Multipass Raman gas analyzer for monitoring of atmospheric air composition

Natural Gas Analysis Using Polarized Raman Spectroscopy

“…For a long time, the use of this method for gas analysis was limited by the low level of useful signals. However, small-sized high-power lasers and highly sensitive photodetectors have now become available, and various techniques are being developed to increase the intensity of Raman signals. − In this regard, the detection limit of modern Raman gas analyzers is close to 1 ppm. ,,,, This level of sensitivity makes it possible to measure the composition of the gas in accordance with the requirements specified in ISO 6974. However, the Raman spectrum of NG is quite complex, and the bands of various components strongly overlap each other .…”

“…1−8 In this regard, the detection limit of modern Raman gas analyzers is close to 1 ppm. 1,2,4,9,10 This level of sensitivity makes it possible to measure the composition of the gas in accordance with the requirements specified in ISO 6974. However, the Raman spectrum of NG is quite complex, and the bands of various components strongly overlap each other.…”