摘要
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。
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.
作者
王禹涵
王坤阳
徐时清
张军杰
王世锋
郭杰
WANG Yuhan;WANG Kunyang;XU Shiqing;ZHANG Junjie;WANG Shifeng;GUO Jie(College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China;Hangzhou Vocational and Technical College,Hangzhou 310018,China;Hangzhou Chunlai Technology Co.,Ltd.,Hangzhou 310000,China)
出处
《中国计量大学学报》
2024年第1期53-57,128,共6页
Journal of China University of Metrology
基金
国家自然科学青年基金项目(No.42205144)
浙江省重点研发计划项目(No.2022C03098)
杭州市科技发展计划项目(No.202203B26)。
关键词
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
incoherent broadband cavity enhanced absorption spectroscopy(IBBCEAS)
supercontinuum light source
methane concentration detection
mine safety
