Measurement of CO2 concentration based on supercon-tinuum laser absorption spectroscopy

• 作者: LI Hong-lian DI Shuai LI Wen-duo L(ü) Wen-jing WANG Fan FANG Li-de
• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Measurement Devices and Methods
• 页码范围: 176-182
• 页数: 7页
• 语种: 英文
• DOI: 10.1007/s11801-021-0099-1

摘要

The concentrations of CO2 were measured by the supercontinuum laser at normal temperature and variable tempera-ture accurately in this paper.The absorption spectra of CO2 at different concentrations(1.2％-9.0％)were measured in the wavelength range of 1 425-1 445 nm under the optical path of 26.4 m at 293 K and 1 atm.The experimental results showed that the positions of the primary and secondary absorption peaks(1 432 nm,1 437 nm)were consistent with the HITRAN database.A linear model of concentration and signal intensity at 1 432 nm was established.The maximum relative error of the concentration measurement was 3.3％.The line intensities of 99.9％CO2 in the 1 425-1 445 nm at different temperatures(298-373 K,interval of 15 K)were measured.The influence of tempera-ture changes on the concentration measurement result was corrected and the relative error of the concentration meas-urement was reduced to 1.4％.Finally,the source of the uncertainty of the entire spectrum measurement system was analyzed and evaluated.This paper demonstrate that the supercontinuum laser can achieve the long-distance meas-urement of the CO2 under normal temperature or variable temperature environment accurately,which provide an im-portant reference for the long-distance gas detection on site and simultaneous detection of multi-component gases.