Determination of atmospheric carbon dioxide concentration using Raman spectroscopy

Application of Raman Spectroscopy for Determination of Syngas Composition

“…In addition, the contour fit method has higher accuracy compared to the method based on Raman peak area ratios calculation. 28 Thus, using all obtained spectra of syngas sample, its composition was determined using this method. For its implementation, a set of spectra of pure components (H 2 , CO, CO 2 , CH 4 , and N 2 ) recorded at a pressure of 25 bar was used.…”

Depolarization Ratio of the ν1 Raman Band of Pure CH4 and Perturbed by N2 and CO2

“…Other amplification methods include the multi-pass optical cells [ 1 , 2 , 3 , 4 ] or hollow-core fiber [ 5 , 6 , 7 , 8 ]. However, compression of the analyzed medium to a higher pressure is the most effective and easy to implement signal amplification approach [ 9 , 10 ]. Neglecting the compressibility factor, compression of the sample at ambient pressure to a pressure of 5 MPa leads to a 50-fold amplification [ 11 ].…”

“…The LOD below 1 ppm can be achieved using this approach. Such sensitivity opens up the possibility to analyze the composition of atmospheric and exhaled air using Raman spectroscopy [ 5 , 10 , 12 , 13 , 14 , 15 , 16 ]. This method is very promising due to its high measurement speed and the ability to determine a lot of compounds.…”

Features of Measuring Low CO Concentrations in N2-Containing Mixtures at Different Temperatures Using Spontaneous Raman Spectroscopy

“…Raman spectroscopy was successfully used to analyze the composition of multicomponent gas media such as natural gas, 1–7 breath air, 8–12 and atmospheric air. 8,11,13…”