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基于傅里叶变换的差分吸收光谱法测量NH3和SO2浓度的实验研究

Study on Measuring Concentration of Ammonia and Sulphur Dioxide by Differential Optical Absorption Spectrometry Based on Fast Fourier Transform

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摘要

针对氨气(NH3)和二氧化硫(SO2)气体吸收谱线在196~214 nm 波段区域存在谱线重叠的问题,在采用傅里叶变换的差分吸收光谱法测量气体浓度基础上,采用分波段方法,解决NH3 和SO2 特征频谱相互串扰对测量的影响,采用非线性修正方法,解决在SO2 高浓度情况下出现的非线性吸收对NH3 气体测量的影响,采用经验模态分解(EMD)降噪处理方法,提高信噪比,最终实现对NH3和SO2气体浓度的同时准确测量。实验结果显示,NH3各个浓度测量误差均在±0.15 mL/m3以内,相对误差不超过±1.5%,最低可探测浓度为1.5 mL/m3;SO2各个浓度测量误差均在±2 mL/m3以内,相对误差不超过±1%,最低可探测浓度为16 mL/m3。

Abstract

For the overlap of the absorption spectrum of NH3 and SO2 from 196 nm to 214 nm, based on differential optical absorption spectrometry and fast Fourier transform to measure concentration of gases, a method that detecting these two gases simultaneously at two wave length bands is proposed. The crosstalk effects between the characteristic spectrum of NH3 and SO2 are solved. The interference of SO2 to NH3 which is caused by the nonlinearity of the absorption of SO2 with the increase of its concentration within 196~214 nm wavelength band is corrected, then the real concentration of NH3 are obtained. The signal to noise ratio is improved by empirical mode decomposition (EMD) noise reduction method. The measurement error of NH3 concentration is within ± 0.15 mL/m3 , ang the relative error is less than ±1.5%. The detectable concentration limit is 1.5 mL/m3. For SO2, the measurement error is within ±2 mL/m3, and the relative error is less than ±1%. The detectable concentration limit is 16 mL/m3.

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中图分类号:O433

DOI:10.3788/cjl201542.0915001

所属栏目:光谱学

基金项目:上海市自然科学基金(14ZR1445100)

收稿日期:2015-04-21

修改稿日期:2015-05-15

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作者单位    点击查看

郁敏捷:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800中国科学院大学, 北京 100049
刘铭晖:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800中国科学院大学, 北京 100049
董作人:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
孙延光:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
蔡海文:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
魏芳:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800

联系人作者:郁敏捷(yuminjienuaa@126.com)

备注:郁敏捷(1989—),男,硕士研究生,主要从事气体光谱检测方面的研究。

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引用该论文

Yu Minjie,Liu Minghui,Dong Zuoren,Sun Yanguang,Cai Haiwen,Wei Fang. Study on Measuring Concentration of Ammonia and Sulphur Dioxide by Differential Optical Absorption Spectrometry Based on Fast Fourier Transform[J]. Chinese Journal of Lasers, 2015, 42(9): 0915001

郁敏捷,刘铭晖,董作人,孙延光,蔡海文,魏芳. 基于傅里叶变换的差分吸收光谱法测量NH3和SO2浓度的实验研究[J]. 中国激光, 2015, 42(9): 0915001

被引情况

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【2】李志永,谭荣清,黄 伟,叶 庆,李 辉,韩高策. 傅里叶变换红外光谱技术测量甲烷气压的实验研究. 中国激光, 2017, 44(3): 301006--1

【3】张 勇,司福祺,李传新,曾 议,刘文清,周海金. 基于横向塞曼效应的烟气汞在线监测系统. 光学学报, 2017, 37(5): 501002--1

【4】苑媛媛,王书涛,王玉田,王志芳,杨 哲. 基于EMD和数学形态学的多环芳烃光谱去噪. 光学学报, 2017, 37(6): 630001--1

【5】张勇,司福祺,李传新,曾议,刘文清,周海金. 基于塞曼原子吸收法的燃煤电厂汞排放监测研究. 激光与光电子学进展, 2017, 54(8): 80101--1

【6】谈艳,王进,陶雷刚,孙羽,刘安雯,胡水明. 光腔衰荡光谱方法测量分子的高精密谱线参数. 中国激光, 2018, 45(9): 911002--1

【7】郭玲玲,赵其昌,杨勇,汪少林,舒锐. 星载傅里叶变换红外光谱仪的脉冲噪声抑制方法. 光学学报, 2020, 40(8): 830003--1

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