Compact Raman Spectroscopic Multicomponent Gas Sensing System With Anti-Resonant Hollow Fiber

The real-time monitoring and analysis of multicomponent gas have high potential applications in environmental monitoring and industrial production control. This article introduces a portable fiber-enhanced gas Raman sensing system equipped with a hollow-core anti-resonant fiber, which can significantly enhance the interaction strength between the pump light and the gas sample. The gas-filling device is designed to fill the hollow-core fiber with gas within ten seconds. By measuring the Raman spectra of common industrial gases, the analytical performance of the system for multicomponent gases is demonstrated. At the same time, the detection limit can be as low as sub 100 ppm level. The natural isotope ¹³ CO ₂ in the main components of ¹² CO ₂ can be measured. The promised linear relationship between Raman signal intensity and gas concentration enables the gas sensing device to monitor multicomponent gas concentrations dynamically.