In this work, we show a gas detection system based on fiber enhanced Raman spectroscopy intended to be used in rapid detection of gas mixtures.
Here, a photonic crystal fibre (HCPCF) is used for Raman enhancement. The HCPCF acts as a multi-pass cavity, increases the energy density and Raman scattering efficiency in the core. The band gap of the HCPCF used is centred around 800 nm. Furthermore, a solid state diode laser with an emission wavelength at 785 nm is used.
Measurements are made on atmospheric gases as well as CH4 and NH3 with varying fibre length, integration time and analyte concentration.
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