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17 September 2020 Portable Raman dual-laser spectrometer for oil and gas
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Exploration of oil and gas by the geochemical method is somewhat underestimated. For its full disclosure, more modern and highly accurate methods of sample analysis are required. One of the promising methods is the Raman spectroscopy method. In this paper, we propose the concept of a portable Raman ultra-spectral resolution gas analyzer for recording low concentrations of hydrocarbons at a level of 2 ppm. The main idea is to use two radiation sources of 266 nm and 785 nm, with this configuration the total noise level is noticeably reduced, by comparing the data, Raman shifts of gases can be more accurately distinguished, an additional nitrogen channel is used for more accurate measurements in the system. The work shows a diagram of the optical channel, and the energy calculations performed show the possibility of detecting methane with a concentration of 2 ppm at a distance of one meter.
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Boris Y. Karas and Alexandr S. Grishkanich "Portable Raman dual-laser spectrometer for oil and gas", Proc. SPIE 11532, Environmental Effects on Light Propagation and Adaptive Systems III, 1153206 (17 September 2020);

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