Investigation of diode laser-based multi-species gas sensor concepts

A concept of a gas analyzer based on linear Raman spectroscopy is presented . The radiation sources are laser systems emitting at visible or near infra red wavelengths. The advantages of Nd:YLF laser systems as well as diode la ser systems were investigated. The Raman technique offers the possibility t o measure the concentration of different molecules with the same laser wave length. As an example, the linear Raman scattering was used to measure the composition and to determine the energy content of natural gas.