中国计量大学学报2024，Vol.35Issue(1)：53-57,128,6.DOI:10.3969/j.issn.2096-2835.2024.01.008
基于不同宽带非相干光源的甲烷浓度测量研究
Study on methane concentration measurement based on various broadband incoherent light sources
摘要
Abstract
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.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Key words
incoherent broadband cavity enhanced absorption spectroscopy(IBBCEAS)/supercontinuum light source/methane concentration detection/mine safety分类
数理科学引用本文复制引用
王禹涵,王坤阳,徐时清,张军杰,王世锋,郭杰..基于不同宽带非相干光源的甲烷浓度测量研究[J].中国计量大学学报,2024,35(1):53-57,128,6.基金项目
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) （No.42205144）
