TY - JOUR
T1 - Measurement of CO2 Isotopologue Ratios Using a Hollow Waveguide-Based Mid-Infrared Dispersion Spectrometer
AU - Zhang, Haojie
AU - Wu, Tao
AU - Wu, Qiang
AU - Chen, Weidong
AU - Ye, Chenwen
AU - Wang, Mengyu
AU - He, Xingdao
N1 - Funding information: The authors acknowledge the support of the National Natural Science Foundation of China (grant no. 42175130 and 61965013), the Key Program of Natural Science Foundation of Jiangxi Province, China (no. 20232ACB202002), the Training Funding Project of High-Level and High-Skill Leading Talent of Jiangxi Province, China, and the Graduate Student Innovation Foundation of Jiangxi Province, China (grant no. YC2022-S746).
PY - 2023/12/19
Y1 - 2023/12/19
N2 - We demonstrate for the first time the measurement of CO2 isotope ratios (13C/12C and 18O/16O) in a hollow waveguide (HWG) fiber using a mid-infrared heterodyne phase sensitive dispersion spectrometer (HPSDS). A 4.329 μm interband cascade laser (ICL) is used to target the absorption lines of three CO2 isotopes (13C16O2, 18O12C16O, and 12C16O2) in a 1 m long and 1mm inner diameter HWG fiber. The detection limits are 0.29 ppm, 65.78 ppb and 14.65 ppm with an integration time of 218 s for13C16O2, 18O12C16O, and 12C16O2, respectively, at a modulation frequency of 160 MHz and a pressure of 230 mbar. The measurement precisions of δ13C and δ18O are 0.89 ‰ and 0.88 ‰, respectively, corresponding to an integration time of 167 s. An experimental comparison between a HPSDS and a built wavelength modulation system with second-harmonic detection (WMS-2f) is conducted. The results show that compared to the WMS-2f, the developed HPSDS exhibits a greater linear dynamic range and excellent longterm stability. This work aims to demonstrate a detection technique of CO2 isotope dispersion spectroscopy with a large dynamic range for relevant applications focusing on samples with high concentrations of CO2 (% volume fraction), such as respiratory analysis in medical diagnostics.
AB - We demonstrate for the first time the measurement of CO2 isotope ratios (13C/12C and 18O/16O) in a hollow waveguide (HWG) fiber using a mid-infrared heterodyne phase sensitive dispersion spectrometer (HPSDS). A 4.329 μm interband cascade laser (ICL) is used to target the absorption lines of three CO2 isotopes (13C16O2, 18O12C16O, and 12C16O2) in a 1 m long and 1mm inner diameter HWG fiber. The detection limits are 0.29 ppm, 65.78 ppb and 14.65 ppm with an integration time of 218 s for13C16O2, 18O12C16O, and 12C16O2, respectively, at a modulation frequency of 160 MHz and a pressure of 230 mbar. The measurement precisions of δ13C and δ18O are 0.89 ‰ and 0.88 ‰, respectively, corresponding to an integration time of 167 s. An experimental comparison between a HPSDS and a built wavelength modulation system with second-harmonic detection (WMS-2f) is conducted. The results show that compared to the WMS-2f, the developed HPSDS exhibits a greater linear dynamic range and excellent longterm stability. This work aims to demonstrate a detection technique of CO2 isotope dispersion spectroscopy with a large dynamic range for relevant applications focusing on samples with high concentrations of CO2 (% volume fraction), such as respiratory analysis in medical diagnostics.
U2 - 10.1021/acs.analchem.3c03722
DO - 10.1021/acs.analchem.3c03722
M3 - Article
SN - 0003-2700
VL - 95
SP - 18479
EP - 18486
JO - Analytical Chemistry
JF - Analytical Chemistry
IS - 50
ER -