首页|基于不同宽带非相干光源的甲烷浓度测量研究

基于不同宽带非相干光源的甲烷浓度测量研究

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  • 国家科技期刊平台
  • NETL
  • NSTL
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目的:研究非相干宽带腔增强吸收光谱(IBBCEAS)技术中所应用的不同类型宽带光源的性能差异对系统输出信号的影响.方法:搭建了直径2.54 cm,长30 cm的气池,通入体积分数为99.99％的甲烷气体,分别采用非相干宽带卤素光源和超连续谱光源入射气池,通过光纤准直器耦合出射光进入近红外多模光纤,光纤接入近红外光谱仪测量吸收光谱.结果:两种光源的光学密度谱线对比显示超连续谱光源的光学噪声远大于卤素光源,其主要原因为超连续谱光源内部温度控制欠稳定导致输出功率在频域上出现较大波动造成的基线偏移.结论:相较于卤素光源,超连续谱光源具有光功率高,空间相干性好等诸多优点,但由于温度控制原因所导致的光功率输出不够稳定,导致该光源在IBBCEAS系统中的应用受到一定限制.
Study on methane concentration measurement based on various broadband incoherent light sources
Aims:This paper aims to investigate the effect of performance differences of different types of broadband light sources applied in the Incoherent Broadband Cavity Enhanced Absorption Spectroscopy(IBBCEAS)technique on the output signal of the system.Methods:A gas cell with a diameter of 2.54 cm and a length of 30 cm was constructed;and methane gas with a concentration of 99.99％was introduced.Incoherent broadband halogen light source and supercontinuum spectral light source were used to enter the gas cell,respectively.The emitted light was coupled into near-infrared multimode optical fiber through fiber collimators;and the optical fibers were connected to the near-infrared spectrometer to measure absorption spectra.Results:Comparison of the optical density spectra of the two light sources shows that the optical noise of the supercontinuum light source is much larger than that of the halogen light source,which is mainly due to the unstable temperature control inside the supercontinuum light source,resulting in large fluctuations in the output power in the frequency domain caused by the baseline shift.Conclusions:Compared with halogen light source,the supercontinuum spectrum light source has many advantages such as high optical power and good spatial coherence,but the application of this light source in IBBCEAS system is limited due to the lack of stability of optical power output caused by temperature control.

incoherent broadband cavity enhanced absorption spectroscopy(IBBCEAS)supercontinuum light sourcemethane concentration detectionmine safety

王禹涵、王坤阳、徐时清、张军杰、王世锋、郭杰

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中国计量大学光学与电子科技学院,浙江杭州 310018

杭州职业技术学院,浙江杭州 310018

杭州泽天春来科技有限公司,浙江杭州 310018

非相干宽带腔增强吸收光谱技术 超连续谱光源 甲烷浓度检测 矿井安全

国家自然科学基金青年基金浙江省重点研发计划杭州市科技发展计划

422051442022C03098202203B26

2024

10.3969/j.issn.2096-2835.2024.01.008

中国计量大学学报
中国计量学院

中国计量大学学报

CHSSCD
影响因子：0.357
ISSN：2096-2835
年,卷(期)：2024.35(1)
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