北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (11): 2187-2192.doi: 10.13700/j.bh.1001-5965.2017.0045

• 先进测量手段 • 上一篇    下一篇

基于波长调制谐波信号主峰拟合的气体浓度测量方法

杨阳1, 刘畅2, 徐立军2   

  1. 1. 北京航空航天大学 大型飞机高级人才培训班, 北京 100083;
    2. 北京航空航天大学 仪器科学与光电工程学院, 北京 100083
  • 收稿日期:2017-01-24 修回日期:2017-02-24 出版日期:2017-11-20 发布日期:2017-12-01
  • 通讯作者: 徐立军 E-mail:lijunxu@buaa.edu.cn
  • 作者简介:杨阳,女,硕士研究生。主要研究方向:燃烧过程监测与节能减排;徐立军,男,博士,教授,博士生导师。主要研究方向:单相/多相流测量/工业过程层析成像、燃烧过程监测与节能减排、三维激光雷达成像及应用、信号处理与信息融合。
  • 基金资助:
    国家自然科学基金(61225006,61327011,61370016,61522102)

Gas concentration measurement method based on WMS main peak spectrum fitting

YANG Yang1, LIU Chang2, XU Lijun2   

  1. 1. Large Aircraft Advanced Training Class, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
    2. School of Instrumentation Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2017-01-24 Revised:2017-02-24 Online:2017-11-20 Published:2017-12-01
  • Supported by:
    National Natural Science Foundation of China (61225006, 61327011, 61370016, 61522102)

摘要: 为了提高激光波长调制光谱法(WMS)测量气体浓度的速度和准确度,首次提出了一种通过对吸收光谱谐波信号的主峰进行拟合的气体浓度测量方法。在该方法中,只扫描吸收光谱谐波信号的主峰部分来获得谐波信号(WMS-2f/1f)的峰值点。因为缩减了吸收光谱的扫描范围,所以扫描速度得到了提高。通过对吸收光谱谐波信号(WMS-2f/1f)的主峰部分进行多项式拟合,进一步提高了测量精度。详细讨论了多项式阶数的确认方法,以及拟合数据长度对测量结果的影响。通过测量不同情况下的二氧化碳浓度验证了该方法的有效性。

关键词: 波长调制光谱法(WMS), 多项式拟合, 吸收光谱, 气体浓度, 二氧化碳

Abstract: A fast and accurate gas concentration measurement method by fitting the main peak of the absorption spectrum harmonic signal is proposed for the first time to significantly improve the speed and accuracy of gas concentration measurement by laser wavelength modulation spectroscopy (WMS). In the proposed method, only the main peak of the absorption spectrum harmonic signal is scanned to obtain the peak value of the harmonic signal (WMS-2f/1f). This can greatly improve the scan speed due to the reduction of absorption spectrum scan range. Higher accuracy measurement can be achieved via fitting the main peak of the absorption spectrum harmonic signal (WMS-2f/1f) by a polynomial. The methods for choosing a suitable polynomial's degree and the influence of fitting data length on measurement result are discussed in this paper. The experimental results of carbon dioxide concentration measurement under different conditions validate the effectiveness of the proposed method.

Key words: wavelength modulation spectroscopy(WMS), polynomial fitting, absorption spectrum, gas concentration, carbon dioxide

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