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; 刘畅; 徐立军

doi:10.13700/j.bh.1001-5965.2017.0045

基于波长调制谐波信号主峰拟合的气体浓度测量方法

doi: 10.13700/j.bh.1001-5965.2017.0045

杨阳¹,
刘畅²,
徐立军^2, ,

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

基金项目:

国家自然科学基金 61225006

国家自然科学基金 61327011

国家自然科学基金 61370016

国家自然科学基金 61522102

详细信息

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

通讯作者:
徐立军, E-mail: lijunxu@buaa.edu.cn

中图分类号: TP273
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- 文章访问数: 490
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- PDF下载量: 355
- 被引次数: 0
出版历程
- 收稿日期: 2017-01-24
- 录用日期: 2017-02-24
- 网络出版日期: 2017-11-20

Gas concentration measurement method based on WMS main peak spectrum fitting

YANG Yang¹,
LIU Chang²,
XU Lijun^{2
, ,}

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

Funds:

National Natural Science Foundation of China 61225006

National Natural Science Foundation of China 61327011

National Natural Science Foundation of China 61370016

National Natural Science Foundation of China 61522102

More Information

Corresponding author: XU Lijun, E-mail: lijunxu@buaa.edu.cn

摘要

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。
- 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.
- wavelength modulation spectroscopy(WMS) /
- polynomial fitting /
- absorption spectrum /
- gas concentration /
- carbon dioxide

HTML全文

图 1 被测气体是CO₂时在吸收中心为6 357.3 cm^-1处仿真的WMS-2f/1f及其导数

Figure 1. Simulated WMS-2f/1f and its derivative at absorption center of 6 357.3 cm^-1 with CO₂ as measured gas

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图 2 WMS-2f/1f峰值的真值与测量值的绝对差随着多项式阶数的变化

Figure 2. Variation of absolute deviation between true peak value and measured peak value of WMS-2f/1f with degree of polynomial

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图 3 使用2种方法分别对谐波信号进行处理时，测量气体浓度信噪比与主峰部分参与拟合数据长度的变化

Figure 3. Variation of gas concentration SNR with length of data involved in main peak fitting for two harmonic signal processing methods

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图 4 WMS-2f/1f以及主峰拟合后的结果

Figure 4. Curve fitting results of standardized second harmonic signal WMS-2f/1f and main peak

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图 5 使用2种方法分别对谐波信号进行处理时，测量信噪比随气体浓度的变化

Figure 5. Variation of measured SNR with gas concentration for two harmonic signal processing methods

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