Design of Raman gas analysis system based on active resonant cavity

In order to detect and analyze the mixed gas, according to specific absorb spectrum peak of different kinds of gas in the mixed gas, based on the theory of laser resonant cavity enhanced spectroscopy and the technology of Raman scattering spectrum, and using active laser resonant cavity and avalanche photodiode, an online analysis system of the composition of the mixed gas was designed. Experimental results show that real time on-line detection of mixed gas can be realized and the mixed gas containing volume fraction of N₂ and O₂, respectively 0.502 and 0.498, can be detected effectively. The system is convenient, easy, safe, and reliable for operation. And the system can be used to detect the composition of the mixed gas.