured concentration and the Gaussian profile fitting; (c) Allan deviation analysis of HPSDS, WMS-2f and WMS-2f/1f signals

    图 8  连续监测下CH4浓度随时间的变化结果

    Figure 8.  Results of continuous monitoring of CH4 in the gas flow

    图 9  (a) 不同激光功率下的HPSDS色散相位信号;(b) HPSDS峰峰值,WMS-2f和WMS-2f/1f信号峰值在不同激光功率下的变化情况

    Figure 9.  (a) Dispersion phase signals at different laser powers; (b) Variation of HPSDS peak-to-peak values, peak values of WMS-2f and WMS-2f/1f signals at different laser powers

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  • 收稿日期:  2023-10-10
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  • 网络出版日期:  2024-02-06

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